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Pakistan Journal of Biological Sciences

Year: 2006 | Volume: 9 | Issue: 3 | Page No.: 530-533
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Authors

Mohammad Abahussain

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Research Article

Effect of the Non-steroidal Ecdysone Agonist, RH-5849, as a Control Agent Against the False Stable Fly, Muscina stabulans (Falle’n)

Mohammad Abahussain
The non-steroidal ecdysone agonist, RH-5849, was assessed as IGR against the false stable fly Muscina stabulans (Falle’n). A dose range of 0.025, 0.100, 0.400, 1.000 and 4.000 μg/insect was topically applied on 1 day old 3rd larval instar and the newly moulted pupae. The larval mortality was increased by increasing RH-5849 doses. While the pupal and adult mortalities which resulted from treated larvae were increased by decreasing doses. On the other hands, the higher of pupal deformation (40.3%) was obtained due to effect the dose of 1.000 μg/larva. Although some various deformities of the adult stage, there is no certain trend could be encountered for the adult deformities. No perfect adults could be emerging as affected by RH-5849 at the dose levels of 4.000 and 1.000 μg/larva. In case of treated pupae with RH-549 the percentage of pupal mortalities were increased by increasing the dose levels. Such relation could not determine completely for the adult mortalities or even the adult deformities. It is noteworthy to mention that, sex ratio of adults was encountered as two fold males than females after treating the newly moulted pupae with 1.000 μg /pupa. Some other data of sex ratio indicated the male predominance after treating the larvae with 0.025 or 0.100 μg/larva. RH-5849 was severely suppressed the reproductive performance of M. stabulans, particularly at the two higher doses of 1.000 and 4.000 g/larva or /pupa. Also the resulted deformed females were not lay eggs.
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