Diease risks from yesterday

Winchester area received a shower yesterday, resulted in 5+ hours of wetness in lower 70F. It was an infection risk event for downy mildew, and very low infection risk event for Botrytis. In addition, we observed dews in the last two nights, indicating high humidity, which can trigger downy mildew to produce spores. As usual, late season downy tends to appear on younger leaves on the top of the canopy. Please keep eyes on them! There is a chance of rain on Sunday and Monday.

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2021 Pest Management Guides for grapes (UPDATED 24 March 2021)

Updated: Links below are for the 2021 edition of Pest Management Guides. The first one is for home gardens, and the second is for commercial productions. I asked them to provide by chapter (= crop) and they made changes. :) 1) Visit the page by clicking one of the links below. (It is rather a slow page. Please be patient.) 2) Scroll down until you see "Links to individual chapters." Grapes are chapter 3 for both Home (Home Fruits) and Commercial Crops (Grapes) 3) Once you get to the site, click "PDF", then "Preview", and it will open a new window. 4) Scroll down a bit, and click "Download Version" to download the file to your computer. 2021 Home Grounds Pest Management Guide 2021 Horticulture and Forest Pest Management Guide

Late-season grape disease management tips.

Recent rains and more rains in the forecast made me think of downy mildew. Let's take a look at what the NEWA DMCast model says about downy mildew risks from the past two weeks. Westfield, NC (South of Stuart, VA) There were six DM risk events, including one that happened today. (Note: we have a new weather station in Bristol. You can check the weather data, but the DMCast model is not working yet. I notified the NEWA about the lack of DMCast outputs.) Floyd, VA There were four days with downy mildew risk event(s) since the beginning of the month. Red Hill There were four days with downy mildew risk event(s) since the beginning of the month. Washington, VA There were nine days with downy mildew risk event(s) since the beginning of the month. Winchester, VA There were five days with downy mildew risk event(s) since the beginning of the month. It looks like there were more downy mildew risk events as we move northwards. Also, recent warm and humid nights can promote the downy mildew

My handout from today's VVA summer technical meeting.

Thanks again to those of you who made it to the meeting. It was nice to have a face-to-face meeting after the whole thing we are in together. Here's my handout from today's meeting. It will open a new window with a pdf file.

Virginia Grape Disease Updates

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