Effects of photoperiod on testis development of insecticide resistant and susceptible populatiions of the house fly, Musca domestica L. (Diptera: Muscidae)

Abstract

The present study was conducted to examine the influences of different photoperiod regimes on selected testis development parameters in relation to insecticide resistance and susceptible strains of the house fly, Musca domestica L. (Diptera: Muscidae), under laboratory conditions. The control stocks were bred under 12/12 hr L:D (hours light:dark) photoperiod condition, and experimental stocks were bred under 0/24 hr, 6/18 hr, 12/12 hr and 18/6 hr L:D photoperiod conditions. The effect of photoperiod was evaluated by measuring the length, width and volume of the testis of both the resistant and susceptible strain.