Activity of benomyl for control of postbloom fruit drop of citrus caused by Colletotrichum acutatum

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dc.contributor.authorPeres, N. A. R. [UNESP]
dc.contributor.authorSouza, N. L. [UNESP]
dc.contributor.authorZitko, S. E.
dc.contributor.authorTimmer, L. W.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Florida
dc.date.accessioned2014-05-27T11:20:28Z
dc.date.available2014-05-27T11:20:28Z
dc.date.issued2002-06-04
dc.description.abstractPostbloom fruit drop (PFD) of citrus caused by Colletotrichum acutatum produces orange-brown lesions on petals and induces the abscission of young fruitlets and the retention of the calyces. Despite the fact that C. acutatum is not highly sensitive to benomyl in culture, this fungicide provides good control of the disease under field conditions. This study was undertaken to determine the effect of benomyl on various stages of disease development to understand the basis for its effectiveness in the field. We found that benomyl at 1.0 μg/ml reduced colony area of C. acutatum by about 75% and completely inhibited growth of C. gloeosporioides. Benomyl did not prevent conidial germination even at 100 μg/ml, but reduced germ tube elongation at 10 and 100 μg/ml. When benomyl was applied to flower clusters on screen-house-grown plants before inoculation, disease severity was greatly reduced. Applications at 24 and 48 h, but not at 72 h, after inoculation reduced PFD severity. Application of benomyl to symptomatic petals not bearing conidia did not prevent or reduce production of inoculum. Application to petals bearing conidia reduced viability of these fungal propagules by only about 50%. The viability of appressoria on mature leaves was not affected by benomyl application. Even when appressoria on mature leaves were stimulated to germinate by treatment with flower extracts, subsequent application of benomyl did not reduce propagule numbers below original levels. Benomyl appears to act by preventing infection and early development of the fungus in petals. However, once symptoms have developed, this fungicide has only minimal effects on further disease development and spread.en
dc.description.affiliationUniversidade Estadual Paulista FCA, Botucatu, SP
dc.description.affiliationUniversity of Florida Citrus Research and Education Center, Lake Alfred, FL 33850
dc.description.affiliationBASF Corporation, P.O. Box 400, Princeton, NJ 08543-0400
dc.description.affiliationUnespUniversidade Estadual Paulista FCA, Botucatu, SP
dc.format.extent620-624
dc.identifierhttp://dx.doi.org/10.1094/PDIS.2002.86.6.620
dc.identifier.citationPlant Disease, v. 86, n. 6, p. 620-624, 2002.
dc.identifier.doi10.1094/PDIS.2002.86.6.620
dc.identifier.issn0191-2917
dc.identifier.scopus2-s2.0-0036111757
dc.identifier.urihttp://hdl.handle.net/11449/66906
dc.identifier.wosWOS:000175762200011
dc.language.isoeng
dc.relation.ispartofPlant Disease
dc.relation.ispartofjcr2.941
dc.relation.ispartofsjr0,575
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectDisease control
dc.subjectFungi
dc.subjectFungicides
dc.subjectFlower extracts
dc.subjectFruits
dc.subjectCitrus
dc.subjectColletotrichum
dc.subjectGlomerella acutata
dc.subjectGlomerella cingulata
dc.titleActivity of benomyl for control of postbloom fruit drop of citrus caused by Colletotrichum acutatumen
dc.typeArtigo
dcterms.licensehttp://apsjournals.apsnet.org/page/terms.jsp

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