SAMIA A. G. METWALLY
Plant Protection Research Institute, Agric. Res. Center , Dokki, Cairo , Egypt

ABSTRACT

Liriomyza trfolii (Burg.). is considered one of the main pests of cowpea in Egypt . The population dynamics of the pest and parasitoids species associated with it were studied for two growing seasons, 1989 and 1990. Highest pupal population (1284) of L. trifolii was observed by the end of September, while the lowest (210) was observed by mid-August. Four hymenopterous parasitoids, Ilallicoptera circulus Walker , Anagriss sp., Chrysonotomyia sp. and Hemiplarsenus zilahzsebessi Er- dos were recorded, for the first time in Egypt , associated with the pest in cowpea. Highest rates of parasitism (33.09%) were estimated by mid-October, while the lowest rate reached (8.0%) by mid-July. Obtained data showed that Anagrus sp. and Chrysonotomyia sp. recorded the relatively highest rates of parasitism (6.3 and 5.2%, respectively), while H. zilahisbessi recorded the lowest (0.81%). Data also indicated that the most active period of the parasitoids, Anagrus sp., 11. circulus and Chrysonotomyia sp. took place during October and in case of H. zitahisebessi, it was during August

Key Words: Liriotnyza trifolii, Population, Parasitoids Cowpea, Egypt .