Why do kidney beans get powdery mildew? What medicine can be used to treat powdery mildew on kidney beans?

Kidney beans are very common in our daily life. People often like to grow some at home because of their high nutritional value and good health care functions. However, many people have encountered some diseases and insect pests when growing them. So why do kidney beans get powdery mildew? What medicine can be used to treat powdery mildew on kidney beans? Let's take a look.

Why do kidney beans get powdery mildew?

Powdery mildew mainly harms kidney bean leaves. The typical symptom is a white powdery mildew layer on the lesions. In severe cases, the leaves are covered with mildew, or both sides, and finally the leaves turn yellow and fall. The pathogen mainly overwinters on diseased remains in the field. The temperature and humidity are suitable for germination and infection. The temperature of 20-30℃ and the relative humidity of 40-95% are most suitable for powdery mildew to occur.

What medicine is used to treat powdery mildew on kidney beans

In the early stage of the disease, azoxystrobin can be used. This is because the protective effect of this drug is stronger than other pesticides, and the therapeutic effect is moderate. Once the disease is serious, azoxystrobin plus difenoconazole can be used in combination. Other formulas such as oxathiapiprolin plus mancozeb, prochloraz plus flusilazole, thiophanate-methyl plus propiconazole, etc. Unused new drugs can be used alone if they have protective and therapeutic effects. Those that have been used for many years should be used in combination. Pay attention to rotating the drugs.

In the rainy season, it is best to use rain-resistant varieties, such as propiconazole, oxathiapiprolin, flusilazole, etc. Because some pesticides are expensive, it is best to use them only once a season. Don't think that this drug is good and use it multiple times in a row.

How to Avoid Powdery Mildew on Kidney Beans

Avoid repeated cropping, select disease-resistant varieties, remove diseased plant residues in the field after harvest, burn and bury them in batches to reduce the source of bacteria. Apply more organic fertilizers, strengthen water and fertilizer management, irrigate frequently with small amounts of water, avoid frequent alternations of drought, and improve disease resistance. In the early stages of the disease, the following agents can be used for rotation and alternating prevention and control.