\documentclass[11pt,twoside]{article}\makeatletter \IfFileExists{xcolor.sty}% {\RequirePackage{xcolor}}% {\RequirePackage{color}} \usepackage{colortbl} \usepackage{wrapfig} \usepackage{ifxetex} \ifxetex \usepackage{fontspec} \usepackage{xunicode} \catcode`⃥=\active \def⃥{\textbackslash} \catcode`❴=\active \def❴{\{} \catcode`❵=\active \def❵{\}} \def\textJapanese{\fontspec{Noto Sans CJK JP}} \def\textChinese{\fontspec{Noto Sans CJK SC}} \def\textKorean{\fontspec{Noto Sans CJK KR}} \setmonofont{DejaVu Sans Mono} \else \IfFileExists{utf8x.def}% {\usepackage[utf8x]{inputenc} \PrerenderUnicode{–} }% {\usepackage[utf8]{inputenc}} \usepackage[english]{babel} \usepackage[T1]{fontenc} \usepackage{float} \usepackage[]{ucs} \uc@dclc{8421}{default}{\textbackslash } \uc@dclc{10100}{default}{\{} \uc@dclc{10101}{default}{\}} \uc@dclc{8491}{default}{\AA{}} \uc@dclc{8239}{default}{\,} \uc@dclc{20154}{default}{ } \uc@dclc{10148}{default}{>} \def\textschwa{\rotatebox{-90}{e}} \def\textJapanese{} \def\textChinese{} \IfFileExists{tipa.sty}{\usepackage{tipa}}{} \fi \def\exampleFont{\ttfamily\small} \DeclareTextSymbol{\textpi}{OML}{25} \usepackage{relsize} \RequirePackage{array} \def\@testpach{\@chclass \ifnum \@lastchclass=6 \@ne \@chnum \@ne \else \ifnum \@lastchclass=7 5 \else \ifnum \@lastchclass=8 \tw@ \else \ifnum \@lastchclass=9 \thr@@ \else \z@ \ifnum \@lastchclass = 10 \else \edef\@nextchar{\expandafter\string\@nextchar}% \@chnum \if \@nextchar c\z@ \else \if \@nextchar l\@ne \else \if \@nextchar r\tw@ \else \z@ \@chclass \if\@nextchar |\@ne \else \if \@nextchar !6 \else \if \@nextchar @7 \else \if \@nextchar (8 \else \if \@nextchar )9 \else 10 \@chnum \if \@nextchar m\thr@@\else \if \@nextchar p4 \else \if \@nextchar b5 \else \z@ \@chclass \z@ \@preamerr \z@ \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi \fi} \gdef\arraybackslash{\let\\=\@arraycr} \def\@textsubscript#1{{\m@th\ensuremath{_{\mbox{\fontsize\sf@size\z@#1}}}}} \def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}} \def\abbr{} \def\corr{} \def\expan{} \def\gap{} \def\orig{} \def\reg{} \def\ref{} \def\sic{} \def\persName{}\def\name{} \def\placeName{} \def\orgName{} \def\textcal#1{{\fontspec{Lucida Calligraphy}#1}} \def\textgothic#1{{\fontspec{Lucida Blackletter}#1}} \def\textlarge#1{{\large #1}} \def\textoverbar#1{\ensuremath{\overline{#1}}} \def\textquoted#1{‘#1’} \def\textsmall#1{{\small #1}} \def\textsubscript#1{\@textsubscript{\selectfont#1}} \def\textxi{\ensuremath{\xi}} \def\titlem{\itshape} \newenvironment{biblfree}{}{\ifvmode\par\fi } \newenvironment{bibl}{}{} \newenvironment{byline}{\vskip6pt\itshape\fontsize{16pt}{18pt}\selectfont}{\par } \newenvironment{citbibl}{}{\ifvmode\par\fi } \newenvironment{docAuthor}{\ifvmode\vskip4pt\fontsize{16pt}{18pt}\selectfont\fi\itshape}{\ifvmode\par\fi } \newenvironment{docDate}{}{\ifvmode\par\fi } \newenvironment{docImprint}{\vskip 6pt}{\ifvmode\par\fi } \newenvironment{docTitle}{\vskip6pt\bfseries\fontsize{22pt}{25pt}\selectfont}{\par } \newenvironment{msHead}{\vskip 6pt}{\par} \newenvironment{msItem}{\vskip 6pt}{\par} \newenvironment{rubric}{}{} \newenvironment{titlePart}{}{\par } \newcolumntype{L}[1]{){\raggedright\arraybackslash}p{#1}} \newcolumntype{C}[1]{){\centering\arraybackslash}p{#1}} \newcolumntype{R}[1]{){\raggedleft\arraybackslash}p{#1}} \newcolumntype{P}[1]{){\arraybackslash}p{#1}} \newcolumntype{B}[1]{){\arraybackslash}b{#1}} \newcolumntype{M}[1]{){\arraybackslash}m{#1}} \definecolor{label}{gray}{0.75} \def\unusedattribute#1{\sout{\textcolor{label}{#1}}} \DeclareRobustCommand*{\xref}{\hyper@normalise\xref@} \def\xref@#1#2{\hyper@linkurl{#2}{#1}} \begingroup \catcode`\_=\active \gdef_#1{\ensuremath{\sb{\mathrm{#1}}}} \endgroup \mathcode`\_=\string"8000 \catcode`\_=12\relax \usepackage[a4paper,twoside,lmargin=1in,rmargin=1in,tmargin=1in,bmargin=1in,marginparwidth=0.75in]{geometry} \usepackage{framed} \definecolor{shadecolor}{gray}{0.95} \usepackage{longtable} \usepackage[normalem]{ulem} \usepackage{fancyvrb} \usepackage{fancyhdr} \usepackage{graphicx} \usepackage{marginnote} \renewcommand{\@cite}[1]{#1} \renewcommand*{\marginfont}{\itshape\footnotesize} \def\Gin@extensions{.pdf,.png,.jpg,.mps,.tif} \pagestyle{fancy} \usepackage[pdftitle={A Combination of Data Augmentation Techniques for Mango Leaf Diseases Classification}, pdfauthor={}]{hyperref} \hyperbaseurl{} \paperwidth210mm \paperheight297mm \def\@pnumwidth{1.55em} \def\@tocrmarg {2.55em} \def\@dotsep{4.5} \setcounter{tocdepth}{3} \clubpenalty=8000 \emergencystretch 3em \hbadness=4000 \hyphenpenalty=400 \pretolerance=750 \tolerance=2000 \vbadness=4000 \widowpenalty=10000 \renewcommand\section{\@startsection {section}{1}{\z@}% {-1.75ex \@plus -0.5ex \@minus -.2ex}% {0.5ex \@plus .2ex}% {\reset@font\Large\bfseries}} \renewcommand\subsection{\@startsection{subsection}{2}{\z@}% {-1.75ex\@plus -0.5ex \@minus- .2ex}% {0.5ex \@plus .2ex}% {\reset@font\Large}} \renewcommand\subsubsection{\@startsection{subsubsection}{3}{\z@}% {-1.5ex\@plus -0.35ex \@minus -.2ex}% {0.5ex \@plus .2ex}% {\reset@font\large}} \renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}% {-1ex \@plus-0.35ex \@minus -0.2ex}% {0.5ex \@plus .2ex}% {\reset@font\normalsize}} \renewcommand\subparagraph{\@startsection{subparagraph}{5}{\parindent}% {1.5ex \@plus1ex \@minus .2ex}% {-1em}% {\reset@font\normalsize\bfseries}} \def\l@section#1#2{\addpenalty{\@secpenalty} \addvspace{1.0em plus 1pt} \@tempdima 1.5em \begingroup \parindent \z@ \rightskip \@pnumwidth \parfillskip -\@pnumwidth \bfseries \leavevmode #1\hfil \hbox to\@pnumwidth{\hss #2}\par \endgroup} \def\l@subsection{\@dottedtocline{2}{1.5em}{2.3em}} \def\l@subsubsection{\@dottedtocline{3}{3.8em}{3.2em}} \def\l@paragraph{\@dottedtocline{4}{7.0em}{4.1em}} \def\l@subparagraph{\@dottedtocline{5}{10em}{5em}} \@ifundefined{c@section}{\newcounter{section}}{} \@ifundefined{c@chapter}{\newcounter{chapter}}{} \newif\if@mainmatter \@mainmattertrue \def\chaptername{Chapter} \def\frontmatter{% \pagenumbering{roman} \def\thechapter{\@roman\c@chapter} \def\theHchapter{\roman{chapter}} \def\thesection{\@roman\c@section} \def\theHsection{\roman{section}} \def\@chapapp{}% } \def\mainmatter{% \cleardoublepage \def\thechapter{\@arabic\c@chapter} \setcounter{chapter}{0} \setcounter{section}{0} \pagenumbering{arabic} \setcounter{secnumdepth}{6} \def\@chapapp{\chaptername}% \def\theHchapter{\arabic{chapter}} \def\thesection{\@arabic\c@section} \def\theHsection{\arabic{section}} } \def\backmatter{% \cleardoublepage \setcounter{chapter}{0} \setcounter{section}{0} \setcounter{secnumdepth}{2} \def\@chapapp{\appendixname}% \def\thechapter{\@Alph\c@chapter} \def\theHchapter{\Alph{chapter}} \appendix } \newenvironment{bibitemlist}[1]{% \list{\@biblabel{\@arabic\c@enumiv}}% {\settowidth\labelwidth{\@biblabel{#1}}% \leftmargin\labelwidth \advance\leftmargin\labelsep \@openbib@code \usecounter{enumiv}% \let\p@enumiv\@empty \renewcommand\theenumiv{\@arabic\c@enumiv}% }% \sloppy \clubpenalty4000 \@clubpenalty \clubpenalty \widowpenalty4000% \sfcode`\.\@m}% {\def\@noitemerr {\@latex@warning{Empty `bibitemlist' environment}}% \endlist} \def\tableofcontents{\section*{\contentsname}\@starttoc{toc}} \parskip0pt \parindent1em \def\Panel#1#2#3#4{\multicolumn{#3}{){\columncolor{#2}}#4}{#1}} \newenvironment{reflist}{% \begin{raggedright}\begin{list}{} {% \setlength{\topsep}{0pt}% \setlength{\rightmargin}{0.25in}% \setlength{\itemsep}{0pt}% \setlength{\itemindent}{0pt}% \setlength{\parskip}{0pt}% \setlength{\parsep}{2pt}% \def\makelabel##1{\itshape ##1}}% } {\end{list}\end{raggedright}} \newenvironment{sansreflist}{% \begin{raggedright}\begin{list}{} {% \setlength{\topsep}{0pt}% \setlength{\rightmargin}{0.25in}% \setlength{\itemindent}{0pt}% \setlength{\parskip}{0pt}% \setlength{\itemsep}{0pt}% \setlength{\parsep}{2pt}% \def\makelabel##1{\upshape ##1}}% } {\end{list}\end{raggedright}} \newenvironment{specHead}[2]% {\vspace{20pt}\hrule\vspace{10pt}% \phantomsection\label{#1}\markright{#2}% \pdfbookmark[2]{#2}{#1}% \hspace{-0.75in}{\bfseries\fontsize{16pt}{18pt}\selectfont#2}% }{} \def\TheFullDate{1970-01-01 (revised: 01 January 1970)} \def\TheID{\makeatother } \def\TheDate{1970-01-01} \title{A Combination of Data Augmentation Techniques for Mango Leaf Diseases Classification} \author{}\makeatletter \makeatletter \newcommand*{\cleartoleftpage}{% \clearpage \if@twoside \ifodd\c@page \hbox{}\newpage \if@twocolumn \hbox{}\newpage \fi \fi \fi } \makeatother \makeatletter \thispagestyle{empty} \markright{\@title}\markboth{\@title}{\@author} \renewcommand\small{\@setfontsize\small{9pt}{11pt}\abovedisplayskip 8.5\p@ plus3\p@ minus4\p@ \belowdisplayskip \abovedisplayskip \abovedisplayshortskip \z@ plus2\p@ \belowdisplayshortskip 4\p@ plus2\p@ minus2\p@ \def\@listi{\leftmargin\leftmargini \topsep 2\p@ plus1\p@ minus1\p@ \parsep 2\p@ plus\p@ minus\p@ \itemsep 1pt} } \makeatother \fvset{frame=single,numberblanklines=false,xleftmargin=5mm,xrightmargin=5mm} \fancyhf{} \setlength{\headheight}{14pt} \fancyhead[LE]{\bfseries\leftmark} \fancyhead[RO]{\bfseries\rightmark} \fancyfoot[RO]{} \fancyfoot[CO]{\thepage} \fancyfoot[LO]{\TheID} \fancyfoot[LE]{} \fancyfoot[CE]{\thepage} \fancyfoot[RE]{\TheID} \hypersetup{citebordercolor=0.75 0.75 0.75,linkbordercolor=0.75 0.75 0.75,urlbordercolor=0.75 0.75 0.75,bookmarksnumbered=true} \fancypagestyle{plain}{\fancyhead{}\renewcommand{\headrulewidth}{0pt}} \date{} \usepackage{authblk} \providecommand{\keywords}[1] { \footnotesize \textbf{\textit{Index terms---}} #1 } \usepackage{graphicx,xcolor} \definecolor{GJBlue}{HTML}{273B81} \definecolor{GJLightBlue}{HTML}{0A9DD9} \definecolor{GJMediumGrey}{HTML}{6D6E70} \definecolor{GJLightGrey}{HTML}{929497} \renewenvironment{abstract}{% \setlength{\parindent}{0pt}\raggedright \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt \textcolor{GJBlue}{\large\bfseries\abstractname\space} }{% \vskip8pt \textcolor{GJMediumGrey}{\rule{\textwidth}{2pt}} \vskip16pt } \usepackage[absolute,overlay]{textpos} \makeatother \usepackage{lineno} \linenumbers \begin{document} \author[1]{Demba Faye} \author[2]{Idy Diop} \author[3]{Doudou Dione} \affil[1]{ University Cheikh Anta DIOD of Dakar, Senegal} \renewcommand\Authands{ and } \date{\small \em Received: 1 January 1970 Accepted: 1 January 1970 Published: 1 January 1970} \maketitle \begin{abstract} Mango is one of the most traded fruits in the world. Therefore, mango production suffers from several pests and diseases which reduce the production and quality of mangoes and their price in the local and international markets. Several solutions for automatic diagnosis of these pests and diseases have been proposed by researchers in the last decade. These solutions are based on Machine Learning (ML) and Deep Learning (DL) algorithms. In recent years, Convolutional Neural Networks (CNNs) have achieved impressive results in image classification and are considered as the leading methods for image classification. \end{abstract} \keywords{data augmentation, mango, disease, classification, deep learning, resnet50.