Abstract
When 1,1, bis (p-chlorophenyl) chloromethane (DBC), 1,1, bis (p-chlorophenyl ethanol (DMC) and 1,1,bis (p-chlorophenyl ethnyl carbinol (EC), which synergize the contact effect of DDT on adult house flies (Musca domestica L.), Were added in amounts of from 1.3 to 130 parts per million to the milk used to moisten a 'cellu-cotton' substratum in which house fly larvae were reared there was some mortality of early instar larvae, but those that survived grew with normal rapidity, reached normal weight, and gave rise to normal pupae and adults except that surviving third instar larvae were more susceptible to contact with DDT than those from untreated media. Pupae and adults showed no greater susceptibility. Pupation was slowed down but fecundity was unaffected. The eggs laid were of normal viability and adult longevity was normal.
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