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Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only Publication Acceptance Date: 5/20/1998 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Three oil diluents were evaluated in application tests against the boll weevil in the laboratory and field at the USDA-ARS Research Laboratory at Stoneville, MS during 1997. The diluents used in these tests were: once-refined cottonseed oil, and two horticultural oils, Orchex 796 and WS2908B. A series of aerial application tests of cyfluthrin and ULV malathion, which compared rates and types of oil diluents, were conducted during August and September 1997. The first of these tests determined the effects of oil diluents on efficacy of ULV malathion. Ten ounces of ULV malathion per acre were applied in a total volume of 37 oz/A of diluent. A 10 oz/A application of undiluted ULV malathion was used as a standard. There were no differences in mortality between treatments throughout the 3 days of the test period. At 3 DAT, the undiluted 10 oz/A application of ULV malathion was just as effective as 10 oz/A of ULV malathion mixed in a total volume of 37 oz/A of WS2908B or Orchex 796 or cottonseed oil. Tests of cyfluthrin (0.02 lb/A) mixed in the three different oils were conducted in the same manner as that of the ULV malathion tests. Cyfluthrin mixed in cottonseed oil produced greater mortality at 2 DAT than WS2908B and Orchex 796. Cyfluthrin mixed in WS2908B had mortalities equivalent to the cottonseed oil treatment in all bioassays except at 2 DAT. Cyfluthrin mixed in Orchex 769 had the lowest mortality at 0 (78%) and 2 (61%) DAT. Evaluations of oil diluents in field tests did not reveal enhanced toxicity of ULV malathion or cyfluthrin. |
