Foliar Sprays on Late-Planted Sweet Corn, 1988:

Abstract

Abstract ‘Silver Queen’ sweet corn was planted 11 Jul to a Sassafras sandy loam field. Plots were 4 rows wide on 30-inch centers and 25-ft long. Whorl sprays were applied with a self-propelled, high-clearance sprayer with one nozzle centered over each of the middle 2 rows calibrated to deliver 51 gal/acre at 40 psi operated at 2 mph. Foliar sprays at silking were applied with 4 nozzles/row, directed at the ear zone, using 88 gal/acre at 40 psi operated at 2 mph. The center 2 rows of each plot were treated and the outer 2 rows were untreated guard rows. Sprays were applied on 23 Aug and 13, 16, 18, 22, and 26 Sep. At harvest (30 Sep), 20 ears from the center 2 rows of each plot were husked and evaluated for damage as “fresh-market” (clean ears, no damage evident), “processing” (evidence of tip feeding, but less than 3.6 cm tip damage) and “culls” (tip damage beyond 3.6 cm to the side or bottom). All worms found within the husk or ear were identified, counted and recorded; all ears were then weighed and total weights recorded. On 31 Oct, 20 stalks from the center 2 rows of each plot were split from 3 nodes above the ear to 3 nodes below the ear and each 2.5 cm of ECB damage recorded as one cavity.