This test was conducted on the University of Minnesota, Rosemount Experiment Station, in snap beans planted 2 Jun. Plots consisted of three 30 ft (9.14 m) rows on 30 inch (0.76 m) centers. Two untreated border rows and 7 ft (2.13 m) alleys separated the plots. Treatments were arranged in a split-plot design with four replications. Insecticide treatments were assigned to whole plots, while infestation timings consisted of single-row sub-plots within each whole plot. Treatments were applied 12 Jul using a moderate-clearance Spirit sprayer with 7 TX-10 hollowcone nozzles delivering 27 gpa (252.5 liter/ha) at 50 psi (3.51 kg/cm2) and 3 mph (4.8 km/hour). Plots were manually infested with ECB using a ‘bazooka’ applicator on 8, 15 and 19 Jul, corresponding to bud stage (72%), bloom (63%), and pod growth stages (75% at 0.5-3 inch length), respectively. On each infestation date, eleven consecutive plants in one row of each whole plot were infested with approximately 75 first-instar ECB larvae/plant. Infestations were designed to evaluate the activity of each material 4-d pretreatment, 3-d posttreatment and 7-d posttreatment. Beans were planted so that peak flowering would occur between the first and second generation ECB flights; feral ECB moth flights during this time were low. All treatments were evaluated 8 Aug by selecting five consecutive plants from the center of each infested row. Total pods, pods with feeding damage, stalk damage, and total ECB larvae were recorded.
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