EFFICACY OF INSECTICIDE SEED TREATMENTS AGAINST LARVAL WIREWORM INJURY ON DRY EDIBLE BEAN, 2008

Efficacy of different rates of an insecticidal seed treatment was evaluated in controlling larval wireworm injury on dry edible beans in research plots at a cooperator site near Glyndon. Dry edible beans were planted on 21 May. Plots were 4 rows wide by 20 ft long with 30 inch row spacing. The experiment tested the efficacy of one high rate and one low rate of Cruiser 5FS seed treatment applied to navy and great northern beans, one high rate of Cruiser 5FS seed treatment applied to pinto bean, plus one untreated check for each bean variety for a total of eight treatments. All treatments included a fungicidal seed treatment consisting of Maxim 4FS, Apron XL 3LS, and streptomycin. The experiment was arranged in a RCB design with four replications. Treatments were evaluated on 25 Jun by randomly sampling a total of 10 plants from the center two rows of each plot. Larval wireworm root injury was rated on a scale of 0 to 10, with 0 having no injury and 10 having the most severe injury. The center two rows of each plot were harvested by hand on 26 Sep and plot yields calculated. Yield was adjusted to 12% moisture. All data were subjected to ANOVA and treatment means were compared using Fisher’s Protected LSD at the 5% significance level.