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Onion is an important indispensable item in every kitchen as condiment and vegetable, hence commands an extensive internal market. The green leaves and immature and mature bulbs are eaten raw or used in preparation of vegetables. Among the various pests and diseases associated with onion, the root knot nematode (Meloidogyne incognita) had proved itself as an important limiting factor for successful cultivation of this crop. Recently root-knot nematode was observed to cause serious losses to green onion crop grown mostly in the field located near the Jamuna & Ganga river belt of Allahabad and the surrounding area in U.P. Differential host test was done to confirm the root knot disease in onion. The specific identity of the nematode was determined by cutting perineal pattern of the females and was confirmed as Meloidogyne incognita. [ABSTRACT FROM AUTHOR]