The diamondback moth Plutella xylostella Linnaeus, 1758 (Lepidoptera: Plutellidae) is improperly and excessively controlled with synthetic insecticides in vegetable crops. Neem (Azadirachta indica A. Juss) is reported to be an alternative natural insecticide in the control of many insect pests including P. xylostella. The aims of this study are...