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The onion (Allium cepa) also known as the bulb onion or common onion, is used as a vegetable. Purple blotch of onion is one of the severe diseases of onion. It causes higher yield losses ranges between 5.0 96.5 per cent (Gupta et al., 1994) as compared to other onion diseases. It causes losses of 25 % during rabi and 50 % during kharif seasons in Maharashtra. Anonymous (2013) reported that eye shaped, purple colored spots developed on leaves which are surrounded by a broad chlorotic margin and are also prominent on the flower stalk. It is speculated that the purple blotch is managed by following clean cultivation, good drainage and use of drip irrigation and seed treatment with thiram @ 3g / kg seed and foliar sprays of mancozeb @ 0.2 %, tricyclazole @ 0.1 % and hexaconazole @ 0.1 %.

Oligochitosan as an Effective Modulator to Manage the Yield and Productivity of Onion Infected by Alternaria porri