Downy Mildew Robert Fairchild VWT 35
Introduction Serious grape pest since mid-1800s. Prevalent in warm areas with early spring rains/high humidity Economic impact depends on the grape growing region. Plasmopara viticola
Description of Pest/Weakness Over-winters as Oospores in moist soil. May over-winter as mycelium in buds or leaves that persist through winter. Requires water for initial spread Photo from
Biology of Pest Disease Cycle Photo courtesy of
Damage Caused/Monitoring Symptoms Signs Photos of my Cabernet Sauvignon
Management Cultural Control sanitation Mechanical and Physical None identified Biological None identified Chemical Bordeaux blend (Cu & S blend)
References Bettiga, L.J. (Ed.). (2013). Grape Pest Management, (3 rd Ed.). Berkeley: University of California Press. Dicklow, M.B., (2013). Downy Mildews of Ornamental Plants. Retrieved on 4/22/2014 from mildews-ornamental-plants Evert, R.F. and Eichhorn, S.E., (2013). Raven Biology of Plants, (8 th Ed.) New York: W. H. Freeman and Company. Hoffman, U., (2008). "Optimization of downy mildew (Plasmopara viticola) control "in organic viticulture with low copper doses, new copper formulations and plant strengtheners, results of 20 years of on farm research"- In: Proceedings of Ecosostenible-wine; INCAVI - Jornades techniques internationals - Villafranca Penedes Ontario Ministry of Agriculture and Food staff, (2012). Publication Guide to Greenhouse Floriculture Production: Chapter 8 - Major Greenhouse Diseases. Retrieved on 4/20/2014 from Winkler, A.J., Cook, J.A., Kliewer, W.M., & Lider, L.A. (1974). General Viticulture. Berkeley: University of California Press.
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