Abstract
Abstract Tests were conducted at 3 locations to determine efficacy of insecticides applied with ground sprayers for control of alfalfa weevil larvae using a randomized-complete block design with 3-4 replications. Treatments for Test 1 (Grady County) were applied on 31 Mar with a spray volume of 20 gal/acre. Efficacy of insecticides against blue alfalfa aphid and the alfalfa weevil was evaluated. Test 2 was located in Stephens County where treatments were applied on 28 Mar with a volume of 14 gal/acre. Treatment date and volume for Test 3 (Tillman County) were 15 Mar and 9 gal/acre, respectively. Pretreatment population levels for the weevil exceeded the economic threshold of about 1.5 larvae/stem in all tests. Efficacy of insecticides was determined from counts made by extraction of weevil larvae and blue aphids with Berlese funnels (Test 1) from stem samples taken at several intervals after spraying. Dry matter yields were estimated in Test 1 by harvesting forage from a 1 × 5 m area from each plot and drying a subsample to determine moisture content.
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