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Cucurbit Downy Mildew Update

Chuck Bornt, Team Leader, Extension Vegetable Specialist
Eastern New York Commercial Horticulture

July 25, 2018

As you may remember, a couple weeks ago Cucurbit Downy Mildew (CDM) was found in New Jersey and up until this week, most of eastern NY was under "low risk" of spores blowing in.  However, as you can see in the image from the CDM Forecasting System, the case for making sure you have fungicide coverage on all your cucurbits (especially cucumbers!) is all the more important! 

According to the forecast, eastern NY is under a "HIGH Risk"!  Regional Weather: Southeast / mid-Atlantic U.S: Rainy through the East Coast states. A stalled front in the East will be joined by a cold front moving in from the central U.S. Strong moisture feed from the south ensures more clouds and rain through mid-week. Some drying may occur from the west on Thursday. Highs in the 80s to low 90s, lows in the 60s and 70s.Overview: Epidemic spread likely in the East. Transport events move near-source and ... north / NW (Tuesday), north / NE (Wednesday), and northeast (Thursday). Conditions are favorable during a very large number of these events.  The last couple of years this program was been pretty accurate when it comes to determining when we saw our first CDM.  Usually within a week or so we were able to find CDM within the region.  This coupled with the current weather pattern is CDM's dream come true. 

Remember that cucumbers tend to be the crop most affected by this particular strain.  Look for yellow spots on the upper leaf sides on new growth and a grey/purple fuzz on the underside of the leaf where those yellow spots are located (Figure 2) - early morning under dewy conditions is the best time to find the fuzz on the undersides. For symptoms on other cucurbits go to http://cdm.ipmpipe.org/node/22 

 So what's this all mean?  It means that it is highly likely CDM is or will be moved into our region and your plants have been exposed to CDM spores.  If you haven't started your DM fungicide program it's time to start!  I've put together a list of fungicides labeled for CDM in Table 1.  The good news, if there is any, is that conventional growers have a new fungicide labeled this year for use that is highly effective on CDM call Orondis.  The active ingredient in Orondis is oxathiapiprolin and is the first in a new chemical group (FRAC code 49, previously U15).  It is highly effective for diseases caused by oomycetes (downy mildews, late blight and phytophthora blight).   

However there a few things to know.  First, there are three formulations of Orondis on the market:  Orondis Gold, Orondis Opti and Orondis Ultra.  Orondis Gold is labeled for soil applications and if it was used at planting, no foliar applications of Orondis are allowed!   If you did not use Orondis Gold, the other two formulations are labeled for foliar applications but again there are some differences.  First, Orondis Opti also contains chlorothalonil so if you use this one you will not have to add extra protectant.  However, for cucurbits it only has CDM on the label.  Orondis Ultra also contains mandipropamid the active ingredient in Revus and has CDM and Phytophthora blight on the label!  It would also need to have a protectant such as chlorthanonil or copper mixed in with it.  Additionally, for resistance management, no more than 2 consecutive applications of any Orondis fungicide are allowed; next application must be a fungicide that does not contain a code 49 active ingredient and also a code 40 when Orondis Ultra is used.  When at least 3 applications will be made, Orondis fungicides can be no more than 33% of the applications, or a maximum of 4 applications per planting, whichever is fewer.

Orondis Ultra or Opti are the first go to products, but if you suspect CDM and you don't have or can't get ahold of an Orondis product, my first choice would probably be Curzate or Tanos (as they have some kickback activity) but are short lived so it needs to be mixed with a protectant such as chlorothalonil and another translaminar fungicide such as Ranman, Zampro etc.  Please remember to rotate your fungicides!   I have given you the FRAC codes to help determine the different classes they belong too—do not apply products or pre-mix products from the same FRAC code back to back.  If possible, switch to a different one.  Please note that Previcur Flex and Presidio are no longer being recommend for CDM!

Organic options for DM:  There are a number of organic materials labeled for Downy mildew, but for the most part many of them have not shown very good efficacy in most trials.  If applied before the disease is started copper remains one of the better choices.  Other options include Double Nickel 55 Biofungicide, Regalia Biofungicide, Actinovate AG and OxiDate 2.0.





