Corn Insect Pest Management with Selected At-Planting Insecticide Treatments, 1994

Abstract

Abstract The insecticidal efficacy, effect on plant growth and corn seed yields of selected treatments applied as in-furrow sprays at planting (IFSAP), in-furrow granules at planting (IFGAP), and T-banded granules (T-BAND) were compared to that of an untreated control. Plots consisted of 4 rows (40 inch centers) × 45 ft. Treatments were arranged in a RCBD with 4 replications. Corn was planted no-till in a Gigger silt loam (pH = 5.9, 1.1% organic matter) on 23 Mar with a John Deere 7300 planter modified to apply treatments through a granular applicator hopper box or as a directed spray into the seed furrow. IFSAP treatments were applied with a CO2 charged system calibrated to deliver 5 gal total spray/acre through 8002E flat fan nozzles (1/row) at 40 psi. Numbers of chinch bugs were recorded on 2 May by sampling 20 plants in each plot. Plant stand density was measured on 16 May by sampling the entire 2 center rows of each plot. Plant height was determined on 23 May by taking an average of 20 plants/plot. Yields were measured by harvesting the 2 center rows of each plot on 16 Aug. The entire test was furrow irrigated throughout the season and rainfall was not a factor influencing final yields.