Studies on Alternaria fruit spot disease of pomegranate caused by ALternaria Sp.
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Date
2022-10-31
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College of Horticulture and Forestry, Dr YSP UHF, Neri, Hamirpur (H.P.)
Abstract
The present investigation entitled “Studies on Alternaria fruit spot disease of pomegranate caused by ALternaria Sp.’’ was undertaken to record cultural, epidemiological aspects of the pathogen and management of the disease. The pathogen was isolated, purified and identified as Alternaria alternate under ITCC No. 11703.22. Pathogenicity of the isolated pathogen was proved by two methods, in spore suspension method the symptoms appeared in 168 h while, in incision method, symptoms appeared in 72 h. Out of six nutrient media tested, potato dextrose agar was found to the best medium for growth of A. Alternate. Temperature of 250 c and PH 6.5 was found to be optimum for the growth of pathogen. A temperature ranging from 30-350 c and relative humidity more than 89.9 per cent was found to be optimum for symptom development under artificial inoculation conditions. Azoxystrobin + difenoconazole, myclobutanil and tricyclazole resulted in cent per cent inhibition of the pathogen while, Azadirachta sp. Leaf extract inhibited the pathogen up to 51.11 per cent under in vitro conditions. Myclobutanil was found to be most effective fungicide both in pre as well as post inoculation spray treatments resulting, in maximum incubation period (240.67 and 154.00 h, respectively) and minimum disease severity (9.00 and 10,00%, respectively).