Vol. 11, Issue 7 (2022)

Author(s):
Reecha J, S Thiruvudainambi, P Mareeswari, R Oviya and S Vellaikumar

Abstract:
Onion twister blight disease is a major rainy season disease in major onion cultivating areas of Madurai and Virudhunagar districts. The disease showed characteristic symptoms of twisting, curling, chlorosis of leaves, conidial mass in the neck region, and slender bulbs. The pathogen was isolated and its morphological characteristics were studied. It showed greyish white to grey mycelium which was hyaline and spectate. The pathogen produced conidia which was hyaline, cylindrical in shape, and spore size ranged between 15-20x4-6µm. The artificial inoculation test proves its pathogenicity which satisfied Koch’s postulates and the morphological characteristics of various isolates of C. Gloeosporioides were confirmed.