Effectiveness of nonsteroidal ecdysone mimic tebufenozide on development, reproduction and progeny of the house fly Musca domestica (Diptera: Muscidae)
1999
Bream, A.S. | Ghoneim, K.S. (Al-Azhar Univ., Cairo (Egypt). Faculty of Agriculture) | Mohamed, H.A.
The present study was undertaken to investigate the effects of the nonsteroidal ecdysone mimic, tebufenozide (RH 5992) on different physiological criteria of the house fly Musca domestica. Five concentration levels of this compound (1000, 500, 250, 250, 125 and 62.5 ppm) were used with the artificial diet. The percentage of premature lethal moult increased by increasing concentration levels of RH 5992 against second instar larvae. Similar trend of the effect was not observed after treatment of third instar larvae. The pupation reduction was consecutively related to the concentration levels and the adult emergence was affected in a similar course. The larval maximum weights were considerably decreased at the higher four concentration levels against second instar larvae and only at the higher three concentration levels against third instar larvae. This ecdysteroid exerted an accelerating action on the development of larvae especially by feeding second instar larvae on tebufenozide-treated diet. Also, the pupal development was hastened, irrespective of the time of treatment. Fecundity of adult females was tremendously handicapped by the higher concentration levels because on eggs were deposited. The fecundity was reduced, but not significantly, by other concentration levels. In addition, a slight inhibitory effect of RH 5992 was observed on the fertility, regardless of the larval treatment. An experiment was conducted by feeding the adult females on tebufenozide-treated milky solution at concentration levels 5000, 2500, 1250, 625 and 312.5 ppm. Some adult deaths were observed in no certain course. Treatment with the lowest concentration, level slightly prolonged the adult longevity but other concentration levels shortened it. Against the offspring, this ecdysteroid compound exhibited only a weak effect on pupation rate, pupal duration, developmental rate and adult emergence.
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