Spatiotemporal characterization of citrus postbloom fruit drop in Brazil and its relationship to pathogen dispersal
Identifieur interne : 000C45 ( Main/Exploration ); précédent : 000C44; suivant : 000C46Spatiotemporal characterization of citrus postbloom fruit drop in Brazil and its relationship to pathogen dispersal
Auteurs : G. J. Silva-Junior [Brésil] ; M. B. Sposito [Brésil] ; D. R. Marin [Brésil] ; P. J. Jr Ribeiro [Brésil] ; L. Amorim [Brésil]Source :
- Plant pathology [ 0032-0862 ] ; 2014.
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- Pascal (Inist)
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English descriptors
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Abstract
Citrus postbloom fruit drop (PFD) is caused by Colletotrichum acutatum and C. gloeosporioides. These pathogens attack the flowers and cause premature fruit drop and the retention of fruit calyces. This study was designed to characterize the spatial and temporal dynamics of PFD in commercial citrus-growing areas to better understand the disease spread. Experiments were carried out in three young orchards (500 trees each) in two municipalities in Sao Paulo State, Brazil. Symptoms of PFD on the flowers and presence of persistent calyces were assessed in each of three orchards for three years. Logistic, Gompertz and monomolecular models were fitted to the incidence data over time from the trees with symptoms. The spatial pattern of diseased trees was characterized by a dispersion index and by Taylor's power law. An autologistic model was used for the spatiotemporal analysis. The logistic model provided the best fit to the disease incidence data, which had a fast progress rate of 0.53 per day. During the early epidemic of PFD, the spatial pattern of diseased trees was random, which suggested that inoculum spread was due to mechanisms other than rain splash. As the disease incidence increased (up to 12.6%), the spatial pattern of diseased trees became aggregated. The rapid rate of disease progress and the distribution of PFD suggest that dispersal of the pathogen is possibly related to a mechanism other than splash dispersal, which is more typical of other fruit diseases caused by Colletotrichum spp.
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J." last="Silva-Junior">G. J. Silva-Junior</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Plant Pathology Department, University of Sao Paulo</s1><s2>Piracicaba, SP, 13418-900</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Brésil</country><placeName><settlement type="city">São Paulo</settlement><region type="state">État de São Paulo</region></placeName><orgName type="university">Université de São Paulo</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Research and Development Department, Fundecitrus</s1><s2>Araraquara, SP, 14801-970</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Brésil</country><wicri:noRegion>Araraquara, SP, 14801-970</wicri:noRegion></affiliation></author><author><name sortKey="Sposito, M B" sort="Sposito, M B" uniqKey="Sposito M" first="M. B." last="Sposito">M. B. 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Amorim</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Plant Pathology Department, University of Sao Paulo</s1><s2>Piracicaba, SP, 13418-900</s2><s3>BRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Brésil</country><placeName><settlement type="city">São Paulo</settlement><region type="state">État de São Paulo</region></placeName><orgName type="university">Université de São Paulo</orgName></affiliation></author></analytic><series><title level="j" type="main">Plant pathology</title><title level="j" type="abbreviated">Plant pathol.</title><idno type="ISSN">0032-0862</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Plant pathology</title><title level="j" type="abbreviated">Plant pathol.</title><idno type="ISSN">0032-0862</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abscission</term><term>Brazil</term><term>Characterization</term><term>Citrus fruit</term><term>Citrus sinensis</term><term>Colletotrichum acutatum</term><term>Dispersion</term><term>Flower</term><term>Fruit</term><term>Fruit drop</term><term>Inoculum</term><term>Logistic model</term><term>Modeling</term><term>Pathogenic</term><term>Plant pathology</term><term>Relation</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Caractérisation</term><term>Abscission</term><term>Fruit</term><term>Relation</term><term>Pathogène</term><term>Dispersion</term><term>Fleur</term><term>Modèle logistique</term><term>Inoculum</term><term>Citrus sinensis</term><term>Colletotrichum acutatum</term><term>Agrume</term><term>Brésil</term><term>Phytopathologie</term><term>Modélisation</term><term>Chute de fruit</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Brésil</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Fruit</term><term>Agrume</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Citrus postbloom fruit drop (PFD) is caused by Colletotrichum acutatum and C. gloeosporioides. These pathogens attack the flowers and cause premature fruit drop and the retention of fruit calyces. This study was designed to characterize the spatial and temporal dynamics of PFD in commercial citrus-growing areas to better understand the disease spread. Experiments were carried out in three young orchards (500 trees each) in two municipalities in Sao Paulo State, Brazil. Symptoms of PFD on the flowers and presence of persistent calyces were assessed in each of three orchards for three years. Logistic, Gompertz and monomolecular models were fitted to the incidence data over time from the trees with symptoms. The spatial pattern of diseased trees was characterized by a dispersion index and by Taylor's power law. An autologistic model was used for the spatiotemporal analysis. The logistic model provided the best fit to the disease incidence data, which had a fast progress rate of 0.53 per day. During the early epidemic of PFD, the spatial pattern of diseased trees was random, which suggested that inoculum spread was due to mechanisms other than rain splash. As the disease incidence increased (up to 12.6%), the spatial pattern of diseased trees became aggregated. The rapid rate of disease progress and the distribution of PFD suggest that dispersal of the pathogen is possibly related to a mechanism other than splash dispersal, which is more typical of other fruit diseases caused by Colletotrichum spp.</div></front></TEI><affiliations><list><country><li>Brésil</li></country><region><li>État de São Paulo</li></region><settlement><li>São Paulo</li></settlement><orgName><li>Université de São Paulo</li></orgName></list><tree><country name="Brésil"><region name="État de São Paulo"><name sortKey="Silva Junior, G J" sort="Silva Junior, G J" uniqKey="Silva Junior G" first="G. J." last="Silva-Junior">G. J. Silva-Junior</name></region><name sortKey="Amorim, L" sort="Amorim, L" uniqKey="Amorim L" first="L." last="Amorim">L. Amorim</name><name sortKey="Marin, D R" sort="Marin, D R" uniqKey="Marin D" first="D. R." last="Marin">D. R. Marin</name><name sortKey="Ribeiro, P J Jr" sort="Ribeiro, P J Jr" uniqKey="Ribeiro P" first="P. J. Jr" last="Ribeiro">P. J. Jr Ribeiro</name><name sortKey="Silva Junior, G J" sort="Silva Junior, G J" uniqKey="Silva Junior G" first="G. J." last="Silva-Junior">G. J. Silva-Junior</name><name sortKey="Sposito, M B" sort="Sposito, M B" uniqKey="Sposito M" first="M. B." last="Sposito">M. B. Sposito</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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