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Upcoming Events

June Produce Field Meeting

Event Offers DEC Credits

June 5, 2024 : June Produce Field Meeting
Fort Plain, NY

Come join us for a discussion on greenhouse production, IPM techniques in the greenhouse, and a discussion of IPM strategies for tomatoes, cole crops and cucurbits. 

Meeting is free and open to the public.

2 DEC credits in categories 1A and 23 are available. 

View June Produce Field Meeting Details

Weed Management in Perennial Fruit Crops - Field Workshop

Event Offers DEC Credits

June 20, 2024 : Weed Management in Perennial Fruit Crops - Field Workshop
Tivoli, NY

Join us on the morning of June 20th as we hear from Cornell University weed management specialists Dr. Lynn Sosnoskie and Dr. Yu Jiang, who will discuss their recent research on autonomous orchard weeding systems.  

We will also hear from Mike Basedow of CCE ENYCH and learn about the ongoing results of herbicide research trials he is conducting.  Bryan Brown of NYS IPM will discuss pre-plant preparations and mulches that could be useful for controlling weeds without herbicides.   

Identifying the differences between weed species and key differences between annuals and perennials that factor into management will also be covered.     

This workshop is FREE to attend, but we ask that you please register ahead 

View Weed Management in Perennial Fruit Crops - Field Workshop Details

Champlain Valley Orchard Weed Management Field Trial Review

Event Offers DEC Credits

June 21, 2024 : Champlain Valley Orchard Weed Management Field Trial Review
Peru, NY

Friday June 21, 9-11:30AM

Meet at the Northern Orchard Walker block at 688 River Rd, Peru, NY

Join the ENYCHP on the morning of June 21st as we hear from Dr. Lynn Sosnoskie and Dr. Yu Jiang about their recent research looking at autonomous orchard crop management and weeding technologies.   We will then visit three of Mike's active herbicide research plots to see firsthand the level of control the trial treatments are providing during the critical weed free period. 

2.5 DEC Credits are available for this meeting in categories 22, 1A, and 10. Free to attend, but we ask that you please register ahead 

View Champlain Valley Orchard Weed Management Field Trial Review Details

Announcements

2023 Spotted Wing Drosophila Monitoring/Management

All berry farmers are watching for monitoring reports that indicate Spotted Wing Drosophila (SWD) adults are in their region. Mid-season berry crops should be sprayed as soon as berries begin to ripen unless you've elected to use insect exclusion netting.

- For general information about SWD, and to enroll for free monitoring reports, visit the Cornell SWD blog https://blogs.cornell.edu/swd1/.
- Click here for the 2023 Quick Guide for Pesticide Management. 
- For some great instructional videos and fact sheets on insect exclusion netting, visit the University of Vermont's Ag Engineering blog.


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

Winter Greens Grower Interviews in Northern New York

October 22, 2022
In this episode, vegetable specialist Elisabeth Hodgdon interviews Lindsey Pashow, ag business development and marketing specialist with the Cornell Cooperative Extension Harvest New York team. They discuss findings from a series of interviews with winter greens producers in northern New York. Lindsey shares production and marketing challenges associated with growing winter greens in this cold and rural part of the state, success stories and advice from growers, and tips for those interested in adding new crop enterprises to their operation.

Funding for this project was provided by the Northern New York Agricultural Development Program. The episode was edited by Miles Todaro of the ENYCHP team.

Resources:
• Crop enterprise budget resources available from Penn State Extension (field and tunnel vegetables: https://extension.psu.edu/small-scale-field-grown-and-season-extension-budgets), UMass Extension (winter spinach budgets: https://ag.umass.edu/vegetable/outreach-project/improving-production-yield-of-winter-greens-in-northeast and field vegetables: https://ag.umass.edu/vegetable/fact-sheets/crop-production-budgets), and Cornell Cooperative Extension (high tunnel vegetables: https://blogs.cornell.edu/hightunnels/economics/sample-budgets-spreadsheets/). Use these budgets as templates when developing your own crop enterprise budget.
• The Organic Farmer’s Business Handbook, by Richard Wiswall
• The Winter Harvest Handbook, by Eliot Coleman

For questions about the winter greens project discussed in this podcast, reach out to Lindsey Pashow (lep67@cornell.edu) or Elisabeth Hodgdon(eh528@cornell.edu).

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