Vineyard & Winery Management

May/June 2013

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SPORE TRAPS HELP DETECT POWDERY MILDEW INOCULUM VINEYARD MONITORING MAY HELP GROWERS REDUCE SPRAY APPLICATIONS BY TED RIEGER, SENIOR FEATURE EDITOR oastal Viticultural Consultants Inc. (CVC) of Napa Valley, Calif., has commercialized a powdery mildew (PM) spore trap and inoculum detection procedure for vineyards. It was developed and field tested in Northwest vineyards by research p l a n t p a t h o l o g i s t Wa l t Mahaffee of the USDA Agricultural Research Service in Corvallis, Ore., and professor Gary Grove of Washington State University in Prosser. CVC builds and installs spore traps, and regularly collects trap samples for 64 V I N E YARD & WINERY MANAGEMENT lab testing as a service for grapegrower clients in Northern California. CVC's PM trap service has increased from an initial testing of six traps during 2011 to 15 traps in 2012 and 24 for 2013. POWDERY MILDEW INFECTION Grape PM, caused by the fungal pathogen Erysiphe necator (E. necator), is a common problem that can quickly develop during early season vine growth and persist as a threat through veraison. | May - June 2013 AT A GLANCE + Spore traps can provide information about the presence of powdery mildew inoculum in a vineyard. + Studies indicate that monitoring PM inoculum may save a grower one or more spray applications per season. + Coastal Viticultural Consultants offers a PM spore trap and inoculum detection and monitoring service. + Researchers are working to develop portable in-field analytical tools to determine the presence of PM inoculum. w w w. v w m m e d i a . c o m

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