الفهرس 
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Abstract
Entomopathogenic nematodes (EPNs) are currently marketed world wideforbiological control of insect pests. The objectives of the present work were to investigate interactions between EPNs and earthworms, terrestrial isopods and predaceous mites. It was found that, EPNs i.e., Heterorhabditis bacteriophora (HP 88 strain), H. megidis (BRT strain), Steinernema carpocapsae (All strain) and S. glaseri (NC strain) were not pathogenic to theearthwormAllolobophora sp. when they were applied at 5000 and 10000 infective juveniles (IJs)perPetri dish. On the other hand, the tested nematode species were able to kill16.67 to 40% of Porcellio scaber individuals when they were tested at 4000 IJs per box. Immature stages of P. scaber were more susceptible to the tested nematode species as compared to adult onces . As concentration increased from 4000 to 8000 IJs, mortality percentages were increased also. Dispersal of the tested EPNs was obviously increased in the presence of Allolobophora sp. and P. scaber. Four mesostigmatid mite species, one cryptostigmatid mite and one astigmatid mite were observed feeding on IJs of S.carpocapsae. Maximum predation was found with Machrocheles sp. followed descendingly by Tyrophagus sp. and Scheloribates sp., while Hypoaspis sp. proved to be the least effective one in this respect. However, Lasioseius sp. and Rhodacarus sp. were detected with moderate nematophagous action . On the other hand, one adult female of Macrocheles sp. was voracious feeder on four species of EPNs with insignificant variations consuming 18.0, 18.34, 17.66 and 17.34 individuals of H.bacteriophora, H. megidis, S. carpocapsae and S. glaseri within 24hrs, respectively. The predator consumed more IJs of the four EPNs in clay soil as compared to those consumed in sandy soil, while mixture of clay : sandy, 1:1 v/v gave moderate values.