Virulence Variation of Colletotrichum gloeosporioides (Penz.) Penz. and Evaluation of Varietal Susceptibility against Mango Anthracnose
2014
Archana, S. | Prabakar, Kumaraguru | Raguchander, T.
Anthracnose caused by Colletotrichum gloeosporioides is a major disease in many parts of the world where the climate is suitable for mango production to be the most important field and post harvest phase. The aim of the present work was to analyze virulence nature of C. gloeosporioides in the differentiation of isolates obtained from mango fruits and their potential to cause disease in different varieties. Survey was conducted in ten different districts of Tamil Nadu at post harvest phase. From the survey twenty six isolates of C. gloeosporioides were isolated and identified using morphological characters. Among the five artificial inoculation methods tested, pinprick plus spore suspension spray was the best suitable method. By this method out of twenty six isolates used, MCG 16 was identified as virulent isolate based on lesion diameter, per cent disease incidence and virulence index produced on inoculated fruits. MCG 16 was further used to test the varietal susceptibility of twelve different mango varieties and found that Neelum was the highly susceptible variety, in which the progression the lesion diameter was increased with increasing the incubation period.
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