Skip to main content

Recent downy mildew risk events

 It seems that several rain events have happened over the course of the past two weeks or so. Here is a summary of recent downy mildew risk events, based on the NEWA stations and DMCast.

Bristol, VA

Fifteen days with potential DM infection event(s) since Sept 1. The latest event happened last Sunday.

Floyd, VA



Eleven days with potential DM infection event(s) since Sept 1. The last event happened last Friday.

Charles City, VA


Twelve days with potential DM infection event(s) since Sept 1. The latest event happened yesterday.

Central VA

Since there was a wide variation among stations, I am listing several around Central VA.

Tyro, VA


Nine days with potential DM infection event(s) since Sept 1. The latest event happened yesterday.

Red Hill and Crozet, VA

Only one day with potential DM infection event(s) since Sept 1.

Olympic Lake


Thirteen days with potential DM infection event(s) since Sept 1. The latest event happened last Sunday.

Washington, VA


Eight days with potential DM infection event(s) since Sept 1. The latest event happened last Sunday.


Winchester, VA


Seven days with potential DM infection event(s) since Sept 1. The latest event happened last Friday.

Some rain events are sporadic and the amount of rain or length of leaf wetness can vary even within a few miles. Thus, please make sure to check your local weather. 

In general, it is probably a good idea to protect your vines against downy mildew this time of the season, and if you think your previous application was washed off from the rains, add a phos acid to your tank mix for your next spray.

List of short PHI fungicides for late-season diseases (will open a pdf file)


Comments

Popular posts from this blog

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