Compatibility of entomopathogenic nematode, Steinernema carpocapsae All with four recommended insecticides; fipronil, flonicamid, indoxacarb and spinetoram was studied. The entomopathogenic nematode was mixed with all tested insecticides (half of recommended field rate used) and investigated with the wax moth larvae (Galleria mellonella) under laboratory condition. The obtained results cleared that the entomopathogenic nematode, S. carpocapsae All was compatible with all tested insecticides. Ten treatments were used against Tuta absoluta under green house conditions; S. carpocapsae all (250 IJs/ml) all alone, recommended field rate of each insecticide alone, S. carpocapsae (250 IJs/ml) All combined with half of recommended field rate of each insecticide and water only as a control. The obtained results showed that spinetoram alone was the most toxic insecticides against T. absoluta followed by indoxacarb alone with the percent of mine reduction 99.3 and 80%, respectively, after the third treatment. S. carpocapsae All alone was the least toxic with the percent of mine reduction 12.9%. This result confirmed that S. carpocapsae All was not effected against T. absoluta.
