Abstract
The ULV spraying method was used in combination with charging elecirostatic spray particles in malathion application for controlling Anthonomuls grandis Boheman. Bioassay methods were used in evaluation of application method and rates when applied on cotton with both caged weevils and live weevils attached to small picks (weevilpicks) mounted on cotton plants. By using electrically charged particles and auxiliary air, incorporated with ULV sprayer system, about 90% control of boll weevil was achieved with 1.25 lb of malathion per acre. Almost equal effectiveness of control was achieved at one-half of the rate applied with the system. Removal of the electrostatic charging component of the system reduced weevil mortality by 5 to 10%. However, removal of the auxiliary air-propelled spray component of the system reduced its effectiveness by about 20%. This reduction was attributed to the increased penetration of the insecticide into the plant canopy by the use of the auxiliary air.
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