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2011 Sonoma County Grape Day

Sonoma County Grape Day will be held Wednesday, February 23, 2011 in the Merlo Theater at the Wells Fargo Center for the Arts. This is an annual event presented by UC Cooperative Extension Viticulture Farm Advisor Rhonda Smith and sponsored by the Sonoma County Winegrape Commission. Five speakers will present updates on continuing research projects.

Controlling European Grapevine Moth: Lessons Learned in the First Year
European Grapevine Moth was the focus of several research projects conducted by Dr. Lucia Varela in 2010 in Napa County where this exotic pest was introduced and she will present the take home messages from those trials. Emphasis will be placed on strategically timed applications in 2011 based on trap catches and the degree-day model that is under development. Rhonda Smith will describe the outcome of trials with infested fruit pressed and crushed at a winery.

The Role of Rootstocks in Achieving Vine Balance
Dr. Jim Wolpert has been involved in grapevine rootstock trials in California for over 20 years. He will discuss vegetative growth and vigor of rootstocks in the context of other components of vineyard design.

Fundamentals of Vineyard Frost Protection
Dr. Rick Snyder will primarily focus his frost protection presentation on the use of water and wind to prevent plant damage caused by radiation frosts common in north coast vineyards. He will explain why dew point and wet bulb temperatures are important considerations in deciding when to turn on sprinklers and how to measure these temperatures. The operating principles and site conditions required for wind machines will be given.

Measuring Pump Flow Rates: Flow Meters and Pump Curves
Dr. Larry Schwankl has considerable experience with flow meters in his research in both crop production and dairy operation and will explain the pros and cons of different types of meters in specific applications. Understanding what is required at the pump station for accurate flow rate measurements will be covered as well as options for storing and retrieving the data.