High Rate of Asana XL, Selected Insecticides and Microbials for European Corn Borer Control in Minnesota Sweet Corn, 1993

This test was conducted on the University of Minnesota Southern Experiment Station at Waseca in corn planted 4 Jun. Plots consisted of four 30 ft (9.14 m) rows on 30 inch (0.76 m) centers. Two untreated border rows and 6 ft (1.83 m) alleys separated the plots. Treatments were arranged in a randomized complete block design with four replications. A Hagie highboy sprayer with two flat fan (8002VS) nozzles/ row, delivering 35 gal/acre (327.4 liters/ha) at 33 psi (2.3 kg/cm2) and 2 mph (1.2 km/hr), was used to treat the ear zone of each row. A weekly spray schedule was initiated at 75% silk. Because of wet weather conditions, an 11 day treatment interval resulted between first and second applications. Treatments were applied 12, 23 Aug and 2 Sep. Plots were artificially infested with about 25 neonate ECB larvae/primary ear-leaf on 16 Aug. Treatments were evaluated 9 Sep by randomly selecting 25 ears/plot (100/treatment) and recording total ECB larvae, larval size, location and feeding damage.