Control of Mexican Bean Beetle in Soybeans with Systemic Insecticides, 1978

Soybeans were planted June 12’78 with a conventional 4-row unit planter equipped with Gandy (R) granular insecticide applicators. Except for Furadan 10G which was applied in the seed furrow, all other treatments were applied in a 6-8 inch band over the seed furrow, behind the press wheel. Two drag chains were attached behind the press wheel of each planter. Plots consisted of 4 rows (2 rows soybeans and 2 rows snap beans), 50 feet long with 30 inches between rows, arranged in a randomized complete block design with 4 replications. The 2 outside rows of each plot were planted with ‘Lake Superior’ snap beans to encourage an infestation of Mexican bean beetles. No insecticide was applied to the snap beans. Soil was classified as a Bertie silt loam and the soil temp at the time of treatment was 72°F at the 4 inch depth. At early pod-fill 10 plants were selected at random in each plot. Each plant was rated visually to the nearest 10% defoliation. Yield data were taken from 1 row, 16 ft long, in the center of each plot. Yields were adjusted to 13% moisture and reported in bu/A. Rainfall was above normal during the growing season.