Featured Article | GreenCast | Syngenta

It’s almost large patch time… again?

By Lane Tredway, Ph.D., technical services manager, Syngenta

With the cool, wet weather we had during the spring of 2020, large patch activity was observed well into May or June in many locations throughout the south and transition zone. That could mean a short summer vacation for Rhizoctonia solani, which could be back in action by August or September with the right weather conditions. Now is the time to begin planning for preventive applications for this fall.

Protecting warm-season grasses from large patch through the fall and spring requires a powerful, long-lasting fungicide, and few products are up to the challenge. Syngenta is proud to introduce Ascernity® fungicide, an impressive option for large patch prevention that is now the cornerstone of our updated GreenTrust® 365 Large Patch Assurance Program.​​​​​​​​​​​​​​
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​​​​​​​Download the large patch assurance
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Ascernity combines the advanced SDHI technology SOLATENOL® (benzovindiflupyr) with difenoconazole, the proven cooling DMI. This innovative solution makes Ascernity particularly strong against Rhizoctonia diseases like large patch, but also delivers excellent control of brown patch, anthracnose, dollar spot and many other diseases.

University of Arkansas Large Patch Trial

Source: Dr. Mike Richardson, University of Arkansas, 2015. Study performed on Cavalier zoysia matrella greens, 2014-2015. Three applications were made on Sept. 23, Oct. 20 and April 9, 2015. 

Two fall applications followed by one spring application of Ascernity, all at 1 fl. oz./1,000 ft.2, have delivered outstanding control of large patch in trials throughout the south and transition zone. Compared to current standards, Ascernity delivers more consistent and longer-lasting control, both essential characteristics of a successful large patch product.

Large Patch Trials

Summary of eight trials in Arkansas, Georgia, Missouri, Mississippi, South Carolina and Tennessee, 2015-2016. Trials performed on zoysiagrass and seashore paspalum. Treatments made preventively. Two applications were made in the fall on 28-day intervals, plus one application was made in the spring. Rates per 1,000 ft.2.

For more information on large patch, visit GreenCastOnline.com/DiseaseGuide/Large-Patch.

"We’ve seen consistent results with Ascernity, year in and year out, and that’s one of the most important things for superintendents that are trying to manage this disease. They just can’t have failures and breakdowns with their fungicide programs. That’s where Ascernity shined in our trials."
- Mike Richardson, Ph.D., professor at the University of Arkansas
Sign up for large patch alerts
With the right product used at the right timing, Syngenta can help you to deliver excellent turf quality and playability through the fall and spring with our GreenTrust 365 Large Patch Assurance Program. To help optimize the timing of large patch applications this fall, check out our Soil Temperature Maps on GreenCastOnline.com or sign up to receive email alerts when soil temperatures become favorable for disease activity in your location.



All photos are either the property of Syngenta or are used with permission.

Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations. Trials reflect treatment rates commonly recommended in the marketplace.


©2020 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties and/or may have state-specific use requirements. Please check with your local extension service to ensure registration and proper use. Ascernity®, GreenCast®, GreenTrust®, Headway®, SOLATENOL® and the Syngenta logo are trademarks of a Syngenta Group Company.

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