Seed applied insecticide efficacy against the Soybean Aphid (Aphis glycines) and Bean Leaf Beetle (Cerotoma trifurcata)
Summary
During 2004, Gaucho and several formulations of Cruiser applied to seed, and foliar applications of Warrior were compared on two planting dates at the University of Minnesota Southwest Research and Outreach Center, Lamberton, MN.
Treatments consisted of insecticide untreated, cruiser applied to seed at 50 grams/100kg seed, with and without a foliar application of warrior at 3.2 fl. oz/acre targeted against soybean aphid, Cuiser at 0.0757 mg/seed, and as a prepak formulation with Apron+Maxim, gaucho at 62.5 grams/100 kg seed, Warrior at 3.2 fl. oz./acre applied early (VC), at soybean aphid treatment threshold (peak soybean aphid population), and as needed to maintain a bean leaf beetle and soybean free treatment through the growing season.
Under low 2004 soybean aphid and bean leaf beetle populations no difference in soybean growth or yield were observed among treatments. Both planting dates yielded similarly. The yield of insecticide untreated plots was somewhat less than those receiving a seed or foliar insecticide applications in the late planting date. However, the low yields were limited to of the two untreated plots. These yield differences were not statistically significant and did not appear to be related to insect infestations or the components of soybean yield that were measured.
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Created 12/1/04 by B. Potter with assistance from M. Werner.