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Priyanka Jhala, Mahendra Kumar Meena* and B.L. Mali
Department of Plant Pathology, Rajasthan College of Agriculture, MPUAT, Udaipur-313001
Email: mahendrameena781@gmail.com
Received-16.03.2017, Revised-07.05.2017
Abstract: An experiment was conducted on” Impact of abiotic factors and age of host plant on purple blotch of onion (Allium cepa L.) caused by Alternaria porri (Ellis) and estimation of yield losses “was carried out in Department of Plant Pathology, cage house and experimental field of Horticulture farm, Rajasthan College of Agriculture, Udaipur during 2014-2015. Sixty-days-old plants were more susceptible for infection of A. porri. However, susceptibility increased with increased age and after 60-days age decreased in susceptibility was recorded. In field trial conducted for yield loss estimation revealed that maximum yield loss (50.11%) was obtained in control plots followed by one, two and three spray of Mancozeb @ 0.2 per cent concentration. In relation to environmental factors study, temperature ranged from 13 to 32°C, relative humidity more than 75 per cent, wind velocity 2.4 Kmph, sunshine 8.4 hrs and optimum rainfall was found favourable for purple blotch disease development.
Keywords: Purple blotch, Onion, Abiotic, Age of host, Yield loss
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