No. 14 Article 7/June 29, 2007

Tracer Insecticide Labeled for Control of Armyworms in Grass Pastures

We recently were reminded that Tracer, an insecticide manufactured by Dow AgroSciences, is labeled for control of armyworms in grass pastures. In previous articles in the Bulletin, we failed to mention this alternative. Given the potential threat posed by armyworms to grasses in Illinois, an inclusion of all potential options for control is appropriate.

Tracer is a "broad-spectrum insect control product for cotton, field corn, sorghum, soybeans, small grains and tobacco" with the active ingredient spinosad, a combination of metabolites from the soil actinomycete Saccharopolyspora spinosa. The use rate for control of armyworms in grass forages, grass grown for seed, pastures, and rangeland is 1 to 2 fluid oz per acre. The label indicates to "treat when economic thresholds are exceeded, targeting eggs at hatch or small larvae." This recommendation is a bit impractical for armyworms in grass pastures, so the label further states, "Use a higher rate in the rate range for heavy infestations or advanced growth stages of target insects."

In the event that armyworms threaten grass pastures, as referenced in the article "Increase Vigilance for Armyworms" (issue No. 13, June 22, 2007, of the Bulletin), add Tracer to the list of products that can be used.--Kevin Steffey

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