Corn Rootworm Control, 1992

Abstract

Abstract Granular and liquid insecticides were applied at planting time (P) and post plant at Concord, NE. 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 16 m long row; rows were 75 cm apart. Granular materials were applied infurrow or in an 18 cm band with a John Deere 2 row planter equipped with a cone-belt insecticide distributor and incorporation tines. Cultivation treatments (C) were applied over the row on 12 Jun with a cone-belt distributor mounted on a hand powered bicycle wheel applicator. Cultivation application was followed immediately by a tractor mounted cultivator after all treatments were applied. Furadan 4 F was applied over the row at 2 different rates and 2 different times (21 May, E, and 3 Jun, L) in a 37 cm band, with a CO2 backpack sprayer at 25 psi, approximately 142 liters/ha total volume. No phytotoxicity was observed. Stand counts were not significantly different. Feeding damage was evaluated 20 and 21 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 toots completely destroyed).