Tuesday, March 19, 2019

Presentation slides from UGA Seasonal vineyard and pest management conference

Here are slides from my presentations at UGA Seasonal Vineyard and Pest Management Conference.

1) Ripe rot research updates

2) Introduction to trunk disease diagnostic aid app and GrapeIPM.org.


FYI: Our next grape disease management meetings are at Loudon County Extension Office. Please RSVP with Ms. Beth Sastre (flores69 (at mark) vt.edu).

Thursday, April 04, 2019

Vineyard IPM Program (1 - 4 pm)
Disease management in the Vineyard (Spanish)
Loudoun County Cooperative Extension office
750 Miller Drive, SE
Suite F-3
Leesburg, VA 20175

Friday, April 05, 2019

Vineyard IPM Program (1-4 pm)
Disease Management in the Vineyard (English)
Loudoun County Cooperative Extension office
750 Miller Drive, SE
Suite F-3
Leesburg, VA 20175

Thursday, March 14, 2019

2019 version of a fungicide application template

Here's a 2019 version of fungicide application template. Please read the footnote for downloading onto your computer or copy to your Google Drive to use it.

This template is designed to be used as a guide. You need to create your own plan based on your vineyard(s)!!

If you have time tomorrow afternoon, please join us for our first grapeIPM.org training session, which will be held at Horton Vineyards from 1 PM. It would be a great excuse to visit Horton to taste their award-winning wines!

Tuesday, March 12, 2019

GrapeIPM.org training on March 15th at Horton Vineyards

We will hold a training session for GrapeIPM.org on March 15th (this Friday) at Horton Vineyards (6399 Spotswood Trail, Gordonsville, VA 22942). The meeting starts at 1 PM and closes at 3 PM.

  • GrapeIPM.org is our new online database and risk assessment system which allows you to manage your pesticide records and planning. We introduced it to select growers in 2018, and we are extending the invitation to more growers this year.
  • You can assign multiple vineyards or blocks (whichever you wish to call). 
  • The system has a pre-made list of commonly used fungicides (we are working on insecticide now), thus, what you need to do is pick the one you have in your inventory, and enter in the system's calendar. 
    • If you happen to use not-so-common pesticides, we are working on an interface that allows you to enter your own.
  • You can enter the area to be applied and the size of your sprayer, and the system will give you an estimate of how much you need to mix in your sprayer too. 
  • Once you create your plan, you can export it to a calendar (Google or iCal) to share with your co-workers. 
  • When you complete the spray, you check off, and at the end of the season, you can generate a table that meets the EPA's expectation for your record keeping.
  • There is a function to enter your current inventory. If you use this function, you can check what needs to be purchased when you finish your planning for the year.
  • It also helps tracking your other activities and record (e.g., pruning, weeding, growth stage, disease outbreak, etc). 
  • Also, if you happen to have a vineyard close to one of our weather stations, you can connect to it to obtain recent weather information as well.
  • My research associate, Mr. Robert Burgholzer, who is also a vineyard owner, and I will host the meeting to introduce the system and walk you through the functions. 
  • This system is web-based and mobile-ready (i.e., no app to be installed). Make sure to bring your laptop, or tablet, or smartphone so that you can have hands-on experience!

Sunday, March 10, 2019

Dormant application of fungicide(s)

At this time of the season, I am often asked about an application of fungicide(s) to dormant vines. I totally understand that you want to do something before things get busy.

A dormant application of lime sulfur (10% in our study, or 1% of a newer product called Sulforix in a study done by Dr. Annemiek Schilder at Michigan State Univ.) should be effective against Phomopsis and/or Anthracnose. We also tested cupper, but it was not effective. However, the efficacy of the application is not strong enough to allow you to skip any preventative fungicide applications to be sprayed soon after bud break. (i.e., even with a dormant application, you still need to protect your shoots when they emerge.) With the corrosiveness of lime sulfur, I feel that it is not worse the money and time, plus, it will be another application of a fungicide, which we try to reduce. It is much effective to spray mancozeb or captan soon after bud break. Thus, I would recommend a dormant application of lime sulfur only if you have a serious issue of Phomopsis and/or anthracnose and you need an extra kick to your regular preventative application after bud break.

The dormant application is less likely very effective against downy or powdery because both are called polycyclic diseases with a rapid secondary cycle. Even if you knock down the initial inoculum, they can produce next round of spores rapidly especially under favorable conditions. Also, the winter survival structures of these pathogens are very tough, so, I don't think fungicide application is the best approach.

Tuesday, March 5, 2019

EPA is reviewing captan

Captan, which we use extensively to manage downy mildew, Phomopsis, ripe rot, and other grape diseases, is currently under review by the EPA. In order to keep captan as one of our tools to control grape diseases, please respond to the EPA's registration review page to post your comment (will open the EPA page). With increasing cases of fungicide resistance with newer products in our region, it is very important for the majority of commercial grape growers located east of the Rockies to keep older multi-site materials such as captan to be used as a backbone of the spray program. 
Also, please forward the message to other producers and stakeholders who should respond to the need for this fungicide in our industry.