Poplar canker disease prevention measures
2018-06-13 11:01:15
Poplar canker disease is a common occurrence of poplar trees and the damage is getting worse. Especially in the nursery of poplars, some nursery places are almost sick, and the disease is very severe. Must pay full attention to it. Cause The pathogen of poplar canker disease is a kind of bacteria. It is wintering in the bark, spread by rainwater, insects, etc. Percutaneous holes and wounds are harmful to invasion. The incubation period is 1-2 months. The onset began in April. There were two episodes of climax in one year, an onset of episodes in May and June, and a slow onset in July and August. The second epidemic in September often occurred on transplanted big seedlings and weak trees. At the beginning of the onset of symptoms, blisters appear near the skin pores of the trunk, and the hand pressure causes the fluid to flow out. After the blisters rupture, the odor-laden fluid flows out and there is a large amount of bacteria inside. In the end, the diseased section collapsed into ulcer spots and the lesions turned brown and rot. When the disease is serious, dense blisters can cause all bark to rot, affecting sparsely causing the whole plant to die. Prevention and control First, strengthen fertilizer and water management, increase tree vigor, and avoid trauma. The second is to transplant large seedlings, whitewash the paint in early spring, or use 0.5 Baume degree of lime sulfur, or 1:1:160 Bordeaux spray to prevent infection. If the seedlings used to infect the disease, you must scrape the lesions and disinfect it with 300 times formaldehyde. In addition, field management must be strengthened to increase tree vigor.
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