Symptoms: Powdery mildew is mainly harmful to the leaves of Euonymus japonicus. The lesions are mostly distributed on the leaves and produce mildew and mildew. When the disease is serious, backs and shoots can also occur, resulting in leaf shrinkage deformity, new shoots twisting, shrinking and stopping, and causing defoliation shoots. At the beginning of the disease, many white and small round spots are scattered on the leaves. As the lesions gradually enlarge, irregular large spots are formed and even occupy all the foliage. If the white surface of the lesion is erased, a yellow round spot can be found at the site of the lesion.
Occurrence pattern: The germs use mycelium (ie, gray film-like fungus layer) to overwinter in the dead tissue of the Euonymus japonicus or between the bud scales. In the spring of the second year, a large number of conidia were produced in the leafy and growing stages of Euonymus japonicus through air flow transmission and became the primary source of infection for the disease. The pathogens parasitize the surface of the host foliage, resulting in absorption of nutrients within the epidermal cells of the sipperm, and a large number of spores that infect the leaves and shoots in spring, summer, and autumn each year. Summer heat is the main cause of the disease.
Prevention:
1. To improve the cultivation conditions, we should choose land plots with high topography, dryness, sufficient sunlight, no water accumulation, and deep and fertile soil.
2. Strengthen fertilizer and water management, increase phosphorus and potash fertilizer, and appropriate amount of nitrogen fertilizer; pay attention to drought resistance and drainage, make seedlings grow robustly, and increase disease resistance.
3. Reasonable pruning, cutting sick leaves diseased leaves. Do a good job in the work of clearing the gardens in winter, and remove the diseased leaves and leaves. The diseased branches of the diseased leaves are cut off and burned in time during the growth period, which can effectively reduce the initial infestation bacteria source and re-infestation bacteria source.
4. Proper use of pharmaceuticals in a timely manner, attention to alternate use of agents to avoid powdery mildew resistance. The spray should be uniform, pay attention to spray guilt and back. In winter, it was treated with lime sulfur for two times, with intervals of one month. The Euonymus japonicus leaves and growth stages, especially from April to May and from September to October, can be controlled by the following agents: 800-1000 times of bacteria sharks, 2000-3000 times of Penicillium, 20% of triadimefon 800 To 1000 times, 70% thiophanate-methyl 800 times, 50% Benzene 1000 to 1500 times, 50% of the bacterium 800 times and so on.
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