Abstract
Abstract Granules are generally recommended over liquids for first-generation ECB. The comparative efficacy of liquid and granular insecticides was evaluated against an artificial ECB infestation established in a commercial corn field at the University of Minnesota, St. Paul, MN. Plots, measuring 1 row (76-cm centers) X 9.1 m, were infested in the late whorl stage; the middle 15 plants received 3 egg masses, 1 each on 18 Jul, 19 Jul, and 20 Jul. Whenever possible, granular and liquid formulations of the same active ingredient were used plus several standards lacking a granular or liquid counterpart. Treatments were arranged in a randomized complete block design with 4 replications. Granules were banded over the row on 22 Jul pm with a 1-row Gandy granular applicator. Liquids were banded over the row on 23 Jul am with a C02-powered backpack sprayer delivering 217 liters/ha using 8002 nozzles. Efficacy was evaluated from 27 Aug to 4 Sep by dissecting the 15 infested plants from each plot and counting both tunnels and larvae.
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