Plum leaf leaf disease prevention and treatment
First, the harm symptoms Occur mainly in the spring, the first is the new hair buds and new leaves, the tender shoots between the shortening of the internode, dense leaves, leaf surface thickening, showing a meaty, rough surface, curled to the back of the leaf. The diseased leaves appear yellow, red or purple at the beginning, and then gradually turn grayish, with powdery appearance. In severe cases, the tip of the disease is dead, the tree vigor is weak, and the amount of flowers is reduced. Second, the incidence of the law The ascospores and spores were overwintered on the inside and outside of host bud scales. The hyphae is one year old or perennial. The spores have two types: thin-walled and thick-walled. The former can continue to bud, and the latter has the effect of dormancy and resistance to adverse environment. After the bad environment is passed, it germinates to form spores. Stained host. Diseases began to infect in the first half of April of the following year. The disease was severe in early May and the disease stopped in June. The germs were infected once a year and occasionally reinfested. However, due to high temperatures and unfavorable conditions, the hazard is not significant. The cool, humid climate is best suited for spore germination and infestation. The temperature of 20°C is most suitable for the growth of germs, and the growth of germs at 28°C is inhibited. The disease cannot occur. In early spring, even with rain or foggy weather, adverse diseases occurred. Third, prevention and control technology 1. If you need to trim in winter, be sure to pick up the fallen plum leaves and plum branches and clean the plum garden. In combination with winter cutting, in the management of topdressing, high-quality organic manures and phosphorus and potassium fertilizers are applied with less application or no application of nitrogen fertilizer to promote the robust growth of plum branches and leaves, and to improve the resistance of the plants to plum blossom leaf leaf disease. 2. If pruning is needed in the spring, the diseased branches and diseased leaves that have been cut off will be brought out of the park and burned in order to reduce the source of germs in the next year. In the removal of diseased branches and diseased leaves, the scissors can be soaked in a 1:1:100 Bordeaux mixture for 3 to 5 minutes and then cut. 3, in the plum blossom buds just expanded, spray wave 5 degrees of lime sulfur, or 1:1:1 00 Bordeaux mixture. Spraying 1 to 2 times a year for 2 to 3 consecutive years with good results. Note that when spraying, be sure to spray evenly so that the liquid forms a film. 4. For potted plum blossoms, besides pruning and cutting leaves in winter and spring seasons, and keeping diseased branches and diseased leaves away from the flowerpots, the environment around the flowerpots should be kept dry. This will help inhibit the occurrence of germs. . If plum blossom leaf defoliation has already occurred, spray the pots according to the above medicine and concentration.
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