Managing tough summer diseases

By Mike Agnew, Ph.D., technical services manager, Syngenta

Agronomic programs from Syngenta are tailored by region and turf species based on local conditions. Using our research and experience, Syngenta has developed rotations and tank-mixtures that deliver outstanding turf quality and playability by managing these biotic and abiotic stresses.

Save on leading product combinations with convenient Multipaks.

Protection from abiotic stressors | Summer biotic stresses | Summer abiotic stresses | Webinar


Protection from abiotic stressors with the Syngenta portfolio

Syngenta offers a range of products that help boost a plant’s natural defenses against abiotic stress.

Turfgrasses are susceptible to many types of stress, and in the summer, they can be adversely affected by both biotic and abiotic stresses. Biotic stresses can be caused by plant pathogens, insects or nematodes. While plant pathogens are the most common, the type of biotic stress will depend upon geography, the host plant and its susceptibility to a particular stress.

Abiotic stresses can be synthesized or occur naturally. Although they are caused by numerous factors including ongoing wear from golfers and regular maintenance, abiotic stress increases drastically in the summer by two key stresses: drought and high temperature. Drought stress can result in leaf wilting and desiccation, leading to a loss of turf quality. High temperatures, classified as temperatures above 85° F, can limit both root and shoot growth (for cool-season turfgrasses, the optimum air temperatures for plant growth are between 65° F and 75° F). Managing turfgrass under these conditions can be difficult, but a sound agronomic program can help.

Summer biotic stresses (plant pathogens)

Four key diseases that impact summer stress on greens (in the transition zone and the North) include anthracnose, dollar spot, summer patch and brown patch. Fungicide selection is important for managing turfgrass when disease pressure is moderate to high.  To help you in selecting a fungicide based on a target disease, see our recommendations below or visit our efficacy ratings chart on our disease ID guide for efficacy on additional diseases.

For optimal disease control, especially for diseases like anthracnose, it is recommended to tank-mix a contact fungicide with a systemic fungicide.

Summer abiotic stress (drought and high temperature)

The Syngenta agronomic programs are proven and safe to turf when applied during summer.
  • Heritage Action, Daconil Action and Secure Action improve plant performance by affecting multiple physiological processes within turfgrass. They activate the plant’s own defense genes to mimic the systemic activated resistance (SAR) response of plants. For example, they manage stomatal regulation, which reduces water loss.

    • For more information about how Heritage Action, Daconil Action and Secure Action can condition your turf to perform at its best, visit

    • Daconil Action and Heritage Action can be purchased together in a Multipak, which contains 2.5 gal. of Daconil Action and 2 lbs. of Heritage Action.

  • Briskway is a DMI-containing fungicide that is safe for turfgrass in extreme temperatures.

  • Appear II controls diseases like Pythium and anthracnose, while enhancing color, turf quality and stress tolerance.

    • Daconil Action and Appear II can be purchased in a convenient Multipak that contains 1.19 gal. of Daconil Action and 2 gal. of Appear II.

  • Velista delivers excellent disease control during summer stress and is the broadest spectrum SDHI and the only SDHI to control anthracnose.

    • To provide optimal disease control, Velista is available as part of the Heritage Action + Velista Multipak, which contains 66 oz. of Velista and 3 lbs. of Heritage Action.

To combat summer stress, Syngenta offers products packaged in convenient Multipaks. From left: the Daconil Action + Heritage Action Multipak, Daconil Action + Appear II Multipak and Heritage Action + Velista Multipak.

Rutgers University, 2018


For more information on the agronomic programs recommended for your region, view the following Syngenta-sponsored GCSAA webinar titled “Agronomic Programs: Managing Plant Stress and Disease Management.”

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 and mixing partners commonly recommended in the marketplace.

© 2022 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™, Appear®, Ascernity®, Briskway®, Daconil®, Heritage®, Posterity®, Primo Maxx®, Velista®, and the Syngenta logo are trademarks of a Syngenta Group Company. Secure® is a registered trademark of Ishihara Sangyo Kaisha, LTD. All other trademarks used herein are the property of their respective owners.

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