Featured Article | GreenCast | Syngenta

Keep your turf disease-free this fall with a program approach

By Mike Agnew, technical services manager for Syngenta

Every season of the year is fraught with its own list of diseases that can impact golf course management. Fall in particular can be problematic, especially where diseases like dollar spot, leaf spot and rusts are concerned.

Dollar spot

Warm days and cool nights that produce heavy dews are conducive for the development of dollar spot. However, taking steps to prevent fall dollar spot can help turf emerge healthier in the spring.

The key to dollar spot control is to plan preventive fungicide applications prior to a disease outbreak. Secure® Action™ and Posterity® fungicides are great options to help control dollar spot this fall. Secure Action provides the protection of a multi-site contact fungicide while Posterity delivers systemic control of dollar spot. The Fungicide Resistance Action Committee (FRAC) considers multisite fungicides to be valuable tools that manage resistance by delaying its development to many pathogens.

Two new fungicides to the Posterity family, Posterity XT and Posterity Forte fungicides, offer even more flexibility with three modes of action for keeping turf disease free this fall. Posterity XT provides control of diseases such as summer patch, anthracnose and take-all patch in addition to dollar spot. Posterity Forte is designed for extended dollar spot control in addition to brown patch and leaf spot diseases.  Posterity, Posterity XT or Posterity Forte can be simply incorporated into a fall disease program depending on the target disease(s).

2019 Dollar Spot B. Clarke, New Brunswick, NJ (Rutgers University) Crenshaw creeping bentgrass, FW HOC

Applications: May 25—Aug. 16; 14-, 21- and 28-day intervals

In terms of application timing, dollar spot can be controlled with properly scheduled fungicide applications starting after Labor Day. Secure Action applied at 0.5 fl. oz. per 1,000 ft.2 is labeled for control of dollar spot for up to 21 days, while Posterity Forte at 0.63 fl. oz. per 1,000 ft.2 can provide excellent control of dollar spot for up to 28 days. If take-all patch or other soil borne diseases are targeted in addition to dollar spot, Posterity XT at 1.5-3.0 fl. oz. per 1,000 ft.2 can provide broad spectrum disease control throughout the fall months. If extended dollar spot and leaf spots are of more interest, consider Posterity Forte during this time period at 0.42-0.63 fl. oz. per 1,000 ft.2. During weather conditions that are conducive for high disease pressure, it is recommended to shorten spray intervals to insure optimal disease control. Sign up for dollar spot alerts at GreenCastOnline.com to receive alerts for your area.

Bruce Clarke, Rutgers University, 2017. Secure Action was reapplied on September 15. All other treatments were reapplied on September 22, 2017.

Fall clean-up of leaf spot and rusts

While dollar spot may be the most important fall disease, other diseases that occur in the fall can adversely impact turfgrass health. Two diseases in particular can be problematic on golf courses: leaf spot and rusts.

Leaf spot:
  • Occurs in areas that experience more than 10 hours of foliar wetness a day for several consecutive days
  • Favors temperatures between 40° F and 80° F
  • Favors high amounts of nitrogen and a low mowing height

  • Favor moist, low-light areas
  • Favor temperatures between 65° F and 86° F, depending on the species
  • Severe rust infections occur on slow-growing turfgrass, particularly those with low nitrogen levels and/or plant water stress

Secure Action or Posterity XT, applied in early October, can provide excellent control of both leaf spot and rust.

To find an agronomic program tailored for your region, please visit GreenCastOnline.com/Programs or contact your local Syngenta territory manager.

Performance evaluations are based solely upon interpretation of public information and field observations. Trial reflects 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. Action™, GreenCast®, Posterity® and the Syngenta logo are trademarks of a Syngenta Group Company. Secure® is a trademark of Ishihara Sangyo Kaisha, LTD. All other trademarks are the property of their respective owners.

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