Cultural studies and efficacy of fungicides and botanicals against Colletotrichum gloeosporioides Penz. the causal organism of guava anthracnose
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Date
2007-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Guava anthracnose caused by C. gloeosporioides is one of the most important disease of guava. Tarai and Bhabhar region of Uttrakhand and other parts of India. The disease appears on leaves, twigs and fruits and causes sever damage to the fruits during transportation and storage. Keeping in view the seriousness of the disease the present investigation was under taken on cultural character of the test pathogen evaluation of fungicides, botanicals and bio-agent against C. gloeosporioides in- vitro. The pathogen was able to grow in a wide range of synthetic, semi synthetic and natural medium, temperature and pH. Richard‘s medium supported best growth of test pathogen at a temperature of 250C and pH 6.5, respectively. Among the six fungicides evaluated against C. gloeosporioides, Topsin-M, Thiabendazole and Tilt @ 10ppm completely inhibited the growth. In-vitro efficacy of botanicals against the test pathogen, cold water extract of garlic @ 10 per cent was found most effective for complete growth inhibition followed by onion. Amongst the fungal bio-agent tested, Trichoderma viride was found effective inhibiting the growth (42.37per cent) while the bacterial antagonist, Pseudomonas fluorescens was found highly effective as it completely over lapped the growth of test pathogen by 6th day of incubation. The use of botanicals and bio-agent were found cheaper and would be environmentally safer alternative to the fungicides against guava anthracnose and they can explored commercially in Integrated Pest Management stetragy.
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