EVALUATION OF SELECTED DOSES OF THREE FORMULATIONS OFAERIALLY APPLIEDMALATHION FOR BOLL WEEVIL, ANTHONOMUS GRANDIS BOHEMAN

摘要

Two recently prepared formulations (Fyfanon ULV and Cheminova CS) and a one year old formulation (3M MEC) ofmalathion, were each aerially applied at three different doses to cotton fields near Tucumcari, New Mexico for evaluationagainst boll weevil. An extensive bioassay utilizing field collected cotton leaves and laboratory reared boll weevils was usedto compare the individual activity levels among the different treatments. Mortalities resulting from weevils exposed to treatedand untreated leaves were also compared. Mortality data resulting from all treatments for residual ages of 0, 2, 3, 4, 6, 8, 10,12 and 14 days are shown.Two doses of the standard Fyfanon ULV formulation demonstrated significant activity for 6 days after treatment. Thetraditional 0.93 lb AI/acre dose produced 100% mortality compared to 15% mortality in untreated populations on day 0. At 8days after treatment, the 0.93 lb AI/acre dose produced 11% mortality compared to 9% in the untreated populations whichwas not statistically different in this study.