Dollar Spot Solutions | GreenCast | Syngenta
Smith-Kerns Dollar Spot Prediction Model (Beta)

This tool is based on the model developed by Damon Smith, Ph.D., associate professor and extension specialist, University of Wisconsin-Madison, and Jim Kerns, Ph.D., associate professor and extension specialist, N.C. State University, et al. This model helps superintendents maximize resources by optimizing the timing of applications based on recommended thresholds for dollar spot development.

Input your zip code and select a date range below to see the dollar spot risk for your area.

Zip:

Dates:

High risk, consider tightened intervals, tank-mixtures, or increased rates to bolster protection
Elevated risk, continue preventive applications on prescribed intervals
Moderate risk, preventive fungicide applications necessary
Low risk, prepare for preventive applications
Sign up to Receive Alerts

Depending on cultural practices and turf type, the threshold for dollar spot can vary. Research used to develop the model showed that dollar spot symptoms could be prevented at the test site if applications were started before or when the risk reached 20%, and continued through the season. Beginning Feb. 1, 2019, you can receive alerts that predict when weather conditions are optimal for dollar spot in your area.


Posterity and Secure Action fungicides are the latest dollar spot control products in the Syngenta portfolio. Posterity, the most-active SDHI in the turf market, holds strong for up to 28 days of dollar spot control plus consistent control of spring dead spot and fairy ring. Secure Action includes a boost of acibenzolar-S-methyl (ASM) to protect against biotic stress, like dollar spot, and abiotic stress, like drought and heat.

Click on their respective logos below to learn more about them.

Dollar Spot Solutions in Action

Syngenta has thoroughly tested the performance of Posterity and Secure Action on golf courses and at research centers across the country. View the results, and watch interviews with independent researchers by clicking each marker below or clicking the arrows on the sides.



Agronomic Approach to Dollar Spot Control

When building an agronomic program, it is important to include multi-site contact fungicides like Secure Action or Daconil® Action™ as the foundation. It is also recommended to include fungicides with other modes of action like Briskway® or Headway® to manage resistance and control multiple pathogens, all season long. Below are sample programs to help you understand how to condition your turf to defend against dollar spot so it performs at its best and quickly recovers from biotic and abiotic stress.


Sample agronomic program for fairways
Sample agronomic program for fairways *Sample program represents rates used in 21-day agronomic program image above.
Sample agronomic program for greens
Sample agronomic program for greens

To find an agronomic program tailored to your specific region and grass type, visit our Interactive Agronomic Programs finder. Or contact your local territory manager to order an agronomic program poster for easy reference all season long.


SDHI Resistance Management

Over the years, generations of SDHI fungicides have been widely adopted because of their broad-spectrum control. However, it is important to understand that SDHIs are single-site fungicides that only attack one point in a pathogen. If the disease mutates, the pathogen can overcome the action of the fungicide and prevent the product from actively binding to it, which makes the fungi more likely to develop resistance.


To help combat this, we recommend the following best practices for SDHI resistance management:


  • Follow a Syngenta agronomic program that times preventive applications based on conditions that favor pathogen growth
  • Do not make more than two sequential applications of any SDHI
    • For diseases that are highly susceptible to resistance like dollar spot and anthracnose, rotate after each SDHI application.
  • Rotate and/or tank-mix Posterity or Velista® fungicide with low- or medium-risk chemistries that are not in FRAC Group 7
    • On greens, tank-mix and/or rotate Velista and/or Posterity with Daconil Action, Secure Action and Briskway fungicides
    • On fairways, rotate Posterity with Secure Action and/or Daconil Action
  • Make preventive applications, which are active before a pathogen is present. Curative applications with SDHIs can accelerate resistance development as more pathogens are exposed to the curative application than the preventative application.
  • If curative applications are required, Secure Action is an excellent choice for curative control for both efficacy and resistance management.

Dollar Spot Experts

Watch Lisa Beirn, Ph.D., research and development scientist at Syngenta, discuss her work surrounding the discovery of four new species of the dollar spot fungus.



Dollar Spot Solutions in Action


Jim Kerns, Ph.D. explains why he developed the dollar spot prediction model, and how it can help you make timely applications for dollar spot control. 



Dollar Spot Solutions in Action

Dollar Spot Webinar: New Research and Technology for Improved Control

Mike Agnew, Ph.D., technical services manager at Syngenta, shares critical information about Posterity and Secure Action fungicides. Lisa Beirn, Ph.D., also shares an update about her research on new species of dollar spot in turf and a new naming structure. Learn more about key resistance management strategies, and how to condition your turf so it performs at its best and recovers quickly from stress. Earn 0.1 GCSAA education points with this webinar.



Additional Resources

Syngenta enhances control of dollar spot and other turf diseases with new Posterity and Secure Action fungicides

In July 2018, Syngenta launched two fungicides for the turf market, Posterity and Secure Action, which deliver proven, long-lasting dollar spot control as well as other common turf diseases.
Read More >>



Identifying and naming the fungi that cause dollar spot on turf

Golf Course Management
New technology has allowed scientists to reclassify the pathogens that cause dollar spot in turf to a new genus and four different species.
Read More >>



Clarireedia: A new fungal genus comprising four pathogenic species responsible for dollar spot disease of turfgrass

Research from Lisa A. Beirn, Ph.D. and Lane Tredway, Ph.D., technical services manager for Syngenta, (et. al.) showcases how dollar spot pathogens have been reclassified into a new fungal genus including four pathogenic species. 
Read More >>