Improvement of the residual activity of a cucurbitacin-based adult corn rootworm (Coleoptera: Chrysomelidae) insecticide
2001
Pingel, R.L. | Behle, R.W. | McGuire, M.R. | Shasha, B.S.
Areawide management of the corn rootworm, Diabrotica virgifera virgifera, focuses on managing adult beetles to decrease egg deposition. The primary management tool for this approach is a commercial bait composed of a feeding stimulant (cucurbitacin), inert ingredients, and a small quantity of insecticide. Cucurbitacin-based baits have had poor residual insecticidal activity that decreases efficacy and economic practicality. These studies were designed to extend the residual activity of 2 commercial bait formulations, Slam Prader and Slam SD, by adding materials as a tank-mixed adjuvant or as part of the formulation to prevent washoff by rain. Initial assays with Slam Prader identified low pH gluten and sodium lignate to have the greatest potential to provide rainfastness with a trend for less residual activity with higher concentrations (>2% of spray volume) of adjuvant. An additional assay demonstrated that low pH gluten was effective for resisting washoff by natural rain when added to the Slam SD as a formulation ingredient. Large-plot experiments conducted over 2 years (1997-98) in maize (cv. Golden Harvest 2344) fields in northwestern Illinois, USA failed to show a statistically significant advantage of gluten and lignin additives. For both years, all bait treatments provided adequate management of the adult corn rootworm for 3 weeks after application. Based on sticky trap counts, insecticide-treated plots maintained beetle populations below the economic threshold of 5 corn rootworms per trap per day and significantly below the corn rootworm density in the untreated plots.
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