Abstract: This research is about onion (Allium cepa L.) which is an important commonly grown vegetable in kitchen gardens and for commercial purposes throughout the globe its crucial. A field experiment was conducted at Entomology farm, Faculty of Agriculture RNTU, Raisen M.P. during rabi, 2021-22, toinvestigate the succession of onion insect pest complex in onion crop. Observation was taken immediately after transplanting. For observation a sample of 25 plants was randomly selected for observation of various pest complex as well as natural enemies. The first appearance of the thrips was observed when the crop age was about 18-22 days i.e. vegetative stage. It is evident that the pest was present on the crop during the vegetative stage and remained available up to the second week of January i.e. reproductive stage of the crop (25.29 days). Appearance of spider (39-43 days) & red spider (32-36 days) was observed when the crop age i.e. maturity Stage & Reproductive Stage (Flowering / Fruiting Stage).
