An Emulsifiable Concentrate for Pyrethrum and Similar Insecticides1

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Abstract
Pyrethrum emulsions have been used to make mass collections of fly larvae (Tabanidae) using the New Jersey mosquito larvicide. A fine emulsion of pyrethrum was produced by the addition of several chlorinated polyphenyls, Aroclor 1221, 1232, 1242, and 1248 to the pyrethrum-kerosene-emulsifier (CTX-54). Two formulations were made for field studies of tabanid larvae: (1) pyrethrins 1%, piperonyl butoxide 10%, CTX-54 11%, Aroclor 1248 33% in deodorized kerosene (all percentages by weight); and (2) the same formulation without piperonyl butoxide. Initial dispersion was spontaneous and stability was excellent, in excess of 14 days. Formulations of allethrin and cyclethrin were made in the same manner and were satisfactory. The addition of various candidate synergists, antioxidants, and/or extenders into the different formulations posed no special formulation problem.

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