Abstract
Abstract Seven insecticides were applied at the fully labeled rate and a reduced rate at planting and first cultivation times at Concord, Nebr. The test plot was planted 8 May in a continuous corn field with a silty clay loam type. The experimental design was a randomized complete block with 4 replicates. Each treatment consisted of a single 50 m long row; rows were 11.8 cm apart. Infurrow granular treatments were applied by a John Deere Tractor mounted unit at planting. Granular formulations were applied in a 2.75 cm band by a Noble granular metering unit mounted on a hand-powered bicycle applicator equipped with incorporation tines on 11 May. Furadan 4 F was applied over the row in a 2.75 cm band and basally, both at cultivation time with a C02 backpack sprayer at 25 psi, approximately 142 liters/hectare total volume. Cultivation treatments were applied 12 Jun over the row followed immediately by a tractor-mounted cultivator. No phytotoxicity was observed. Stand counts were not significantly different. Feeding damage was evaluated 23 and 23 Jul. Five roots were dug from each treatment row and rated by the Iowa 1-6 scale (1, no damage; 6, 3 or more nodes of roots completely destroyed). Rainfall was near normal for the period from 8 May to 24 Jul, with no rainfall event more than 2 inches in any 24 h period. Subsoil moisture rated short at time of planting.
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