Studies on Colletotrichum species causing anthracnose in pomegranate
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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 Colletotrichum species causing anthracnose in pomegranate” was undertaken to study the cultural and epidemiological aspects of the pathogen and management of the disease. Anthracnose disease of pomegranate was isolated, purified and identified as Colletotrichum acutatum. Pathogenicity was proved by incision and spore suspension method by inoculating the isolated pathogen into mature healthy fruits of pomegranate on which the symptoms appeared in 96.00 and 144.00 h, respectively. Out of six nutrient media tested, potato dextrose agar (PDA) was found to the best medium for growth of C. Acutatum. Temperature of 300 C and PH 6.0 was found to be optimum for the growth of pathogen. A temperature ranging from 25-350 C and relative humidity more than 80.5 percent was found to be optimum for sysmptom development under artificial inoculation conditions. Out of the plant extracts evaluated maximum inhibition was recorded with use of Ocimum sp. (59.01%) while, tricyclazole 75% WP, metiram 70% WG, mancozeb 75% WP, myclobutanil 10% WP and azoxystrobin 18.2% + difenoconazole 11.4% SC resulted in cent per cent inhibition of the pathogen under in vitro conditions. Mancozeb 75% WP was found to be most effective fungicide both in pre-as well as post inoculation spray treatments resulting, in mean maximum incubations period (216.00h0 and mean minimum lesion diameter (24.92mm). Among all the three varieties screened viz., Chawla, Sindhuri and kandhari none were found to be resistant towards the disease.