Abstract
In the laboratory, 7 organophosphorus insecticides were tested against 4th instars (field populations) of Chironomus spp., Tanytarsus spp., and Cricotopus spp. midges. Chlorpyrifos, followed by temephos, was the most active compound against Chironomus spp. and Tanytarsus spp. Cricotopus spp. were most susceptible to phenthoate. For larval control in the field, granules of temephos enclosed in burlap sacs, were applied at various sites in a flood control channel and an emulsifiable formulation of temephos was dripped for a period of 24 h at the head basin of a series of 3 basins. The treatment rate for both the formulations was 0.15 lb AI/surface acre. The granular formulation controlled Chironomus spp. for 3–6 weeks, and Tanytarsus spp. for 3–8 weeks. The emulsifiable concentrate yielded satisfactory control of Chironomus spp. and Tanytarsus spp. in the lead basin only. Procladius spp. were not significantly suppressed either in the channel or in the spreading basins.
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