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Abstract
Ecological studies and the effects of microbial pesticides on some legume insect pests and their natural enemies” In Egypt, cowpea and common bean are considered the most important leguminous vegetable crops. Therefore, strong efforts have been conducted for increasing crops. Therefore, strong efforts have been conducted for increasing crops yield to meet with the increasing demand for both local consumption and export. On the other hand, cowpea and common bean are attacked by many insect species causing several damage. The objective of the present work was initiated to investigate the ecology of eight insect pests infesting cowpea plants and two insect pests infesting common bean plants. Also, nine predatory insect species representing eight genera, belonging to seven families and following four orders, and five species of parasitoids representing five genera belonging to four families and following order Hymenoptera were captures in the sweeping taken from cowpea and common bean fields or collected with vegetative samples. In addition to evaluated 15 compounds (2 Organophosphorus, 5 Fungus, 3 Bacterial, 1 Virus, 2 Naturally Derived and 2 Mixtures) in Suppressing population densities of aphids and whitefly on common bean plants and its predators was estimated after two spray of each compound in the open field.