Efficacy of purple blotch of onion incited by A. porri (Ellis)

Abstract

Onion (Allium cepa L.) is one of the oldest bulb crop belongs to family Amaryllidaceae. It contains a phytochemical called quercetin, which is effective in reducing the risk of cardiovascular diseases, an anticancer and has promise to be an antioxidant. It is one of the most important vegetable cum condiment crop grown throughout the world. A. porri destructs the leaf tissue which destroys the stimulus for bulb initiation and delays bulbing and maturation. Severe attack on flowering alliums can completely girdle flower stalks with necrotic tissue, causing their collapse and total loss of seed production capacity. Further, seed infection causes more severe economic loss in seed production. fungicides have been used in agriculture to protect crops against the losses caused by plant diseases and are recognized as an essential element in crop protection programmes for longlasting. The present experiment were used contact, systematic fungicides and their combinations at different concentrations under In-vitro conditions for inhibition towards A. porri to confirm for future sprayings to manage disease incidence of purple blotch of onion.