How to prevent and treat Populus euphratica powdery mildew

Euonymus japonica powdery mildew is a common disease on Euonymus japonicus, and it is widely distributed. When it is harmed, a white powdery mold layer appears on leaves and shoots, which reduces its ornamental quality.

The law of incidence

The pathogenic bacteria overwintered with mycelium in the killed tissues of Euonymus japonicus and produced gray membranous bacilli. Hunchun produced a large number of conidia in the leaves and growing stages of Euonymus japonicus through air flow transmission and became the first source of infection. The pathogens parasitize on the surface of the host foliage, resulting in absorption of nutrients within the epidermal cells. A large number of spores infest the leaves and shoots in spring, summer, and autumn each year. Summer heat is not conducive to disease development, and rainy seasons and high humidity conditions favor the disease. Occurrence, cool and rainy autumn is conducive to disease. Planted in the shade of Euonymus japonicus disease incidence; young leaves, new shoots, the incidence of heavy; when the leaves of Euonymus fortunei is too dense when the disease is severe.

Control methods

1. Improve the cultivation conditions, and plant them in areas with dry, bright light, no water, and deep and fertile soil.

2. Strengthen fertilizer and water management, increase phosphorus, potash fertilizer, and appropriate amount of nitrogen fertilizer; pay attention to drought resistance and drainage, make seedlings grow robustly, and increase disease resistance.

3. Combine pruning and cut off diseased leaves.

4. Proper use of pharmaceuticals for timely prevention and treatment, attention to alternate use of agents to avoid powdery mildew resistance; spraying careful and thoughtful, pay attention to spray the internal hemorrhoids and leaves. In winter, three degrees of lime sulphur was used to prevent and cure twice. The interval was 1 month. Euonymus japonicus leaves and growth stages, especially from April to May and September to October, can be controlled by the following agents: 25% triadimefon 1500 to 2000 times, or 70% thiophanate-methyl wettable powder 800 to 1000 times the liquid, or 50% Benzoit WP 1000 to 1500 times, or 50% TU wettable powder 800 to 1000 times, etc. Immediately when the disease begins, 7 to 10 days Spray once, spray 4 to 5 times continuously.

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