} \begin{textblock*}{18cm}(1cm,1cm) % {block width} (coords) \textcolor{GJBlue}{\LARGE Global Journals \LaTeX\ JournalKaleidoscope\texttrademark} \end{textblock*} \begin{textblock*}{18cm}(1.4cm,1.5cm) % {block width} (coords) \textcolor{GJBlue}{\footnotesize \\ Artificial Intelligence formulated this projection for compatibility purposes from the original article published at Global Journals. However, this technology is currently in beta. \emph{Therefore, kindly ignore odd layouts, missed formulae, text, tables, or figures.}} \end{textblock*} \begin{textblock*}{10cm}(1.05cm,3cm) {{\textit{CrossRef DOI of original article:}} \underline{}} \end{textblock*}\let\tabcellsep& \par Abstract-Mango is one of the most traded fruits in the world.\par Therefore, mango production suffers from several pests and diseases which reduce the production and quality of mangoes and their price in the local and international markets. Several solutions for automatic diagnosis of these pests and diseases have been proposed by researchers in the last decade. These solutions are based on Machine Learning (ML) and Deep Learning (DL) algorithms. In recent years, Convolutional Neural Networks (CNNs) have achieved impressive results in image classification and are considered as the leading methods for image classification. However, one of the most significant issues facing mango pests and diseases classification solutions is the lack of availability of large and labeled datasets. Data augmentation is one of solutions that has been successfully reported in the literature. This paper deals with data augmentation techniques namely blur, contrast, flip, noise, zoom and affine transformation to know, on the one hand, the impact of each technique on the performance of a ResNet50 CNN using an initial small dataset, on the other hand, the combination between them which gives the best performance to the DL network. Results show that the best combination classifying mango leaf diseases is 'Contrast \& Flip \& Affine transformation' which gives to the model a training accuracy of 98.54\% and testing accuracy of 97.80\% with an f1\textunderscore score > 0.9.\par Keywords: data augmentation, mango, disease, classification, deep learning, resnet50. \section[{I. introduction}]{I. introduction}\par ango or Magnifera Indica L. (scientific name) is a lucrative fruit widely cultivated in tropical countries. It belongs to the family anacardiaceous. Its overall consumption in 2017 was estimated at 50.65 million metric tons \hyperref[b0]{[1]}. This fruit was in 2021, in terms of quantities exported, the third most traded tropical fruit after pineapple and avocado \hyperref[b1]{[2]}. Mango fruit is very appreciated because of its richness in nutrients (vitamins A, B, C, K, ...), flavorful pulp and alluring aroma \hyperref[b3]{[3,}\hyperref[b4]{4]}. This fruit contributes enormous economic benefits to exporting countries and mango growers.\par However, mango production suffers severely from pests and diseases witch lead to a reduction of both quality and quantity. This influence mango price in the international market.\par In the last decade, several solutions for automatic diagnosis of these pests and diseases have been proposed by researchers. These solutions are first based on image processing (IP) and machine learning (ML) techniques and finally, in the last five years, on deep learning (DL) algorithms DL based solutions have achieved state-of-the-art performance on Image Net and other benchmark datasets \hyperref[b5]{[5]}. In recent years, Convolutional Neural Networks (CNNs) have achieved impressive results in image classification and are considered as the leading methods for object detection in computer vision \hyperref[b5]{[5,}\hyperref[b6]{6]}.\par However, one of the biggest issues facing mango pests and diseases identification solutions is the lack of availability of large and labeled datasets \hyperref[b7]{[7,}\hyperref[b8]{8,}\hyperref[b9]{9,}\hyperref[b10]{10]}. The limited training data inhibits performance of DL based models which need big data on which to train well to avoid overfitting and improves the model's generalization ability. Overfitting happens when the training accuracy is higher than the accuracy on the validation/test set. The generalizability of a model is the difference in performance it exhibits when evaluated on training data (known data) versus test data (unknown data). The use of data augmentation process is one of solutions that has been successfully reported in the literature \hyperref[b0]{[1]}. This overfitting solution generates a more comprehensive set that minimizes the distance between training and validation sets.\par A data augmentation process based on image manipulation is presented in this paper for improving the quality of a small dataset of mango leaves presented in \hyperref[b0]{[1]}. The specific contributions of the paper include:\par ? Generate a dataset for every data augmentation strategy except affine transformation. The DL model is trained in each generated dataset to know the impact of each data augmentation technique in the performance of the model. The rest of the paper is organized as follows: Section 2 is an overview of the literature review, Section 3 deals with the data acquisition and data augmentation techniques and the CNN model used, Section 4 presents and discusses the results of the data augmentation techniques. The last section concludes the paper and announces the futures works of the authors.