Effectiveness of Synergized Allethrin and Pyrethrum Sprays Against Mosquitoes1

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Abstract
In spray tests against Aedes aegypti and Anopheles quadrimaculatus, piperonyl butoxide, sulfoxide, propyl isome, and MGK-264 were compared as synergists for both allethrin and pyrethrins. Against Aedes piperonyl butoxide was the most effective when used with pyrethrins, but sulfoxide and propyl isome also gave good synergism. MGK-264 caused no synergism. With allethrin the degree of synergism was not as great as with pyrethrins. MGK-264 again caused no synergism, but the others were nearly equal. Against Anopheles when the synergists were used with pyrethrins the results were similar to those against Aedes. With allethrin, however, MGK-264 was equal to piperonyl butoxide and sulfoxide and propyl isome was slightly more effective. Three of the synergists were ineffective when tried alone, whereas MGK-264 showed slight toxicity.

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