Abstract
A total of 15 counties in New York is presently known to be infested by the alfalfa weevil, Hypera postica (Gyll.)(Curculionidae: Coleoptera). Larval feeding in 1958 was delayed on the first alfalfa cutting and resulted in injury to the second crop. Five replicated experiments were conducted in second-cutting fields in Dutchess, Orange, and Ulster Counties in which 15 insecticides were applied as low pressure, low volume sprays. Heptachlor at 4 ounces actual material per acre gave excellent control of larvae for 32 days following application. Chlordane at 32 ounces and lindane and endrin each at 4 ounces per acre gave good larva] control for 2 weeks after treatment, while phosphorus- containing compounds gave effective larval control for slightly more than 1 week. Heptachlor applied at a rate of 8 ounces per acre gave good control of the alfalfa weevil adult for 2 weeks following application.
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