Effects of Artemisia extract on the fourth instar of Schistocerca gregaria (Forskal) (Orthoptera: Acrididae [electronic resource].

Includes references.

Different parameters of Artemiaia monosperma petroleum ether extract were studied on treated desert locust Schistocerca gregaria (Forskal) (Orthoptera: Acrididae) 4th nymphal instar. The studied parameters when the topical application was applied were: percentages of nymphal mortality, inhibition of the next nymphal instar and adult formation, and the effects on the reproductive system of the survived males and females. The tested concentrations were 50, 100,500, 1000 and 5000 ppm. by using ethyl alcohol as a solvent. The nymphal mortality percentages were zero for 50 ppm and the control, while they ranged from 13.33 to 26.66 % for the higher concentrations. The inhibition of nymphs and adult formation was concentration dependent. Drastic malformation was observed in the treated nymphs and adults resulted from the treated nymphs either externally or in the reproductive system of the survived males and females. Also, food consumption, food deterrent effects and chitin deposition of body wall were estimated by using no choice feeding method. The results of the chitin deposition of the body wall indicated that the treated nymphs were less than the check. Studies of some nutritional indices showed that food consumption and growth rate decreased with the increase of the tested concentrations, By calculating the feeding deterrent effect of the Artimisia extract, it was proved to be moderate deterrent for the desert locust.

Summary in Arabic.

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