Corn Root Aphid-Nematode Control, 1980

Abstract

Abstract Experiments were conducted in Phelps County, NE, to evaluate 3 insecticides for reducing corn root aphids and/or nematode damage to corn. Plots were 2 rows (spaced 0.9 m), 10.7 m long arranged in a Latin Square design Experiment 1 was located in an area of the field that had severe stand reduction in 1979. Experiment 2 was in an area that did not have severe stand reduction in 1979. The granular insecticide/nematicides were applied after planting but before corn was emerged with a Noble metering device mounted on a manually operated planter press wheel to give an 18-cm band over the planted furrow. Pretreatment and posttreatment nematode soil samples were taken with a 2.5 × 20-cm soil probe. Corn root aphids are transported from plant to plant by ants (Lasius neoniger Emery). To prevent disrupting the experiment by digging plants and counting aphids, insect control was based on number of active anthills/row. Yields were determined by hand harvest.