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Abstract
Locust and grasshoppers have long been characterized as omnivorous creatures which devoured all green vegetation. The great mobility of the locusts takes them beyond the desert into agricultural areas where they can cause rapid and divesting crop losses in the invasion area which extends over about 28 million Km2. Among the species of grasshoppers known in Egypt only two species of grasshoppers cause a serious damage to cultivated crops especially in the new reclaimed lands. These are Euprepocnemis plorans (Charp.) and Heteracris annulosa (Walker) (Orthoptera : Acrididae). Nakhla (1957). Recently E. plorans caused serious damage to maize cultivation in Sharkia and Dakahlia governorates.
The present control methods of locust and grasshoppers in Egypt are aimed to reduce sufficient numbers of locust and grasshoppers individuals by using chemical insecticides, so that the total amount lost in crops is reduced to acceptable level. Microbial control agents can be effective in controlling locust and grasshoppers for many reasons such as effects on the activity, reproduction, development, and behaviour.
The present study aimed to:
• Evaluate the susceptibility of S. gregaria and E. plorans to the entomopathogens: Metarhizium anisopliae var. acridum, Beauveria bassiana and Nosema locustae, and to study the effect of sub lethal doses of these entomopathogens on the development and fecundity of desert locust S. gregaria and grasshopper E. plorans, which may be useful in IPM programs of locust and grasshoppers.
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