\par II. \section[{Ralated Works}]{Ralated Works}\par The literature review presented in this paper concerns only data augmentation strategies used for ango pest or diseases classification and mango or other fruits quality grading.\par Shorten et al. \hyperref[b11]{[11]} presented a survey dealing with image data augmentation algorithms such as color space augmentations, geometric transformations, mixing images, kernel filters, random erasing, adversarial training, feature space augmentation, generative adversarial networks (GAN), meta-learning and neural style transfer. They also discussed the application of augmentation methods based on GANs and others characteristics of data augmentation such as curriculum learning, test-time augmentation, resolution impact, and final dataset size. Dandavate et al. \hyperref[b12]{[12]} applied data augmentation techniques namely rotation, scaling and image translation to a fruit dataset to avoid overfitting and obtain better performances with their simple CNN model. Agastya et al. \hyperref[b13]{[13]} used VGG-16 and VGG-19 for an automatic batik classification. Applying random rotation in a certain degree, scaling and shearing, they improve the accuracy of their models up to 10\%. Bargoti et al. \hyperref[b14]{[14]} presented a fruit (mangoes, apples, and almonds) detection system using Faster R-CNN. They used image flipping and scaling to improve the performance of their model with an F1-score of > 0,9 achieved for mangoes and apples. Wu et al. \hyperref[b15]{[15]} investigated several deep learning-based methods for mango quality grading. VGG-16 is found to be the best model for this task. During the training of their models, authors applied, at each epoch, randomly data augmentation strategies such as horizontal or vertical image flipping, rotation, brightness, contrast and zoom in/out. Zang et al. \hyperref[b16]{[16]} developed a fruit category identification by using a 13-layer CNN and three data augmentation strategies namely noise injection, image rotation and Gamma correction. The final obtained overall accuracy is 94.94\%, at least 5 percentage points higher than state-of-the-art approaches. Supekar et al. \hyperref[b17]{[17]} performed a mango grading system based on ripeness, size, shape and defects. They used K-means clustering for defect segmentation and Random Forest Classifiers. To avoid overfitting with an initial training dataset of 69 images, authors applied image rotation on angle of 90,180 and 270. The final training dataset obtained consists of 522 images which allows their model to obtain an overall accuracy of 88,88\%. \section[{III.}]{III.} \section[{Methodology and Model a) Data aquisition}]{Methodology and Model a) Data aquisition}\par The dataset used in this paper is a part of 'MangoLeafBD' dataset produced by Ahmed et al. \hyperref[b18]{[18]} and downloadable from 'Mendeley Data'' platform (https://data.mendeley.com/datasets/hxsnvwty3r).\par MangoLeafBD dataset contains height classes, seven of which correspond to mango leaf diseases and one contains healthy leaves.\par In this paper, four diseases namely anthracnose, Gall Midge, Powdery Mildew and Sooty Mold are treated as they are among the most mango leaf diseases treated by researchers during the last five years \hyperref[b19]{[19]} (Fig. {\ref 1andFig}.2). The dataset used contains four classes corresponding respectively to these diseases and a class of healthy leaves. There are 500 RGB leaf images of 240x320 pixels in each class making a total of 2,500. Images are in JPG format. \section[{b) Data augmentation}]{b) Data augmentation}\par Data augmentation is a powerful solution against overfitting. It allows a model with a small dataset to become robust and generalizable. There are two categories of data augmentation: the first is based on image manipulations and the second on DL (generative adversarial networks (GANs), feature space augmentations, adversarial training, Neural Style Transfer, Meta Learning Data Augmentation) \hyperref[b11]{[11]}.\par This research focuses on the first category because i) the second is generally used to generate synthetics images from quite a large dataset, ii) mango leaf images taken under real-world conditions suffer mainly from the problems of temperature variation, shadowing, overlapping of leaves, and presence of multiple objects. The first category can allow us to generate images in these cases. \section[{This papers deals with following techniques:}]{This papers deals with following techniques:}\par ? Noise injection Image noise is a random disturbance in the brightness and color of an image. Noise injection is an effective way to avoid overfitting and improves the test ability of a machine learning model \hyperref[b13]{[13]}. There are several ways to add noise to an image (e.g. Gaussian noise, Salt and Pepper noise, Speckle noise, ?). Gaussian noise is performed fixing mean parameter to 0 and sigma parameter to 0.05. \section[{? Blur}]{? Blur}\par Blurring an image means make it less sharp. Photographic blur occurs with movement in the model or scene relative to the camera, and vice versa. To realize this, Gaussian blur was carried out using a kernel size \hyperref[b5]{(5,}\hyperref[b15]{15)}. \section[{? Contrast and Brightness}]{? Contrast and Brightness}\par The Contrast and Brightness function improves the appearance of an image. Brightness improves the overall clarity of the image and contrast adjusts the difference between the darkest and lightest colors. Contrast parameters used are \{0.5;2;2.5\} and brightness parameters are \{1;4;5\}. For each original image, three new images are generated with respectively the following parameters contracts, brightness \{c; b\}: \{0.5; 1\}, \{2; 4\}, \{2.5; 5\}. \section[{? Zoom}]{? Zoom}\par Zooming an image means enlarging it in a sense that the details in the picture became more visible and clear. Each image is zoomed three times and from the center using zoom parameters \{3;5;7\}. \section[{? Image flipping}]{? Image flipping}\par To flip or mirror an image means to turn it horizontally (horizontal flip) or vertically (vertical flip). Flip function generates an image so that the left side becomes the right side or the top becomes the bottom. The images are vertically and horizontally flipped using flip parameter 0 and 1 respectively. \section[{? Affine transformation}]{? Affine transformation}\par An affine transformation is, in general a combination of translations, rotations, shears and dilations \hyperref[b12]{[12]}. It s used to simulate images captured from different camera projections nd positions. Affine transformation is performed using an input matrix (In) of size 2x3 and an output matrix (Out) of the same size. The input matrix corresponds to three points in the input image and the second matrix is their corresponding locations in the output image. In the training dataset, twenty additional images are randomly generated for each image. But after that, the generated images on which there is no part of mango leaf are removed.\par Fig. {\ref 3} shows an example of a diseased mango leaf (anthracnose) on which all these data augmentation techniques are applied. \section[{Number of times Mango Diseases}]{Number of times Mango Diseases}\par The data augmentation process (Fig. {\ref 4}) is carried out as follow:\par First step: For each of the above mentioned data augmentation strategies (except affine transformation), a new dataset for training and validation is generated (Fig. {\ref 3}, Table \hyperref[tab_2]{2}). Images of the original dataset are added to the generated one. This is to know the impact of each data augmentation strategy on the overall performance of the model. \section[{Second step:}]{Second step:}\par Every strategy (except affine transformation) is combined respectively by the 4 others sequentially to generate new datasets (Table \hyperref[tab_2]{2}).\par Final step: Affine transformation is applied to the best combination that gives the best performance to the DL model (Table \hyperref[tab_3]{3}).\par The augmentation techniques are carried out using python Open Source Computer Vision Library (OpenCV). \hyperref[b20]{[20]}. ResNet won the first place at the ImageNet Large Scale Visual Recognition Challenge (ILSVRC 2015). To preserve knowledge, reduce losses and boost performance during the training phase, ResNet introduced residual connections between layers. A residual connection in a layer means that the output of a layer is convolution of its input plus its input \hyperref[b21]{[21]}. ReNet50 is used in this research. It consists of 50 layers as it is shown by the Fig. \hyperref[fig_4]{5}.\par The model is updated by replacing the number (1000) of nodes of the softmax output layer by 5 (corresponding to the number of treated mango leaf diseases). \section[{d) Implementation details}]{d) Implementation details}\par The data augmentation process and ResNet50 model are all carried out using respectively, OpenCV and Keras labreries. Model's training parameters used include Adam optimizer with a learning rate of 0.001, binary cross-entropy (loss function) and epochs of 8.\par The model is trained on a server with an NVIDIA GPU and 32 GB of RAM.\par IV. \section[{Result and Discussion}]{Result and Discussion}\par The initial small dataset is splitted as follow: 64\% for training, 16\% for validation and 20\% for testing. After randomly splitting the dataset, we have 1,600 images for training, 400 images for validation and 500 images for testing. Results sho that the training accuracy (87.18\%) is greater than the testing accuracy (39.34\%). So the model overfitted as it is shown by the Fig. \hyperref[fig_6]{6}. Since the dataset is not enough to train robustly the DL model, data augmentation process is carried out. This ask concerns only training and validation data \hyperref[b22]{[22]}. Test data remains equal to 500 images.\par In the first step, after training phase, results show that the DL model overfits on all datasets except 'Original \& Contrast' which gives a training and testing accuracy of 90.56\% and 86.23\% respectively (Table \hyperref[tab_3]{3}, Fig. \hyperref[fig_7]{7}).\par In the second step, training the model on the combined datasets yielded the results in Table \hyperref[tab_4]{4} Finally, affine transformation strategy is applied to 'Contrast \& Flip' and 'Flip\textunderscore Zoom' datasets. Results show that 'Contrast \& Flip' gives the best performances with an accuracy of 97.80\% and a f1\textunderscore score> 0.9 (Table \hyperref[tab_5]{5}, Fig. \hyperref[fig_8]{8}, Fig. \hyperref[fig_9]{9}). This solution can be used to improve the performance of DL models for image classification with small datasets.