Abstract
Abstract Efficacy of Penncap M 2 FM at 5 different timings was evaluated against second-generation ECB in a commercial production field at the Southwest Experiment Station in Lamberton, MN. The field, planted on 3 Jun to an 85 day RM variety, was tasseling and silking as the second generation moth flight peaked; it attracted significant egg laying (>2.5 egg masses per plant). Treatments were applied at 3-4 day intervals beginning 6 Aug to plots measuring 4 rows (76 cm centers) X 30 m. Treatments were arranged in a randomized complete block design with 5 replications. Applications were made with a Hagie Hi-Boy sprayer at 6.4 km/h delivering 174 liters/ha through 8002E drop nozzles. Application dates of 6, 9, 13, 16, and 20 Aug corresponded to ECB infestation predominantly in these stages: egg (15% hatch), egg and first instar (55% hatch), first instar (80% hatch), 2nd instar, and 3rd instar, respectively. Efficacy was evaluated on 18 Sep by dissecting 20 plants and counting tunnels in ear shank and stalk. Preharvest measurements of broken stalks, ear droppage, and % kernels damaged were made on 25 Sep. Plots were harvested by combine on 11 Oct and yields adjusted to 15.5% moisture.
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