The non-target safety of two neem-based insecticides, Neemroc EC[registered trademark] (an oil formulation) and Neemros[registered trademark] (an oil-free powder formulation) to adults of Diadegma mollipla (Holmgren), a larval parasitoid of the diamondback moth, Plutella xylostella (L.), was investigated in laboratory bioassays. The neem insecticides were compared against Karate[registered trademark] (a synthetic pyrethroid insecticide) and water as sprays. Karate[registered trademark] caused 100% mortality in treated wasps within 6 h, while the two neem insecticides did not cause any significant mortality. The mean longevity of wasps was not significantly affected by exposure to the two neem insecticides. The time allocation to different components of foraging behaviour by adult females was not significantly altered by the neem treatments. The mean proportion of second instar P. xylostella larvae parasitised by water-sprayed wasps was not significantly different from that of the neem insecticide-sprayed wasps. It is concluded that the field dose rate of the neem insecticides recommended for P. xylostella control did not cause any apparent adverse effects on the survival and foraging behaviour of D. mollipla. Evidently, the neem insecticides are compatible with the activity of D. mollipla and could, therefore, constitute complementary components in the integrated management of P. xylostella on cabbage. none