Abstract
Abstract The insecticidal efficacy, effect on plant growth and corn seed yields of selected treatments applied as in-furrow sprays at planting (IFSAP) and in-furrow granules at planting (IFGAP) were compared to that of an untreated check. Native winter vegetation was allowed to cover the area in the test. Gramoxone X-tra (1.5 pt/acre) was applied 2 wk pre-plant to terminate all vegetation. All plots also received atrazine 4L (3.0 pt/acre) + Roundup D-pak (3.0 pt/acre) at planting. 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 3 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 for Furadan 4F mixed with the starter fertilizer (11-37-0) or starter fertilizer alone were applied with a CO2-charged system calibrated to deliver 5 gal total spray/acre through 8002 flat fan nozzles (1/row) at 48 psi. IFSAP treatments for Furadan 4F without fertilizer were applied with a CO2-charged system calibrated to deliver 5 gal total spray/acre through 8002 flat fan nozzles (1/row) at 40 psi. Numbers of chinch bugs were recorded on 22, 28 Apr and 2 May by sampling 10 plants in each plot. Armyworm damage to plants was determined by recording all damaged plants on the center 2 rows of each plot 1 wk after plant emergence. Cutworm damage to plants was recorded weekly for 4 wk after emergence and was determined by recording all damaged plants on the center 2 rows of each plot. Plant stand density was measured on 16 May by sampling the entire 2 center rows of each plot. Plant height was measured on 19 May by taking an average of 20 plants/plot. Yields were measured by harvesting the 2 center rows of each plot on 18 Aug. The entire test was furrow irrigated throughout the season and rainfall was not a factor influencing final seed yields.
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