Rust affects the yield of kidney bean how to control the rust of kidney bean

Rust is the main disease of kidney bean, which is common, which will destroy the nutritional area of bean leaves, cause leaf injury and make the plant lose water, which will seriously affect the yield.

Bean rust

1. Pathogenic bacteria. The disease is caused by the infection of fungal basidiomycetes submonospore rust. The pathogen overwintered on the remains of seeds or diseased plants and could survive for 2-3 years. In the following year, under the condition of suitable temperature and humidity, the pathogen germinated, produced hyphae and microspores to invade the host, regenerated summer spores, spread with wind and rain, and then infected.

2. Symptom identification. Rust-like disease spots appear on the leaf surface of the disease, and the leaf surface is destroyed when it is dense, which accelerates the loss of water and withering yellow, wrinkling and shedding; when the leaf vein occurs, the leaf becomes deformed; the tail end of the diseased pod becomes smaller and curved; in severe cases, it is also harmful to petiole, stem and pod.

3. The condition of the disease. High temperature and humidity, dew in leaf area, disease prone to Rain Water; weak disease resistance of plants, low-lying bean fields, poor drainage, over-dense planting, poor ventilation and light transmission; tatami frames causing over-wet microclimate in the field will be conducive to the occurrence of diseases.

4. Prevention and control technology.

⑴, remove the litter in the field after harvest, and concentrate on destruction.

⑵, rotation with leafy vegetables, melons and other non-leguminous vegetables.

⑶, select excellent disease-resistant kidney bean varieties.

⑷, strengthen field management, apply sufficient fertilizer and water, not partial application of nitrogen fertilizer.

⑸, remove diseased leaves and old yellow leaves in time, and take them out of the bean field or burn or bury them.

⑹, spraying in time at the initial stage of the disease, you can choose 50% carbendazim wettable powder 800x liquid, or 65% Dysen zinc wettable powder 500x liquid, or 50% wiruiling wettable powder 1000 times liquid, spray green beans every 7 to 10 days, and use medicine continuously for 2 times for 3 times.