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Spray Guidelines to Manage Fungicide Resistance

Laura McDermott, Team Leader, Small Fruit and Vegetable Specialist
Eastern New York Commercial Horticulture

May 11, 2018

moldBotrytis cinerea, the causal agent of gray mold on strawberry, on infected fruit.
Note dusty covering of gray spores on infected fruit. Courtesy of APS image database: IW000098

Written by Dr. Cassandra Swett

Here's a strawberry spray guide that manages fungicide resistance, when your main objective is gray mold (Botrytis) protection:

Pre-bloom (crown rot protection)

Spray: Every 7-10 days

Rotating: Captan 50 WG or 80 WDG (group M)

With: Rovral 50 WG (Group 2) --this compound can only be applied once, and only pre-bloom

Early Bloom (10%) to fruit set

Spray: Every 7-10 days

Rotating: Elevate 50 WDG (group 17), CaptEvate (group M + 17), Switch 62.5 WG (group 9 + 12), Fontelis* (group 7), Scala (group 12) and Pristine WG (group 7 + 11)

With: Captan or Thiram Granuflo+ (both group M)

An example: Captan+Fontelis*, then Switch, then Captan, then Pristine, then Thiram+, then Elevate, then Captan

After fruit set:

Spray: Every 7-10 days

Rotating: Captan and Thiram+ (both group M)

With: CaptEvate (group M + 17), Elevate (group 17), or Fontelis* (group 7) -each applied only once during this interval.

Rates

For every compound, there is a range in the rate you can apply. For fungicides at risk of resistance (Switch, Pristine, Rovral, Scala), the lower rate is always recommended. For fungicides that are not at a high chance of resistance (Elevate, Fontelis*, Captan, Thiram+), the amount you apply should be adjusted, in part, based on how high disease pressure is. If it rained at least once since your last spray, and temperatures are between 65 and 75⁰ F, you will want to use the higher concentration. If, in contrast, it's been cooler than 65, warmer than 75 and / or dry, use the lower rate.

Timing

The same goes for how often you spray. We get a lot of rain this time of year, and every time it rains the fungus has a chance to infect plants. So long as it's raining about every week, plan to spray every 7-10 days.

Tips

  • Control is improved when you rotate between Fontelis* and Switch and when you tank mix Fontelis with Captan.
  • One of the compounds in Pristine is the same FRAC group as Fontelis*, so don't use these sequentially.
  • Switch and Pristine are both highly effective, but are at high risk of resistance if they are used too often. Because of this, it is recommended that they are only used ONCE each year.

What about non-synthetic chemicals?

There is some interest in using non-synthetic chemicals for fruit rot control, as a rotation with synthetic chemicals, especially in post bloom control, and for organic management. One such compound is Regalia, a plant extract labeled for use on gray mold and anthracnose fruit rot in strawberry. Trials are lacking for strawberries, but in grape Regalia can be as effective as Pristine against Colletotrichum, and is moderately effective against Botrytis. In trials in California, disease control with Regalia is best when rotated with conventional compounds. We will be doing work on strawberry starting this year to evaluate Regalia and other bio-pesticides / biologicals, so we should have more information on this in future years.

*Fontelis is not labelled in NYS.

+Thiram Granuflo is labelled but is NOT listed in the 2015 Cornell Pest Management Guidelines for Berry Crops.

Source: Penn State Extension, Small Fruit Blog http://extension.psu.edu/plant...

 

This article is from the April 11, 2018 CCE ENYCHP Berry News, Click Here for the FULL NEWSLETTER



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Upcoming Events

High Tech Precision Orchard Spraying

July 20, 2020

Join us the afternoon of July 20th to learn what's new in orchard precision spraying technology. We'll be joined by Dr. Jason Deveau, Dr. Heping Zhu, and Steve Booher.  After their presentations, we will open up the meeting for all three presenters to field questions and comments. 

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Announcements

U-Pick Farm Practices During Covid-19 Pandemic

U-Pick is a critical direct marketing approach for many of our farms and provides
customers with a unique connection to fresh produce grown close to home. In light
of what we understand about the spread of COVID-19, new management practices
will be needed to protect your farm team and your customers. This document
provides recommended practices and communication strategies for U-Pick
operations for the 2020 season.

https://rvpadmin.cce.cornell.edu/uploads/doc_864.pdf

Resources from CCE ENYCHP!

We are developing new ways to connect with the CCE ENYCHP team this year! We have a Youtube page located at this link. Check out videos on Table Grape Production, Pest Updates and the 20 Minute Ag Manager - in 4 Minutes series

We have a Facebook Page here as well as an Instagram page. We keep these places updated with current projects, events, and other interesting articles and deadlines.

There are also text alerts available. Fruit and vegetable farmers in 17 Eastern NY counties can now receive real time alerts on high risk disease and pest outbreaks texted directly to their cell phone. The Eastern NY Commercial Horticulture program, which is supported by local Cornell Cooperative Extension associations, will now offer text alerts to those that enroll in our program in 2019. 

The text alerts will be reserved for important crop alerts that could impact management decisions immediately. For instance, if there were an outbreak of Late Blight in the area, this would be transmitted to vegetable growers.

Farmers can choose the crop for which they wish to receive updates. Additionally they can request that Ag Business Alerts be sent to them. These alerts might include due dates for crop insurance deadlines, market opportunities etc.

If you have questions, please contact enychp@cornell.edu


Podcasts

2020 Biweekly Vegetable News Podcast - Episode 6 7/1/20

July 2, 2020
The July 1st, 2020 edition of the Eastern New York Vegetable News covers the following topics:

Cucurbit Downy Mildew Update (1:05)
Changes to the Paycheck Protection Program (9:10)
Managing Caterpillar Pests in Brassicas (12:53)
Strawberry Renovation (17:56)
Developing a Safety Plan to Comply with NY Forward Phased Re-Opening Requirements (24:12)

Here are links to additional resources mentioned in the episode:

NY Forward Safety Plans
Introductory “how to” video for writing your plan:
https://www.youtube.com/watch?v=V2PH3wCgdhc&feature=youtu.be

Cornell Agricultural Workforce Development NY Forward business safety plan support for farms
https://agworkforce.cals.cornell.edu/ny-forward-business-safety-plan/
• Plan templates
• Guidance and considerations for plan writing
• Links to “how to” videos
• Links to additional resources such as log templates, hand washing station plans, and more
• Webinar recordings

NYS Department of Agriculture and Markets novel coronavirus page: Guidance documents for farm businesses in multiple languages
https://agriculture.ny.gov/coronavirus

Strawberry Renovation
For more in-depth information re: strawberry renovation, visit http://www.hort.cornell.edu/fruit/nybn/newslettpdfs/2014/nybn1306.pdf.

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