Pay attention to the prevention of large-leaved boxwood powdery mildew in summer
In high-temperature, rainy summer season, Euonymus japonicus is susceptible to powdery mildew.
Powdery mildew mainly harms the leaves of Euonymus japonicus and can also harm the stems. At the beginning of the disease, yellow dots begin to appear on the leaves, and then gradually develop and expand into round or oval lesions with a white powdery mildew layer on the surface. If the white powder on the surface of the lesion is erased, yellow round spots can be seen on the lesion site. In general, the lesions are mostly distributed on the foliage. In severe cases, the backs and shoots of the leaves also occur. The blades are deformed, the new shoots are distorted, and the atrophy stops.
To prevent and treat phytobluary powdery mildew, the following measures can be taken:
1. Improve the cultivation conditions. When Euonymus japonicus is used as a greening material, it is mostly planted densely, and it is patterned after trimming. Therefore, excessive planting density is the main reason for the occurrence of powdery mildew disease. Therefore, improving the cultivation conditions is the main way to prevent and control diseases. When cultivated, try to choose or create a higher ground section for the cultivation of Euonymus japonicus, and under the premise of guaranteeing afforestation and beautification, reduce the planting density as much as possible to facilitate ventilation and light transmission, and reduce or reduce the incidence of powdery mildew.
2. Strengthen fertilizer and water management. Appropriate increase in the amount of phosphorus and potassium fertilizers in the cultivation and management process, reduce the amount of nitrogen fertilizer, can increase the disease resistance. Reduce the number of watering, improve plant microclimate and reduce air humidity. When watering, use the watering under the plant. Do not use sprinkler irrigation or watering on the plant to reduce the incidence of powdery mildew.
3. Trim in time. According to the requirements of landscaping and greening, timely pruning and trimming can not only timely remove diseased branches and diseased leaves, but also improve the overall ventilation and light transmission, and prevent the spread of powdery mildew. The pruned and damaged leaves should be promptly removed, destroyed and prevented from spreading.
4. Chemical control. In the early stages of the disease, 25% triadimefon 800 to 1000 times and 70% thiophanate-methyl 800 times were used for spraying. When spraying, it is necessary to pay attention to the internal spasm and the back of the leaves.
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