Abstract
Foliar insecticides were compared with an untreated check for SBA control at the Michigan State University, Saginaw Valley Bean and Beet Farm, Saginaw. Soybeans were planted in 30 inch rows on 5 May 2005, at a rate of 148,000 seeds per acre. Plots were 10’ × 25’ and treatments were replicated three times in a RCB design. Foliar treatments were applied using a CO2 pressurized backpack sprayer with twin jet nozzles at 40 psi and 23.8 gpa. Insecticide application timing was based on SBA surpassing the threshold of 250 SBA per plant (14 Jul). Pre-treatment whole-plant SBA counts were taken on 13 Jul, sampling 24 plants over the entire trial. SBA numbers averaged 830 SBA per plant at the R2 growth stage at this time. Whole-plant SBA counts, 5 plants per plot, were taken 4 (R3), 7 (R3), 14 (R4), and 21 (R4) DAT. Yield was taken with a Hage 125B small plot combine with a five foot grain head. All products were registered for use on soybeans in Michigan except Assail, Centric, Leverage and Trimax. Data were transformed prior to analyses by log10 (x + 1.0); untransformed data are presented. Data were analyzed using ANOVA and LSD (P = 0.05).
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