After entering winter, the weather became colder, and poplars entered a dormant phase and stopped growing. Poplar rot disease also stopped developing into the wintering period. The rot pathogenic bacteria are overwintering in the diseased tissue with hyphae, conidiospores or ascospora shells, that is, around the onset of lesions in summer, which facilitates manual centralized prevention and treatment. Therefore, forest farmers should take advantage of the favorable opportunities in winter and leisure, combine management of pruning and tending, and eliminate pollution in a timely manner. This will reduce the base number and harm of diseases in the coming year and will have a multiplier effect.

According to the author's investigation, the occurrence of poplar rot disease in Wuqiao County this year was quite serious. There were several places where there were a large number of dead trees. We reminded forest farmers that they should pay great attention to the prevention and control of poplar rot disease. In winter prevention and control, the following points are mainly addressed:

1. Trim pruning. The first layer of the canopy can be trimmed off with 1 to 2 main lateral branches. The diseased branches should be cut as far as possible. The side branches should not be finished but only the main branch. The pathogens on the branches can be cut off and manually destroyed.

2. Remove fallen leaves. After all the fallen poplar trees are defoliated, the dead branches, fallen leaves and weeds of the pests are cleaned or burned in a timely manner, which helps to reduce the number of pests and diseases, and at the same time reduces the number of other insect pests.

3. Plowing. Before the soil is frozen, cultivating the tree trays or the forests, you can loosen the soil, save the rain and snow, promote root growth, and lay a good foundation for the healthy growth of the plants in the coming year. At the same time, the wintering pests will be exposed to the ground and frozen to death.

4. Scratch the skin. In the early winter or early spring, scraping off old cracks, diseased skin, and insect skins at the branches, branches, and stems of branches and branches, and burning them centrally or deeply, can effectively eliminate the pathogenic bacteria that overwinter in the rough skin. The depth of the skin scraping is preferably yellowish-green in the cortex, and 10 blemish lime sulfur is applied to the wound to protect the wound.

5. The trunk is painted white. After the poplar is defoliated, whitening with a whitening agent at the base of the trunk and big branches can eliminate germs and pests on the trunk, and prevent sunburn, freezing injury and hare gnawing. 25 parts water can be used as whitening agent, 10 parts of quicklime, 1 part of lime sulfur, and 1 part of salt.

6. Spray control. Before the poplar sprouts in the early spring, the lime-spraying agent with 3 to 5 Baume degrees is sprayed twice, or the trunk and branch are sprayed with 50 times of 50% Corbett coating agent.

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