Screening of Rejuvenated Mango Cultivars Under Sub-Himalayan Terai Region of West Bengal against Anthracnose (Colletotrichum gloeosporioides)

Abstract

Aim: The severity of mango anthracnose disease on different mango varieties after the rejuvenation were studied for two consecutive years (2019-2020 and 2020-2021) under sub-Himalyan Terai region of West Bengal. Data Collection: Five uniform twigs of each variety having 8-10 leaves were marked for screening and observation was taken at monthly interval. Diseases severity of mango was measured at monthly interval after 120 days of rejuvenation with following standard procedure and disease scoring scale. Disease scoring scale for anthracnose (0-5 scale) on leaves were calculated every month. Methodology: Five mango cultivars viz., Amrapali, Mallika, Himsagar, Fazli and Langra were selected as treatments and age of the plants were 23 years, spacing is 8x8m and the trees were headed back at 150 cm height from the ground level and five treatments were randomized with four replications. Result: Maximum anthracnose severity was found in Mallika (62.69%) in the month of May, while minimum anthracnose severity was recorded in Himsagar (14.96%). Among the all five cultivars studied, maximum average per cent disease Index (Avg. PDI) recorded in Mallika (50.83%), whereas minimum average per cent disease index (Avg. PDI) noticed in Himsagar (19.96%). The mango cultivar Himsagar showed moderate resistant, Amrapali showed moderate susceptible reaction, Fazli and Langra showed susceptible reaction and Mallika exhibited highly susceptible reaction after the shoot emergence on rejuvenated plants under this agro-ecological system.