Fruit infection by Colletotrichum gloeosporioides and anthracnose resistance of some mango cultivars in Thailand.
Dinh SonQuang, Chongwungse J., Pongam P., Sangchote S.
Author Affiliation: Department of Plant Pathology, Kasetsart University, Bangkok 10900, Thailand.
Australasian Plant Pathology 32 : 533-538
Abstract : Infection of mango cv. Nam Dok Mai fruits by C. gloeosporioides [Glomerella cingulata] was studied using artificial inoculation. Under optimum conditions (95-100% RH, 25°C), germination and appressorium formation started at 12 and 14 h, respectively, after deposition of conidia on the peel. After 48 h, 60% of fungal propagules present were appressoria. The fungus could infect mangoes through both pedicel and peel wounds, causing stem end rot and anthracnose in ripe fruit. Inoculation of wounded peel resulted in symptom development in unripe fruit whereas unwounded peel showed no symptoms. Resistance of fruits to disease depended on cultivar. Testing of fruit resistance to the fungus could be conducted by inoculation of fruit at 24 h after harvesting. When inoculated at both pre- and postharvest stages, mango cultivars Nam Dok Mai, Nang Klang Wan and Chok Anan were susceptible to anthracnose whereas Rad and Kaew were relatively resistant.