Abstract
Abstract Granular insecticides were applied to suppress larval rootworm populations in 2 fields in west central NE. Insecticides were applied at planting to ridge-planted ‘Pioneer 3467’ hybrid field corn in Field 1 on 18 May. Application was made to a non-tilled seed bed with insecticide boxes on a John Deere Max-emerge ridge till planter. Four replications of each treatment were arranged in a RCBD. T-band applications were made by applying a 7 inch band of insecticide in front of the press wheel. Banded applications were made by applying a 7 inch band of insecticide behind the press wheel and incorporated with a chain. In-furrow applications were made by applying insecticide directly into the seed furrow. Insecticides were applied over the whorl of blocks of ‘Keltgen 1150’ and ‘Producers 870’ hybrid field corn plants in Field 2 at cultivation on 15 Jun. The application was made with International Harvester boxes on a KMC ditcher/cultivator unit. Each treatment in Field 2 was replicated twice and arranged in a RCBD. Corn plant hybrid was used as the blocking criteria. All insecticides in both fields were applied at a rate of 1114.5 g (AI)/ha. Treatments in both fields were evaluated 13 Jul by rating washed roots, using the 1-6 Iowa Root Damage Rating Scale, of 4 plants from each replicate.
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