Diflubenzuron-treated carpet inhibited egg-to-adult development of the cat flea for up to 12 mo even with weekly vacuuming of the carpet. The efficacy of diflubenzuron was similar in treated soils over a 6-mo test period except in the case of treated soil that remained outside. Reduced efficacy is attributed to degradation of diflubenzuron by microorganisms and water.
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Henderson et al. (1993) studied this question.