Insect Control 74

Insect Control-74
Project Leader and Principal UC Investigators A.A. Grigarick M.O. Way S.L. Clement S. Scott	Chemical control of the rice water weevil. A search for more effective and safer insecticides is being routinely made to refine and update current control recommendations. Three experimental carbamates were quite effective in 1974 in the greenhouse and the field at 1.0 lb. active ingredient per acre. BaygonŽ, DasanitŽ, and GA-4-653 provided unsatisfactory control. Chemical control of seed midges. No chemical is presently registered for seed midge control in rice. Injury by midges in commercial fields has been very erratic and unpredictable, and the evaluation of chemicals for their control will be very difficult because of the unpredictability of infestations. Experimental spray applications of DursbanŽ, parathion, and SevinŽ were made to fields flooded 3 and 4 weeks at Biggs and Davis. Preflood applications of DasanitŽ, BuxŽ, and FuradanŽ at Biggs were also examined for midge control. Variation within the plots was such that no significance in control could be determined, but some midges were present in all treatments. A SevinŽ treatment showed the lowest number of midges. Seed treatments utilizing the chemicals DursbanŽ, MesurolŽ, Zinc CoposilŽ, LargonŽ, and copper were examined with an untreated check for midge control, but an infestation of larvae failed to develop in these tests.

Insect Control-74

Project Leader and Principal UC Investigators

A.A. Grigarick

M.O. Way

S.L. Clement

S. Scott

Chemical control of the rice water weevil. A search for more effective and safer insecticides is being routinely made to refine and update current control recommendations. Three experimental carbamates were quite effective in 1974 in the greenhouse and the field at 1.0 lb. active ingredient per acre. BaygonŽ, DasanitŽ, and GA-4-653 provided unsatisfactory control.

Chemical control of seed midges. No chemical is presently registered for seed midge control in rice. Injury by midges in commercial fields has been very erratic and unpredictable, and the evaluation of chemicals for their control will be very difficult because of the unpredictability of infestations.

Experimental spray applications of DursbanŽ, parathion, and SevinŽ were made to fields flooded 3 and 4 weeks at Biggs and Davis. Preflood applications of DasanitŽ, BuxŽ, and FuradanŽ at Biggs were also examined for midge control. Variation within the plots was such that no significance in control could be determined, but some midges were present in all treatments. A SevinŽ treatment showed the lowest number of midges.

Seed treatments utilizing the chemicals DursbanŽ, MesurolŽ, Zinc CoposilŽ, LargonŽ, and copper were examined with an untreated check for midge control, but an infestation of larvae failed to develop in these tests.