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- Title
PHYSICAL MODE OF ACTION OF MEPTYLDINOCAP AGAINST ERYSIPHE NECATOR, THE GRAPEVINE POWDERY MILDEW FUNGUS.
- Authors
Legler, S. E.; Caffi, T.; Russo, G.; Rossi, V.
- Abstract
In many grape-growing areas, the primary inoculum of powdery mildew casused by Erysiphe necator consists of ascospores produced in chasmothecia. Primary infections trigger epidemics, which are then driven by conidial infections. Although powdery mildew control has traditionally focused on preventing conidial infections, we recently developed a control strategy that combines sanitation of chasmothecia in autumn or winter and early fungicide applications against ascospores in the next spring; the fungicide applications are based on a weather-driven, mechanistic model. This "across-season" strategy requires knowledge the physical mode of action (PMoA) of each fungicide. PMoA describes the effect of a fungicide with respect to the time of application (relative to the host-pathogen interaction) and the duration and degree of its activity. This work investigated the PMoA of the recently available dinitrophenol fungicide meptyldinocap against E. necator. In environmentally-controlled and semi-field experiments, meptyldinocap had high preventative and curative efficacy. When applied 1 to 6 days before inoculation, meptyldinocap prevented infection; when applied within 72 h after inoculation, it prevented colony formation. When applied on established colonies, it reduced conidia production by 55% and conidia vitality by 95%. Meptyldinocap also reduced chasmothecia formation and ascospore viability in mature chasmothecia. Scanning electron microscopy revealed that all fungal structures were collapsed. This work shows that powdery mildew control can be improved by combining weather-driven, mechanistic disease models and information on fungicide PMoA.
- Subjects
UNCINULA necator; ERYSIPHE diseases; GRAPE diseases &; pests; POWDERY mildew diseases; FUNGAL diseases of plants; FUNGI imperfecti; FUNGICIDES
- Publication
Journal of Plant Pathology, 2012, Vol 94, Issue 4, pS4.66
- ISSN
1125-4653
- Publication type
Article