Abstract
Relative potencies of diflubenzuron, penfluron, and Bay Sir 8514 (2-chloro-N-[[[4-(trifluoromethoxy) phenyl]amino]carbonyl]benzamide) were evaluated as female sterilants against Musca domestica L. by injection. Penfluron and Bay Sir 8514 were more than twice as potent sterilants as diflubenzuron. Penfluron was as potent or more potent than Bay Sir 8514. Moreover, female house flies injected with penfluron or Bay Sir 8514 remained sterile for more than 3 wk, but those injected with diflubenzuron regained fertility partially or completely 10 days post treatment. All 3 compounds prevented egg hatch whether the flies received the injection while they were virgins, after they were inseminated, or after they had laid their 1st batch of eggs.

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