A wet-weather fungal disease, common on mango and yam. Infection of mature fruit leads to losses in storage.Stigmina causes black spots on the leaves, which may merge to form large black areas. Glomerella is the sexual stage of the fungus, and Colletotrichum the asexual stage. Once the climacteric period of the fruit starts, lesions begin to develop. Many other crops are hosts of this fungus, including avocado, capsicum, coffee, eggplant, papaya, tomato and yam. Summer is the time you should start seeing developing mangos on your tree. Under favorable conditions, spores are dispersed and invade young twigs causing twig dieback in some cases. Use plant protection products safely. Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community. A leading agrochemicals, seeds and farm equipment’s company in Africa. Glomerella cingu-lata (Ston.) Glomerella cingulata (it also has the name of Colletotrichum gloeosporioides). Wider plant spacing inhibits severe epidemics. On leaves, lesions start as small, angular, brown to black spots that can enlarge to form extensive dead areas. CULTURAL CONTROLIt is important to prune trees to allow air to flow freely through the tree canopy to reduce humidity. In wet weather, flower blight results in low yield and shoot dieback. After initial establishment in the fruit, the fungus remains latent or dormant until the fruit begins to ripen. Another fungus also causes leaf spots: Scolecostigmina mangiferae (see FactSheet no. Dark depressed circular lesions develop on the ripening fruit and increase rapidly in size. They are produced on lesions on leaves, twigs, panicles and mummified fruits. Larger fruits aborted because of other physiological causes are usually mummified and the mummies are invaded saprophytically by the fungus on which they sporulate profusely. They have good flavour, and flesh with low-fibre. Diseased twigs should be removed and burnt along with fallen leaves. WordPress Download Manager - Best Download Management Plugin. Photo 2. Always read the label and product information before use. Glomerella is the sexual stage of the fungus, and Colletotrichum the asexual stage. RESISTANT VARIETIESIndo-Chinese/Philippine varieties are said to have some resistance to the fungus and need to be tested in Pacific island countries. Asia, Africa, North, South and Central America, the Caribbean, Europe, Oceania. Young leaves are most susceptible to infection (Photo 1). An important disease. Let us know if you liked the post. AUTHORS Helen Tsatsia & Grahame JacksonPhotos 1-3,5 Kohler F, Pellegrin F, Jackson, G, McKenzie E (1997) Diseases of cultivated crops in Pacific island countries. However, it is not always easy to distinguish between diseases caused by Glomerella and Stigmina. Pirie Printers Pty Limited, Canberra, Australia. Panicle anthracnose or blossom blight affects both the inflorescence stalk and the individual flowers. If using carbendazim, allow 3 litres of dip per kilogram of fruit. Alternating different fungicides throughout a plant’s season prevents the fungus from developing resistance over any of the fungicides. Worldwide. The centers of these lesions often become covered with pink, gelatinous masses of spores especially during moist, … Spauld and Shrenk. Infected plants develop dark, water soaked lesions on stems, leaves or fruit. Photo 4. Blighted flowers are dry and their color varies from brown to black. Anthracnose of mango is caused by Colletotrichum gloeosporioides Penz. Apple iOS Edition. The following fungicides are recommended for prevention and eradication of mango anthracnose disease. In advanced stages of infection, the fungus produces acervuli and abundant orange to salmon pink masses of conidia appear on the lesions. These diseases are serious in high rainfall areas and difficult to control. Trees should be less than 4 m tall for easy management and harvesting. South Pacific Commission. Lesions of different sizes can coalesce and cover extensive areas of the fruit, typically in a tear-stain pattern, developing from the basal toward the distal end of the fruit. Do not compost infected leaves, fruit or stems and thoroughly clean up garden areas in the fall, after harvest, to reduce over wintering sites for the fungal spores. On mature fruits, the fungus remains as pinpoint infections until the fruit ripens; then the infections form dark brown to black spots with orange-pink spore masses (Photo 2). fungal infection caused by the fungus Colletotrichum gloeosporioides Mango anthracnose is a fungal infection caused by the fungus Colletotrichum gloeosporioides and is presently recognized as the most important field and post-harvest disease of mango worldwide. Here’s how: Generally found in the eastern part of the United States, anthracnose is caused by fungi in the genus Colletotrichum, a common group of plant pathogens that are responsible for diseases on many plant species. The post-harvest phase is the most damaging and economically significant phase of the disease, which directly affects the marketable fruit rendering it worthless. Post-harvest dips in fungicide (carbendazim) and hot water (both treatments are for 5 minutes at 52Â°C) control fruit infections, preventing storage rots.