Effect of Lannate in Varying Volumes of Finished Spray on Control of Fall Armyworm And Yield in Late-Planted Field Corn, 1985

Abstract

Abstract Field corn ‘Pioneer 3147’ was planted on 14 Jun at the Tobacco Experiment Station, Greeneville. Seven in-whorl treatments were replicated 4 times in a randomized complete block design. Plots were 20 ft × 4 rows with 5-ft alleys between blocks. Rows were 38 inches apart. Plant population was 25 plants/20 row ft. Lannate insecticide (0.45 lb Al/acre) was applied in 6 different finished spray volumes (3-30 gal/acre) on 17 Jul when 94% of the plants were infested with 3.35 larvae/plant. Sprays were applied using different nozzle sizes with a 2.5-gal compressed CO2 sprayer at a constant tank pressure of 30 psi. Dead larvae were counted on 18 Jul and percent mortality was determined. Newly damaged whorls were counted on 25 and 31 Jul. Ensilage yield was determined on 8 Oct at 52.38% moisture.