Myrica rubra (10ur.) Sieb et zucc. It is a woody plant of the family Myrica. Yangmei uses root, bark and fruit as medicine. With scattered hemostasis, pain function. Located in the provinces south of the Yangtze River basin.
Symptoms are mainly trunk damage. At the initial stage, milky white bulges appear on the diseased branches, and the surface is smooth. Afterwards, the tumors gradually expand and form. The surface is rough and rough, and the corky substance becomes hard brown or dark brown, resulting in severe branches.
The pathogen Pseudomonas syringae pv. myricae C. Ogimi said Pseudomonas syringae pv. Yangmei, a bacterium. The cells are short-barreled, blunt at both ends, with 1-5 flagpoles, Gram-negative, producing a smooth white circular edge on the beef juice agar medium, slightly raised in the center, with bright light, Later turned white.
Transmission Pathogeny and Pathogenic Conditions The pathogenic bacteria in the diseased branches of the tumor overwintering, humidity in the spring of the following year is large, the surface of the tumor overflows bacilli, transmitted by wind and rain, and invaded from the host leaves or wounds. The incubation period is 20 to 30 days after onset. It also caused the pus to re-infect continuously, causing its popularity. In May and June, when it was rainy, it was prone to onset. The management was extensive and the badly drained Yangmei Garden was seriously affected.
Prevention and control methods (1) Selection of disease-resistant varieties such as Hongmei, small charcoal plum, and early large species. (2) The fruit picking and plum garden management must be carried out with care. Minimize the wounds, and if there are wounds on the branches, apply Bordeaux fluid and other wound protection agents in time. When pruning in winter and spring, take care to cut off the sprigs of the tumor and remove the tumor on the big trunk. The wound is disinfected with 80% 402 antibacterial agent 50 times liquid or copper sulfate l00 times liquid, and then apply the wound protection agent. (3) Spray 1:2:200 times of Bordeaux mixture before pumping spring shoots. After typhoon attacks or fruit harvesting, spray Bordeaux mixture once more.
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