The risk assessment index in grape powdery mildew control decisions and the effect of temperature and humidity on conidial germination of <i>Erysiphe necator</i>

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dc.contributor.authorBendek, C. E.
dc.contributor.authorCampbell, P. A.
dc.contributor.authorTorres, R.
dc.contributor.authorDonoso, A.
dc.contributor.authorLatorre, B. A.
dc.date.accessioned2025-01-21T01:05:18Z
dc.date.available2025-01-21T01:05:18Z
dc.date.issued2007
dc.description.abstractPowdery mildew (Erysiphe necator) is a major disease of grapevines (Vitis vinifera) in Chile. Severe outbreaks have occurred recently despite the use of strict fungicide programs to control it. The objectives of this study were to evaluate the infection risk assessment index (RAI), to predict conditions for E. necator infection, and to study the effect of temperature (T), relative humidity (RH) and free moisture (FM) on conidial germination and disease development. Conidial germination was affected by T, RH, and FM. There were significant (p < 0.001) interactions between E. necator isolates and T and between isolates and RH. Conidial germination was optimal at 25 degrees C. There was no germination at 5 degrees C and 35 degrees C. At 20 degrees C, conidia germinated at a low RH (33-35%). Germination increased at a RH between 47 and 90% but decreased at higher RHs. Powdery mildew development on Carmenere,Chardonnay,and Merlot vines increased linearly from 6 degrees C to 23 degrees C. These grape cultivars were all equally susceptible to E. necator. Incubation periods varied. It was 13 to 14 d at 20 degrees C or 23 degrees C, 19 to 24 d at 10 degrees C, and more than 23 d at 6 degrees C. Grape powdery mildew was markedly decreased when inoculated leaves were wet at 1 or 72 h post inoculation. In conclusion, RAI, determined on the basis of air T, was useful to decide on fungicide applications between grape bud burst and veraison in Chile.
dc.fuente.origenWOS
dc.identifier.eissn2171-9292
dc.identifier.issn1695-971X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95884
dc.identifier.wosidWOS:000251560000012
dc.issue.numero4
dc.language.isoen
dc.pagina.final532
dc.pagina.inicio522
dc.revistaSpanish journal of agricultural research
dc.rightsacceso restringido
dc.subjectdisease forecasting
dc.subjectgrape diseases
dc.subjectUncinula
dc.subjectVitis vinifera
dc.subject.ods13 Climate Action
dc.subject.ods02 Zero Hunger
dc.subject.odspa13 Acción por el clima
dc.subject.odspa02 Hambre cero
dc.titleThe risk assessment index in grape powdery mildew control decisions and the effect of temperature and humidity on conidial germination of <i>Erysiphe necator</i>
dc.typeartículo
dc.volumen5
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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