Abstract
When tested as space sprays on the Campbell turntable against house flies (Musca domestica L.), the m -isopropoxybenzyl, m -allyloxybenzyl, m -ethoxybenzyl, o -allyloxybenzyl, and m -propoxybenzyl esters of dl-cis-trans -chrysanthemumic acids were, respectively, about 22, 14, 9, 6 and 3% as toxic as allethrin, and about 68, 43, 29, 16, and 10% as toxic as pyrethrins at the 50% mortality level. Above this level the ratios were higher. The o -ethoxybenzyl ester was but slightly toxic and the p - allyloxybenzyl, p -propoxybenzyl, and p -ethoxybenzyl esters were practically nontoxic at 30 mg. per milliliter. The knockdown value of the esters was much inferior to that of allethrin or pyrethrins.
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