YIELD RESPONSE OF SOYBEANS TO RECOMMENDED INSECT MANAGEMENT PRACTICES IN ALABAMA
Applied Research
Timothy Reed
EXTENSION SPECIALIST
ALABAMA COOPERATIVE EXTENSION SYSTEM
Belle Mina
Abstract
\r\n Numerous Insect pests can often reduce soybean yields in Alabama and more information is needed on the yield response of soybeans to insecticide seed treatments and foliar insecticide applications to control individual insect pests and insect pest complexes. Studies were conducted in Alabama from 2008-2010 to determine the yield response of soybeans to insecticide seed treatments and foliar applications of insecticides to control individual pests and insect pest complexes. General seed treatments evaluated were (1) Insecticide (2) Fungicide + Insecticide (3) Fungicide + Early Season Insecticide Foliar Overspray and (4) Untreated. Additional tests were conducted to evaluate efficacy of several insecticides in controlling and preventing yield losses to soybean loopers infesting R3 beans; a complex of Brown and Green stink bugs infesting R7 beans ; a complex of 3-Cornered Alfalfa Hoppers (3CAH's) and Grasshoppers infesting R5 beans and a complex of Bean Leaf beetles and Katydids infesting late R2 beans. Sixteen insecticide seed treatment tests were conducted and in two tests the Insecticide + Fungicide seed treatment yielded significantly more soybeans than the untreated beans. In one seed treatment study the Fungicide + Early Season Pyrethroid Overspray treatment yielded significantly more than the untreated check. Neither the complex of Bean Leaf beetles and Katydids or the complex of Brown and Green stink bugs significantly reduced yields. Soybean loopers and the complex of 3CAH's plus grasshoppers did significantly reduce yields.
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Authors: T. D. Reed
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Reed, T. Extension Entomologist, Alabama Cooperative Extension System, Alabama, 35615