The Evaluation of Insecticides for the Control of Tendipes Plumosus (Linnaeus)1

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Abstract
In laboratory tests, 16 commercially available oregano phosphate Insecticides were screened to determine their relative toxicity to larvae of Tendipes plumosus (Linnaeus) and to the fathead minnow, Pimephales promelas Rafinesque. DDVP, Dipterex, EPN, Guthion, malathion, and Phosdrin all showed considerable toxicity to the larvae at concentrations of 0.1 pounds or lees per acre of the technical material incorporated into granules, Of these six insecticides, DDVP at 50 pounds per acre, Dipterex at 100 pounds per acre, and malathion at 20 pounds per acre showed no toxicity to the minnows in replicated tests. These same three insecticides, in replicated tests, all produced 97% mortality of T. plumosus larvae within 7 days at concentrations of 0.75 pounds per acre and Dipterex produced 97% mortality at 0.05 pounds per acre.

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