Friday, February 26, 2021

Fungicide application template, a table of fungicide resistance, and upcoming meetings

I have updated my fungicide application template that I have been using for my fungicide guides. If you are interested in it, download it from this link. This will open a new Google Doc page, which says it is "View Only"; however, you can download the file. Select "File" from the top menu of Google Drive, and you will see the "Download As" submenu which has several options for the file type.

Many thanks to Mr. Bob Romsey who shared the original template with me!

Please note that this is just a template. Your program will differ based on what you see in your vineyard(s). Please use it with VCE's Pest Management guide or Southeastern IPM guide (linked under "Resouces"). Speaking of the Southeastern IPM guide, I created modified tables that consist of a list of commonly used fungicides in the vineyard with their FRAC codes and fungicide resistance risks, and a template for the spray program. I hope these materials will help you organize your spray schedule.

Although these are useful, please check our new pesticide management tool, grapeIPM.org, which will not only help you plan spray schedules but also, allows you to share your plan with your co-workers and print out postings for the WPS standard. It has helped me quite a bit of time and effort to organize my sprays for sure!

We are also planning to have several meetings in March and April. All will be online events.

March 16th: Grape IPM workshop 
March 31st: Grape disease management workshop (in English)
April 1st: Grape disease management workshop (in Spanish)
April 9th: GrapeIPM.org (online pesticide management tool) workshop

In the grape disease management workshops on 3/31 and 4/1 and grapeIPM.org workshop on 4/9, I will provide you a series of online lectures that you can watch before the meeting. At the meeting, I will go over the key items, and we will spend most of the time with Q and A and discussions. I will post more information and ask Tremain to distribute information once we have set time and format, so, please stay tuned.


Wednesday, January 13, 2021

Presentation slides from today's virtual meeting, and upcoming meetings

Thank you to those of you who were able to join our virtual meeting today.

Please click this link for a copy of my presentation (will open a new window with a pdf file).

The link to the trunk disease web application is here (will open a new window).

There was a discussion in the chatbox on Topsin-M's new federal label, which includes the paint and spray application to pruning wounds. This means that you no longer need to use the special (18c) label for the dormant application. Please click this link to download the new label for your record (will open a new window), if you wish to use Topsin-M to protect pruning wounds. The label has been approved by the VDACS for use in Virginia. If you have vineyards in other states, please check with the local extension office.

The list below shows upcoming meetings in the next few months. We will come up with dates for IPM workshops soon.

Eastern Viticulture and Enology Forum 

Cornell and Penn State Extension are teaming up to create the Eastern Viticulture and Enology Forum – a monthly webinar series that will bring you the latest in research results in viticulture and enology, with a focus on concepts that underlie the practical aspects of growing grapes and making wine.

Next Webinar: January 20, 2021

Grapevine Nutrition: Nutrient Requirements, Tissue Tests and Mycorrhizae

Dr. Paul Schreiner, Plant Physiologist, USDA ARS, Corvallis, OR.  

Registration: https://extension.psu.edu/grapevine-nutrition-nutrient-requirements-tissue-tests-and-mycorrhizae

For a list of upcoming Webinars from Cornell and Penn State:  https://cpb-us-e1.wpmucdn.com/blogs.cornell.edu/dist/3/7313/files/2020/12/Schedule-Eastern-Viticulture-and-Enology-Forum-Final.pdf 

Wine Sensory Analysis Workshop

Sensory session co-hosted by Dr. Beth Chang, Virginia Tech enology extension specialist, and Dr. Joy Ting, Virginia Winemakers Research Exchange research enologist 

Workshop Sensory Session:

Thursday, January 21st, 2 - 3:30PM -- RSVP: https://virginiatech.qualtrics.com/jfe/form/SV_6hY6SLqAgEwVRkh 

For the sensory sessions, we kindly request a limit of 1-2 representatives per winery. This is a modified version of the program previously held on 12/11/19. Participants will need to procure grocery store items (~$10).

We thank the Virginia Wine Board for funding this initiative.

If you are in need of special services to participate in this activity, please contact Beth Chang at eabc@vt.edu to discuss accommodations at least 5 days prior to the event.

Virginia Vineyards Association, Virtual Winter Technical meeting

VVA Winter Technical Meeting Set for Feb. 25-26

Due to the pandemic, the VVA Board has decided to move the 2021 Winter Technical Meeting from an in-person meeting to a two-day virtual one. The upcoming meeting will be held Feb. 25 and 26. The annual gathering is typically held every February and is attended by wine grape growers, educators, viticulture experts and vendors. The VVA Board is currently in the planning stages regarding the agenda and technical details, and will communicate more to the VVA membership in early winter. Meeting registration will open in mid-January. Check the website and your email for updates.  https://virginiavineyardsassociation.org/ 

Grape Disease Management Workshops, Spring 2021 (late March ~ early April)

In addition to the one to be offered during the VVA meeting, we are planning to have one grape IPM workshop, one grape disease workshop, and one grapeIPM.org training workshop. Keep posted for details.  

Friday, December 18, 2020

Upcoming webinar on January 13th, 2021

Tremain and I will be participating in an upcoming webinar on January 13th, 2021, which is hosted by PSU. It will start at 10 AM, and we are planning a 2-hour meeting to cover pruning related topics. Please join us, if you have time. You need to register to receive an invitation.

https://extension.psu.edu/dormant-grapevine-pruning-workshop-and-commercial-grower-panel

Also, please take some time to answer our survey on ripe rot!

Tuesday, December 8, 2020

Ripe rot (Colletotrichum) grower survey

Dear all, 

If you have a moment, please fill in the survey below. A team of researchers, including myself, is working on a new grant proposal to develop management strategies against various fruit rots including grape ripe rot, which is caused by a series of Colletotrichum fungi. 

The aim of this survey to determine what we need to focus our research effort. The project aims not only grapes, but other crops, so, please enter your input so that voices from grape growers will be heard.

Thank you in advance for your time. It should not take more than 5 min.
 
 


Best,
Mizuho

Thursday, November 12, 2020

Wednesday, October 7, 2020

In preparation for Hurricane Delta


Hurricane Delta seems to impact our regions, starting Saturday (10/10), and rain may last until Tuesday (10/13) or so. Depends on your location and cultivar selection, you may have some grapes that may need more time before harvest. (A link to Hurricane Delta tracker from Weather.com - will play a video.)

The target diseases right now are late-season fruit rots (Botrytis, ripe rot, bitter rot, etc.) and downy mildew (on leaves).

The links here are the presentation slides from the last viticulture meeting that covers some of the diseases mentioned above and a list of short PHI materials for Botrytis, powdery mildew, and downy mildew, which may help you decide what to do.

If you decided to wait until the storm is over, there are several materials with a very short PHI that you may want to consider, such as Oso/Ph-D or Elevate for Botrytis and a phosphorous acid (Prohyt, Phostol, etc.) or Lifeguard for downy mildew. FYI: when we tested in the field, Oso plus Double Nickel combination worked well against sour rot, and Switch works well against Botrytis and has a suppressive effect against sour rot (PHI = 7 days).

It may not be a good idea to spray captan, sulfur, and copper near harvest due to their potential negative impacts on the fermentation and wine quality. (but as usual, please assess your situations (vineyards, winery, economics, etc.) carefully.)