\par Our future work, is to propose a dataset of mango leaf diseases with images captured in mango orchards of a sahelian country like Senegal. Applying this combination as a data augmentation technique to this dataset will allow us to achieve excellent results in mango leaf disease classification using a deep learning model such as ResNet50. Then, this model will be deployed in mobile and web applications to allow mango growers to diagnose diseases in their crops without expert intervention.\begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-2.png} \caption{\label{fig_0}A}\end{figure} \begin{figure}[htbp] \noindent\textbf{12}\includegraphics[]{image-3.png} \caption{\label{fig_1}Fig. 1 :Fig. 2 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-4.png} \caption{\label{fig_2}(}\end{figure} \begin{figure}[htbp] \noindent\textbf{34}\includegraphics[]{image-5.png} \caption{\label{fig_3}Fig. 3 :Fig. 4 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{5}\includegraphics[]{image-6.png} \caption{\label{fig_4}Fig. 5 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{}\includegraphics[]{image-7.png} \caption{\label{fig_5}}\end{figure} \begin{figure}[htbp] \noindent\textbf{6}\includegraphics[]{image-8.png} \caption{\label{fig_6}Fig. 6 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{7}\includegraphics[]{image-9.png} \caption{\label{fig_7}Fig. 7 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{8}\includegraphics[]{image-10.png} \caption{\label{fig_8}Fig. 8 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{9}\includegraphics[]{image-11.png} \caption{\label{fig_9}Fig. 9 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{1} \par \begin{longtable}{P{0.09999999999999999\textwidth}P{0.09166666666666667\textwidth}P{0.125\textwidth}P{0.14583333333333334\textwidth}P{0.12916666666666665\textwidth}P{0.12916666666666665\textwidth}P{0.12916666666666665\textwidth}} \tabcellsep Original\tabcellsep Original \& Blur\tabcellsep Original \& Contrast\tabcellsep Original \& Flip\tabcellsep Original \& Noise\tabcellsep Original \& Zoom\\ Train\tabcellsep 1600\tabcellsep 3200\tabcellsep 6400\tabcellsep 4800\tabcellsep 3200\tabcellsep 6400\\ Validation\tabcellsep 400\tabcellsep 800\tabcellsep 1600\tabcellsep 1200\tabcellsep 800\tabcellsep 1600\\ Test\tabcellsep 500\tabcellsep 500\tabcellsep 500\tabcellsep 500\tabcellsep 500\tabcellsep 500\\ Total\tabcellsep 2500\tabcellsep 4500\tabcellsep 8500\tabcellsep 6500\tabcellsep 4500\tabcellsep 8500\end{longtable} \par \caption{\label{tab_1}Table 1 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{2} \par \begin{longtable}{P{0.06002824858757062\textwidth}P{0.05522598870056497\textwidth}P{0.019209039548022597\textwidth}P{0.09844632768361582\textwidth}P{0.05282485875706215\textwidth}P{0.012005649717514125\textwidth}P{0.0576271186440678\textwidth}P{0.03841807909604519\textwidth}P{0.06483050847457628\textwidth}P{0.009604519774011298\textwidth}P{0.06483050847457628\textwidth}P{0.012005649717514125\textwidth}P{0.09844632768361582\textwidth}P{0.009604519774011298\textwidth}P{0.05282485875706215\textwidth}P{0.012005649717514125\textwidth}P{0.05522598870056497\textwidth}P{0.009604519774011298\textwidth}P{0.0576271186440678\textwidth}P{0.009604519774011298\textwidth}} \tabcellsep Blur \&\tabcellsep Contrast\tabcellsep Blur \& Flip\tabcellsep Blur \&\tabcellsep Noise\tabcellsep Blur \&\tabcellsep Zoom\tabcellsep Contrast \&\tabcellsep Flip\tabcellsep Contrast \&\tabcellsep Noise\tabcellsep Contrast \&\tabcellsep Zoom\tabcellsep Flip \&\tabcellsep Noise\tabcellsep Flip \&\tabcellsep Zoom\tabcellsep Noise \&\tabcellsep Zoom\\ Train\tabcellsep \multicolumn{2}{l}{8000}\tabcellsep 6400\tabcellsep \multicolumn{2}{l}{4800}\tabcellsep \multicolumn{2}{l}{8000}\tabcellsep \multicolumn{2}{l}{9600}\tabcellsep \multicolumn{2}{l}{8000}\tabcellsep \multicolumn{2}{l}{11200}\tabcellsep \multicolumn{2}{l}{6400}\tabcellsep \multicolumn{2}{l}{9600}\tabcellsep \multicolumn{2}{l}{8000}\\ Validatio n\tabcellsep \multicolumn{2}{l}{2000}\tabcellsep 1600\tabcellsep \multicolumn{2}{l}{1200}\tabcellsep \multicolumn{2}{l}{2 000}\tabcellsep \multicolumn{2}{l}{2400}\tabcellsep \multicolumn{2}{l}{2000}\tabcellsep \multicolumn{2}{l}{2800}\tabcellsep \multicolumn{2}{l}{1600}\tabcellsep \multicolumn{2}{l}{2400}\tabcellsep \multicolumn{2}{l}{2000}\\ Test\tabcellsep \multicolumn{2}{l}{500}\tabcellsep 500\tabcellsep \multicolumn{2}{l}{500}\tabcellsep \multicolumn{2}{l}{500}\tabcellsep \multicolumn{2}{l}{500}\tabcellsep \multicolumn{2}{l}{500}\tabcellsep \multicolumn{2}{l}{500}\tabcellsep \multicolumn{2}{l}{500}\tabcellsep \multicolumn{2}{l}{500}\tabcellsep \multicolumn{2}{l}{500}\\ Total\tabcellsep \multicolumn{2}{l}{10500}\tabcellsep 8500\tabcellsep \multicolumn{2}{l}{6500}\tabcellsep \multicolumn{2}{l}{10500}\tabcellsep \multicolumn{2}{l}{12500}\tabcellsep \multicolumn{2}{l}{10500}\tabcellsep \multicolumn{2}{l}{14500}\tabcellsep \multicolumn{2}{l}{8500}\tabcellsep \multicolumn{2}{l}{12500}\tabcellsep \multicolumn{2}{l}{10500}\\ \tabcellsep \tabcellsep \tabcellsep \multicolumn{2}{l}{Original image}\tabcellsep \tabcellsep \tabcellsep \multicolumn{3}{l}{Noised image}\tabcellsep \tabcellsep \tabcellsep \multicolumn{4}{l}{Blurred image}\tabcellsep \tabcellsep \tabcellsep \end{longtable} \par \caption{\label{tab_2}Table 2 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{3} \par \begin{longtable}{P{0.18348017621145374\textwidth}P{0.13480176211453745\textwidth}P{0.11607929515418502\textwidth}P{0.22466960352422907\textwidth}P{0.0973568281938326\textwidth}P{0.0936123348017621\textwidth}} \tabcellsep Original \&\tabcellsep Original \&\tabcellsep Original \&\tabcellsep Original \&\tabcellsep Original \&\\ \tabcellsep Blur\tabcellsep Contrast\tabcellsep Flip\tabcellsep Noise\tabcellsep Zoom\\ Training Accuracy (\%)\tabcellsep 98.25\tabcellsep 90.56\tabcellsep 95.35\tabcellsep 76.36\tabcellsep 92.76\\ Testing Accuracy (\%)\tabcellsep 84.21\tabcellsep 86.23\tabcellsep 80.60\tabcellsep 34.84\tabcellsep 84.80\\ Result\tabcellsep overfitting\tabcellsep ok\tabcellsep \multicolumn{3}{l}{overfitting overfitting overfitting}\end{longtable} \par \caption{\label{tab_3}Table 3 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{4} \par \begin{longtable}{P{0.034552845528455285\textwidth}P{0.05067750677506775\textwidth}P{0.018428184281842817\textwidth}P{0.06449864498644986\textwidth}P{0.018428184281842817\textwidth}P{0.07601626016260163\textwidth}P{0.06449864498644986\textwidth}P{0.011517615176151762\textwidth}P{0.06449864498644986\textwidth}P{0.009214092140921408\textwidth}P{0.0529810298102981\textwidth}P{0.009214092140921408\textwidth}P{0.07371273712737127\textwidth}P{0.011517615176151762\textwidth}P{0.07371273712737127\textwidth}P{0.009214092140921408\textwidth}P{0.06680216802168021\textwidth}P{0.011517615176151762\textwidth}P{0.04376693766937669\textwidth}P{0.009214092140921408\textwidth}P{0.06680216802168021\textwidth}P{0.009214092140921408\textwidth}} \tabcellsep \tabcellsep \tabcellsep Blur \&\tabcellsep Contrast\tabcellsep Blur \& Flip\tabcellsep Blur \&\tabcellsep Noise\tabcellsep Blur \&\tabcellsep Zoom\tabcellsep Contrast \&\tabcellsep Flip\tabcellsep Contrast \&\tabcellsep Noise\tabcellsep Contrast \&\tabcellsep Zoom\tabcellsep Flip \&\tabcellsep Noise\tabcellsep Flip \&\tabcellsep Zoom\tabcellsep Noise \&\tabcellsep Zoom\\ Training\tabcellsep Accuracy\tabcellsep (\%)\tabcellsep \multicolumn{2}{l}{87.28}\tabcellsep 94.14\tabcellsep \multicolumn{2}{l}{78.29}\tabcellsep \multicolumn{2}{l}{92.08}\tabcellsep \multicolumn{2}{l}{95.29}\tabcellsep \multicolumn{2}{l}{84.25}\tabcellsep \multicolumn{2}{l}{88.71}\tabcellsep \multicolumn{2}{l}{78.80}\tabcellsep \multicolumn{2}{l}{93.15}\tabcellsep 82.48\\ Testing\tabcellsep Accuracy\tabcellsep (\%)\tabcellsep \multicolumn{2}{l}{65.45}\tabcellsep 85.30\tabcellsep \multicolumn{2}{l}{63.32}\tabcellsep \multicolumn{2}{l}{65.82}\tabcellsep \multicolumn{2}{l}{91.39}\tabcellsep \multicolumn{2}{l}{31.74}\tabcellsep \multicolumn{2}{l}{58.23}\tabcellsep \multicolumn{2}{l}{645.85}\tabcellsep \multicolumn{2}{l}{90.59}\tabcellsep 78.47\\ \tabcellsep Result\tabcellsep \tabcellsep \multicolumn{2}{l}{overfitting}\tabcellsep overfitting\tabcellsep \multicolumn{2}{l}{overfitting}\tabcellsep \multicolumn{2}{l}{overfitting}\tabcellsep \multicolumn{2}{l}{ok}\tabcellsep \multicolumn{2}{l}{overfitting}\tabcellsep \multicolumn{2}{l}{overfitting}\tabcellsep \multicolumn{2}{l}{overfitting}\tabcellsep \multicolumn{2}{l}{ok}\tabcellsep overfitting\end{longtable} \par \caption{\label{tab_4}Table 4 :}\end{figure} \begin{figure}[htbp] \noindent\textbf{5} \par \begin{longtable}{P{0.4161458333333333\textwidth}P{0.20807291666666666\textwidth}P{0.22578125\textwidth}} \tabcellsep Original \& Blur\tabcellsep Original \& Contrast\\ Training dataset\tabcellsep 50 056\tabcellsep 51 315\\ Validation dataset\tabcellsep 12 514\tabcellsep 12 828\\ Test dataset\tabcellsep 500\tabcellsep 500\\ Total\tabcellsep 63 070\tabcellsep 64 643\\ Training Accuracy (\%)\tabcellsep 98.54\tabcellsep 97.44\\ Testing Accuracy (\%)\tabcellsep 97.80\tabcellsep 93.98\end{longtable} \par \caption{\label{tab_5}Table 5 :}\end{figure} \footnote{© 2023 Global Journals} \footnote{( )Year 2023} \footnote{( )Year 2023} \backmatter \subsection[{Acknowledgements}]{Acknowledgements}\par The authors would like to thank IRD (Institut de Recherche pour le Développement) SENEGAL for access to their server which was used in this study. \begin{bibitemlist}{1} \bibitem[]{b2}\label{b2} \textit{}, \xref{http://dx.doi.org/10.1063/1.5124649}{10.1063/1.5124649}. \url{https://doi.org/10.1063/1.5124649} \bibitem[Faye et al.]{b19}\label{b19} ‘2022) Mango Diseases Classification Solutions Using Machine Learning or Deep Learning: A Review’. D Faye , I Diop , D Dione . \xref{http://dx.doi.org/10.4236/jcc.2022.1012002}{10.4236/jcc.2022.1012002}. \textit{Journal of Computer and Communications} 10 p. . \bibitem[Fuentes et al. ()]{b4}\label{b4} ‘A Robust Deep-Learning-Based Detector for Real-Time Tomato Plant Diseases and Pests Recognition’. A Fuentes , S Yoon , S Kim , D Park . \textit{Sensors} 2017. 17 (9) p. 2022. \bibitem[Shorten and Khoshgoftaar ()]{b11}\label{b11} ‘A survey on Image Data Augmentation for Deep Learning’. C Shorten , T M Khoshgoftaar . \xref{http://dx.doi.org/10.1186/s40537-019-0197-0}{10.1186/s40537-019-0197-0}. \url{https://doi.org/10.1186/s40537-019-0197-0} \textit{J Big Data} 2019. 6 p. 60. \bibitem[Simonyan and Zisserman ()]{b10}\label{b10} \textit{A8\textunderscore Large-Scale Image Recognition. Very Deep Convolutional Networks for Large-Scale Image Recognition}, K Simonyan , A Zisserman . \xref{http://dx.doi.org/10.48550/arXiv.1409.1556}{10.48550/arXiv.1409.1556}. \url{https://doi.org/10.48550/arXiv.1409.1556} 2014. \bibitem[Agastya and Setyanto ()]{b13}\label{b13} ‘Classification of Indonesian Batik Using Deep Learning Techniques and Data Augmentation’. M A Agastya , A Setyanto . \xref{http://dx.doi.org/10.1109/ICITISEE.2018.8720990}{10.1109/ICITISEE.2018.8720990}. \textit{3rd International Conference on Information Technology, Information System and Electrical Engineering (ICITISEE)}, 2018. 