Abstract
Abstract Infested bluegrass seed fields were selected to study insecticides for the control of Chionodespsiloptera (Gelechiidae) larvae. This is a locally very important root and crown feeding insect similar in habit and damage to sod webworms. Treatments were applied on 1/100th acre treatment areas in randomized blocks, the number of replications governed by the size of the infested area (Field 1 - 4 repl, Field 2 and 3-2 repl). A hand sprayer was used to apply sprays at 25 psi and 50 gal/acre. Granules were applied with a cyclone type hand spreader. Soil was Green Bluff silt loam in fields 1 and 2 and Garrison gravely loam in field 3. Field 1 and 2 were nonirrigated and field 3 was under irrigation. Post-treatment samples were not collected in fields 1 and 2 until fall rainfall occurred. Insects were sampled by removing 6 soil cores, 4 in. diam and depth from a 5 sq ft central representative area for both pre- and posttreatment sampling. Pesticides were applied after burning of grass stubble. Treatment dates were: Field 1 = Sep 29'75, Field 7 = Sep 24'75 and Field 3 = Sep 16'75.
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