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Downy Mildew

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.

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Downy Mildew

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  1. Downy Mildew Robert Fairchild VWT 35

  2. 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. • Plasmoparaviticola

  3. 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 • http://stcoemgen.com/2013/06/03/downy-mildew-2/

  4. Biology of Pest • Disease Cycle Photo courtesy of http://maryam2230.blogfa.com/post-91.aspx

  5. Damage Caused/Monitoring • Symptoms • Signs Photos of my Cabernet Sauvignon

  6. Management • Cultural Control • sanitation • Mechanical and Physical • None identified • Biological • None identified • Chemical • Bordeaux blend (Cu & S blend)

  7. References • Bettiga, L.J. (Ed.). (2013). Grape Pest Management, (3rd Ed.). Berkeley: University of California Press. • Dicklow, M.B., (2013). Downy Mildews of Ornamental Plants. Retrieved on 4/22/2014 from https://extension.umass.edu/floriculture/fact-sheets/downy-mildews-ornamental-plants • Evert, R.F. and Eichhorn, S.E., (2013). Raven Biology of Plants, (8th Ed.) New York: W. H. Freeman and Company. • Hoffman, U., (2008). "Optimization of downy mildew (Plasmoparaviticola) 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 - VillafrancaPenedes • Ontario Ministry of Agriculture and Food staff, (2012). Publication 370 - Guide to Greenhouse Floriculture Production: Chapter 8 - Major Greenhouse Diseases. Retrieved on 4/20/2014 from http://www.omafra.gov.on.ca/english/crops/pub370/pub370ch8.htm#fig84. • Winkler, A.J., Cook, J.A., Kliewer, W.M., & Lider, L.A. (1974). General Viticulture. Berkeley: University of California Press.

  8. Questions?

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