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However, as many as two treatments may be needed with a severe insect outbreak.
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Most years will not require the use of insecticides. Refer to the tables for the percent defoliation to determine if control measures are justified. This method should give a fairly accurate measure of the percent defoliation. Pull up plants from several locations in the field and place the leaves against a light background. ( Note "Time of Treatment" in Control Tables at the end of this publication.)ĭetermining the percent of defoliation by observing the bean field may be difficult because the dense foliage hides damaged leaves. Use the average number of insects found for determining when to spray. If you have no available cloth, use the soil surface as the area for counting insects. Count the insects and repeat this process at 10 different locations in the field. Place the cloth between two rows, vigorously shake approximately two row feet of plants in each row over the cloth. A cloth or a newspaper 42" x 24" may be used in the row middle to facilitate counting the soybean insects in almost any row width. Shaking soybeans over the row middle will generally be adequate in determining the soybean insects present. To establish need and estimate proper timing for soybean insect control, fields need to be inspected at least once a week from first planting until maturity. Evaluation of Soybean Insect Infestations The following information and control aids should enable the grower to minimize losses due to insect pests on soybeans.
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More insect problems have been associated with Kentucky soybeans since it has become a major crop. Kentucky now ranks among the major soybean producing states.
INSECTICIDES AND PESTICIDES PDF
ENT-13: Insecticide Recommendations for Soybeans - 2016 | Download PDF Prepared by Douglas Johnson, Extension Entomologist