Maximize root growth this fall

By Lisa Beirn, Ph.D., technical services manager for Syngenta

Divanem® nematicide is labeled to treat Anguina in California.

While it’s important to manage root growth and plant health all year long, fall and spring are key times to grow roots in the south and transition zone, both in cool- and warm-season grasses. Nematodes are one of the key pests that can hamper root growth during these times. Plant-parasitic nematodes need living roots to grow and reproduce, so they are most active when the turf roots are growing. Although symptoms of nematode damage often appear during the summer, most of the damage was likely done weeks or even months beforehand.

Making fall applications

Fall applications of Divanem have been shown to increase root depth and density in turfgrasses infested with nematodes. Divanem has broad-spectrum activity against the most important turf nematodes, including Anguina, sting, root knot, lance and spiral, so it's a valuable component of any nematicide program.

Click here for sampling tips and to find a nematode sampling lab near you.

Broadcast rates of 12.2 fl. oz./A on a 21- to 28-day interval are effective for preventive applications or when initial nematode populations are low. Where populations are very high or turf damage has occurred, Divanem may be applied at a spot-treatment rate of 12.2 fl. oz./10,000 ft.2 on a 21- to 28-day interval. The spot treatment rate provides greater protection against high nematode populations and more rapid turf recovery as a result.

Multipak box conatining Divanem and HeritageActionDivanem is compatible with fungicides like Briskway®, Velista® and Heritage® Action™, which are also commonly applied in the fall to prevent key root diseases like spring dead spot and take-all root rot. Tank mixtures of Divanem with these fungicides consistently provide further enhancements in root growth and turf quality. Divanem is packaged with Heritage Action in a convenient Multipak that offers 10% savings.

For best results, Divanem should be tank mixed with a soil surfactant, applied to wet turf early in the morning, and watered-in immediately after application with 0.25 in. of irrigation. These steps are important to wash the active ingredient from the turf foliage and help it to penetrate through the thatch layer.

Source: Neil Young, Turfgrass Environmental Research, Inc., 2016. Applied four times on a 28-day interval (June 26, 2016, July 27, 2016, Aug. 21, 2016 and Sept. 30, 2016). Nematodes present: sting, lance and root-knot. Photos taken Sept.  27, 2016. Photo source: Neil Young. Fort Lauderdale Country Club in Plantation, Florida, 2016.

For more information about Divanem and nematode management, visit Nematode Knowledge or

Always consult the product label for complete use and application information.

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

© 2023 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. Divanem is a Restricted Use Pesticide. Action™, Briskway,®, Divanem®, GreenCast®, Heritage®, Velista®, the Alliance Frame, the Purpose Icon and the Syngenta logo are trademarks of a Syngenta Group Company. All other trademarks are the property of their respective third-party owners.

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