Abstract
Abstract One commercial 16-acre field, located near Potter, N.Y., was used for this test. Within the field 5 plots, each 40 ft wide by 900 ft long, were delineated. Within the center of each plot we marked a section of 100 plants in the early whorl stage. Into the whorls of each of the 500 plants, about 15 newly hatched FAW larvae (from a Du Pont-maintained Lannatesusceptible culture) were deposited on 15 Jul using a “bazooka” dry-grit Davis innoculator. On 21 Jul, each section was sprayed with 1 of 4 insecticides. A Schweizer Ag-Truck plane was used to deliver all treatments. Liquid insecticides were applied a 3 gal/acre, 35-40 psi with D8-45 nozzels and 115-120 mph. On 27 Jul 50 plants from each treatment were evaluated for the number of live FAW larvae. After this evaluation, 1 additional spray of EPN and 2 additional sprays of Penncap-M (all at 0.5 lb [AI]/acre) were sprayed on 4, 11, and 18 Aug, respectively. On 25 Aug the remaining 50 ears in each treatment were evaluated for ear injury.
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