STUDIES ON VARIABILITY OF Colletotrichum gloeosporioides (Penz.) CAUSING ANTHRACNOSE OF MANGO
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Date
2017-06
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University of Horticultural Sciences, Bagalkot (COLLEGE OF HORTICULTURE,UHS CAMPUS, GKVK POST, BANGALURU)
Abstract
Mango (Mangifera indica Linn.) is an important fruit crop in India and other tropical and subtropical countries of the world. Among the fungal diseases causing economic losses, the most important one is anthracnose caused by C. gloeosporioides Penz. and Sacc. (Teleomorph-Glomerella cingulata). 10 pathogenic isolates of Colletotrichum gloeosporioides were obtained from different agroclimatic zones of Karnataka and the variability study indicated that, all isolates exhibits variation in colony character, type of margin, colony colour, topography and pigmentation in the culture. Cg-8 and Cg-4 isolate showed excellent sporulation; Cg-3 isolate had fast growing ability (9.5 cm) at 12th day; Cg-8 isolate showed highest virulence nature compared to other isolates. Among nine mango seedling varieties and eight varieties of mango fruits, Dasheri (seedlings) and Mallika (fruits) exhibited moderately resistant to C. gloeosporioides in the green house and in vitro conditions respectively. Among the botanicals and fungicides evaluated, fresh plant extract of Simarouba @ 7.5% has recorded (46.34 %) inhibition, Aloevera @ 7.5% (24.93 %) as dry plant extract under in vitro condition. Whereas, combi product of fungicide, flurilazole 12.5% + carbendazim 25% SE and systemic fungicides propiconazole 25% EC @ 0.1, 0.2 & 0.3 %showed complete inhibition of C. gloeosporioides under in vitro condition.