Control of gum blight on the shoot of planted mango

The gummy disease of mango shoot mainly harms the shoot and trunk, causing it to wither, but it can also harm seedlings and fruits. Most of the damage to the seedlings appeared dark-brown necrotic spots from the bud contact or wound, which quickly developed up and down, resulting in scion necrosis. The trunk or branch was damaged, the cortical necrosis showed ulcer symptoms, the diseased part was brown gum after the initial white flow, the branches above the diseased part withered, the upper black grain spots, the brown leaves on the dead branches, rolled upward, easy to fall, and the fruit dried and shrunk. New branches are sometimes pulled out under the disease, but the growth is poor and the leaves fade.

The pedicel damage produces longitudinal cracks, and the disease spot extends to the young fruit, which can make the young fruit fall off. The mature fruit showed symptoms in the soft ripening stage, with watery soft spots on the pedicel at first, then expanded into large gray-brown spots, and exudated sticky juice, and the inner fruit showed brown soft rot.

Prevention and control methods: 1 mechanical damage and longicorn beetle harm should be prevented during cultivation. 2 take bud strips from the robust mother tree, the grafting knife should be disinfected with 75% alcohol, and the blood of the budding seedlings should be planted in a dry place with air circulation, especially to keep the interface dry, and pay attention to ventilation after the budding survives and is unbound. (3) combined with plastic surgery and pruning, the diseased branches were cut off. When cutting, cut off 20-30 cm below the disease; the lesion on the trunk should be cut off with a sharp knife to see healthy tissue, and then apply Bordeaux paste or 200 times of 70% methyl thiophanate wettable powder to mix cow dung. (4) 3% copper oxychloride suspension can be sprayed during flowering. In the young fruit stage, 0.6% Bordeaux solution, 70% methyl topiramate wettable powder 800-l000, or 50% carbendazim wettable powder were sprayed with 0.6% Bordeaux solution or 50% carbendazim wettable powder. It is usually sprayed once in 10-15 days, for a total of 3 times.