Anthracnose is a major disease of Annona squamosa. From the beginning of the seedlings, it can be diseased for a lifetime. The hazards include leaves, branches and fruits, resulting in dead seedlings, fallen leaves, black leaves, and rotten fruit, which greatly affect the yield. First, the symptoms of leaves: oval or irregular shaped spots, brown, dark brown spots to the edge of the lesion to black. Branches: The lesions on the shoots are round and brown. Fruit: Round spots, water spots, brown, late dark brown to black, the surface can produce orange-red sticky spores. Seedlings: Leaves and buds become brown and necrotic at seedling stage. Second, the pathogenic bacteria and disease conditions Anthrax anthracnose pathogens are small round cysts of Ascomycota. The bacterium is generally overwintering on diseased leaves, diseased branches, and diseased fruits of diseased plants, and is widely distributed. In the spring and early spring, when the warming season returns, the germs will produce conidia, which will spread with wind and rain. It will damage tissue from skin wounds and stomata and cause tissue necrosis and symptoms. From March to May, the spring rain is frequent. The spring fruit is most susceptible and becomes black fruit. From November to next February, the foliage and seedlings are more harmful. The suitable temperature for the growth of this bacterium is 21-28°C, which is easily induced by high temperature and high humidity in the spring and summer season. Poor cultivation and management, partial application of chemical nitrogen fertilizer, shady or low-lying orchard, and excessive humidity are beneficial to the disease. Third, control methods 1 to strengthen the cultivation and management, increase organic fertilizer, pay attention to the balanced supply of fertilizer and water, enhance plant resistance to disease. 2 pay attention to do a good job in the pastoral clean, timely pruning, so that the orchard air and light. Collect diseased leaves, diseased branches, and diseased fruits, and burn them to reduce the sources of pathogenic bacteria. 3 timely application of pesticides to protect young shoots, young fruit. New shoots and spring and autumn fruits and fruit production period, apply 1-2 times in time. 70% thiophanate WP 800-1000 times, or 50% TU wettable powder 500-600 times, or 75% chlorothalonil wettable powder 800-1000 times, or more than 50% Dimethicone WP 500 times.
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