Corn Insect Pest Management with Selected Rates of Furadan 4F, 1994

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 control. Native winter vegetation was allowed to cover the test area. An application of 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 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 for Furadan 4F 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 22 Apr and 2 May by sampling 20 plants in each plot. Armyworm damage to plants was determined by recording all damaged plants on the center 2 rows of each plot 2 wk after plant emergence. 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 26 Aug. The entire test was furrow irrigated throughout the season and rainfall was not a factor influencing final yields.