Aerial Application of Insecticides for Second Generation European Corn Borer Control, 1993

Abstract

Abstract Insecticides were aerially applied to natural ECB populations in 2 fields near Pleasantville, IA, using an Ag-Cat airplane. Treatments were replicated 3 times in each field in a randomized complete block design. Liquid formulations were applied in one gallon of water per acre. Pretreatment counts of egg masses on 12 Aug indicated 7 egg masses per 50 plants in Field 1 and 23 egg masses per 50 plants in Field 2. Plant stage on this date was brown silk (Field 1) and green silk (Field 2). Insecticides were applied on 19 Aug; the 2nd application for the split Penncap M treatment was made 31 Aug. Treatments were evaluated on 2 and 4 Oct by splitting stalks, ear shanks, and removing the husks from 10 plants in the center row of each plot (center of the spray swath) and counting live larvae. Yields were taken on 4 Oct from the center six rows (Field 1) and on 14 Oct from the center 4 rows (Field 2) of each plot with a combine. Yields were measured with a weigh wagon, adjusted to 15.5% moisture and number 2 corn, and converted to bu/acre. Yield plot sizes were 0.35 acre (Field 1) and 0.52 acre (Field 2). Data were analyzed by using PROC ANOVA or PROC GLM procedures of SAS. Mean separation was accomplished using Fisher’s protected LSD procedure (P = 0.10).