Abstract
Abstract Stoneville 213 variety cotton was planted April 23 on Vicksburg fine sandy loam at the West Tenn. Expt. Sta., Jackson,TN. Four-row plots, 35 ft long, were replicated 5 times in a randomized complete block design. The entire plot area was sprayed Aug 1 with methyl parathion (1.0 lb ai/acre) to remove beneficials and encourage a bollworm outbreak. The number of bollworm eggs counted in terminals exceeded the recommended threshold level on Aug 11. Insecticides were applied Aug 11 with a 4-row boom at the rate of 9.4 gal of mixture per acre (3 mph, 40 psi, 3 Delavan HB 4 70° nozzles per row) with a CO2-pressurized system mounted on an IH 660 high clearance sprayer. Because of drought conditions, plants were not attractive for bollworm moth oviposition and further applications were not required. The two center rows of each plot were machine harvested Sep 19 and Oct 7. Yield data were subjected to analysis of variance.
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