(I'm still at a meeting, so, I will make it quick.) At Winchester, the series of rain started around 2 AM on this Monday (5/17/10), it was not a continuous rain, but we had frequent enough rain events during Monday, Tuesday, and this morning to keep the relative humidity high (>90%) until ~9:30 AM today. During Tuesday, there was a moment when the RH was little less than 90%, but it was still in high 80's. Thus, I would say this rain event accounted for about 55.5 hours of wetness and average temperature during this period was about 58F. Thus, it was long and warm enough for downy mildew, black rot, and Phomopsis. Some of us are expecting bloom very soon. Please remember that the critical time for downy, black rot, and powdery mildew berry infection is from bloom to 4-5 weeks after bloom.
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
Comments
Post a Comment
Please leave your comment here. In order to avoid spam messages, l moderate comments, thus it may take a few hours for your comment to be posted on the page.