Effect of fungicide spray cover on botrytis cinerea infection in grape bunches

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dc.contributor.authorBrink, J. C.en_ZA
dc.contributor.authorHolz, G.en_ZA
dc.contributor.authorFourie, P. H.en_ZA
dc.date.accessioned2017-05-24T11:55:31Z
dc.date.available2017-05-24T11:55:31Z
dc.date.issued2006
dc.descriptionCITATION: Brink, J. C., Holz, G. & Fourie, P. H. 2006. Effect of fungicide spray cover on botrytis cinerea infection in grape bunches. South African Journal of Enology & Viticulture, 27(1):51-56, doi:10.21548/27-1-1600.en_ZA
dc.descriptionThe original publication is available at http://www.journals.ac.za/index.php/sajeven_ZA
dc.description.abstractThe effect of fungicide spray cover on Botrytis cinerea infection in grape bunches was determined. Bunches were sprayed at pea size and bunch closure with different volumes of a mixture of fenhexamid and a yellow fluorescent pigment, and the percentage fluorescent pigment coverage on pedicels was determined. Bunches were subsequently dusted with dry airborne conidia of B. cinerea in a settling tower and incubated for 24 h at high relative humidity (98%). Infection was determined by estimating the amount of B. cinerea infections on susceptible bunch parts (pedicel, receptacle and rachis) with isolations onto paraquat (herbicide) and Kerssies (B. cinerea selective) mediums. Linear regressions for the part × stage combinations of percentage B. cinerea incidence on different bunch parts were fitted on mean coverage levels. An increase in spray cover caused linear reductions in levels of B. cinerea on bunch parts. Higher B. cinerea incidences were recorded at pea size. Furthermore, higher B. cinerea incidences were found on paraquat medium for both stages, than on Kerssies medium. The information gathered from this study will be used to facilitate future determination of minimum effective coverage levels for effective B. cinerea control in grape bunches.en_ZA
dc.description.urihttp://www.journals.ac.za/index.php/sajev/article/view/1600
dc.description.versionPublisher's versionen_ZA
dc.format.extent6 pages : illustrationsen_ZA
dc.identifier.citationBrink, J. C., Holz, G. & Fourie, P. H. 2006. Effect of fungicide spray cover on botrytis cinerea infection in grape bunches. South African Journal of Enology & Viticulture, 27(1):51-56, doi:10.21548/27-1-1600en_ZA
dc.identifier.issn2224-7904 (online)
dc.identifier.issn0253-939X (print)
dc.identifier.otherdoi:10.21548/27-1-1600
dc.identifier.urihttp://hdl.handle.net/10019.1/101586
dc.language.isoen_ZAen_ZA
dc.publisherSouth African Society for Enology and Viticultureen_ZA
dc.rights.holderSouth African Society for Enology and Viticultureen_ZA
dc.subjectFungicide sprayen_ZA
dc.subjectBotrytis cineria infectionen_ZA
dc.subjectFlourescent pigment coverageen_ZA
dc.subjectGrapes -- Diseases and pests -- Controlen_ZA
dc.titleEffect of fungicide spray cover on botrytis cinerea infection in grape bunchesen_ZA
dc.typeArticleen_ZA
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