2018. p. . \bibitem[Dandavate and Patodkar ()]{b12}\label{b12} ‘CNN and Data Augmentation Based Fruit Classification Model’. R Dandavate , V Patodkar . \xref{http://dx.doi.org/10.1109/I-SMAC49090.2020.9243440}{10.1109/I-SMAC49090.2020.9243440}. \textit{2020 Fourth International Conference on I-SMAC (IoT in Social, Mobile, Analytics and Cloud) (I-SMAC)}, 2020. p. . \bibitem[Kusrini et al. ()]{b0}\label{b0} ‘Data augmentation for automated pest classification in Mango farms’. K Kusrini , S Suputa , A Setyanto , I M A Agastya , H Priantoro , K Chandramouli , E Izquierdo . doi:10.10 16/j.compag.2020.105842. \textit{Computers and Electronics in Agriculture} 2020. 179 p. 105842. \bibitem[Bargoti and Underwood ()]{b14}\label{b14} ‘Deep fruit detection in orchards’. S Bargoti , J Underwood . \xref{http://dx.doi.org/10.1109/ICRA.2017.7989417}{10.1109/ICRA.2017.7989417}. \textit{2017 IEEE International Conference on Robotics and Automation (ICRA}, 2017. p. . \bibitem[Wu et al. ()]{b15}\label{b15} ‘Deep Learning for Automatic Quality Grading of Mangoes: Methods and Insights’. S. -L Wu , H. -Y Tung , Y. -L Hsu . \xref{http://dx.doi.org/10.1109/ICMLA51294.2020.00076}{10.1109/ICMLA51294.2020.00076}. \textit{2020 19th IEEE International Conference on Machine Learning and Applications (ICMLA)}, 2020. p. . \bibitem[Shih-Lun et al. ()]{b3}\label{b3} \textit{Deep Learning for Automatic Quality Grading of Mangoes: Methods and Insights. Computer Vision and Pattern Recognition}, Shih-Lun , Hsiao-Yen Wu , Yu-Lun Tung , Hsu . 2020. \bibitem[He ()]{b20}\label{b20} ‘Deep Residual Learning for Image Recognition’. Kaiming He . \textit{IEEE Conference on Computer Vision and Pattern Recognition (CVPR)}, 2016. 2015. p. . \bibitem[Zhang et al. ()]{b16}\label{b16} ‘Image based fruit category classification by 13-layer deep convolutional neural network and data augmentation’. Y D Zhang , Z Dong , X Chen . \xref{http://dx.doi.org/10.1007/s11042-017-5243-3}{10.1007/s11042-017-5243-3}. \url{https://doi.org/10.1007/s11042-017-5243-3} \textit{Multimed Tools Appl} 2019. 78 p. . \bibitem[Major Tropical Fruits: Preliminary results 2021]{b18}\label{b18} \textit{Major Tropical Fruits: Preliminary results 2021}, FAO. 2022. Rome. \bibitem[Sutrodhor et al. (2018)]{b6}\label{b6} ‘Mango Leaf Ailment Detection using Neural Network Ensemble and Support Vector Machine’. Nabodip Sutrodhor , Md Firoz Molla Rashied Hussein , Prokash Mridha , Tasrif Karmokar , Nur . \xref{http://dx.doi.org/10.5120/ijca2018917746}{10.5120/ijca2018917746}. \textit{International Journal of Computer Applications} August 2018. 181 (13) p. . \bibitem[Saleem et al.]{b8}\label{b8} ‘Mango Leaf Disease Recognition and Classification Using Novel Segmentation and Vein Pattern Technique’. R Saleem , J H Shah , M Sharif , M Yasmin , H.-S Yong , J Cha . \xref{http://dx.doi.org/10.3390/app112411901}{10.3390/app112411901}. \url{https://doi.org/10.3390/app112411901} \textit{Appl. Sci} 2021 p. 11901. \bibitem[Mia et al. ()]{b9}\label{b9} ‘Mango leaf disease recognition using neural network and support vector machine’. M R Mia , S Roy , S K Das , M A Rahman . doi: 10.1007/s 42044-020-00057-z. \textit{Iran Journal of Computer Science} 2020. 3 (3) p. . \bibitem[Arivazhagan and Vineth Ligi ()]{b7}\label{b7} ‘Mango Leaf Diseases Identification Using Convolutional Neural Network’. S Arivazhagan , S Vineth Ligi . \textit{International Journal of Pure and Applied Mathematics} 2018. 2018. 120 (6) p. . \bibitem[Supekar and Wakode ()]{b17}\label{b17} ‘Multi-Parameter Based Mango Grading Using Image Processing and Machine Learning Techniques’. A D Supekar , M Wakode . \url{https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/756} \textit{INFOCOMP Journal of Computer Science} 2020. 19 (2) p. . \bibitem[Ali et al. ()]{b21}\label{b21} ‘Performance Evaluation of Deep CNN-Based Crack Detection and Localization Techniques for Concrete Structures’. L Ali , F Alnajjar , H A Jassmi , M Gocho , W Khan , M A Serhani . \xref{http://dx.doi.org/10.3390/s21051688}{10.3390/s21051688}. \url{https://doi.org/10.3390/s21051688} \textit{Sensors} 2021. 21 (5) p. 1688. \bibitem[Chiagoziem et al.]{b22}\label{b22} \textit{Recent Advancements in Fruit Detection and Classification Using Deep Learning Techniques}, C Chiagoziem , Qin Ukwuoma , Md Zhiguang , Belal Bin , Liaqat Heyat , Zahra Ali , Happy N Almaspoor , Monday . \xref{http://dx.doi.org/10.1155/2022/9210947}{10.1155/2022/9210947}. ID 9210947. \url{https://doi.org/10.1155/2022/9210947} 2022 p. 29. (Mathematical Problems in Engineering) \bibitem[Szegedy et al. ()]{b5}\label{b5} ‘Rethinking the in ception architecture for computer vision’. C Szegedy , V Vanhoucke , S Ioffe , J Shlens , Z Wojna . \textit{Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition}, (the IEEE Conference on Computer Vision and Pattern RecognitionLas Vegas) 2016. p. . \bibitem[Rosman et al. ()]{b1}\label{b1} ‘Review: Some common disease in mango’. N F Rosman , N A Asli , S Abdullah , M Rusop . \textit{AIP Conference Proceedings} 2019. 2151 p. 20019. \end{bibitemlist} \end{document}