Many plants and vegetables are inevitably affected by pests and diseases. If you want them to grow well, you need to organize a series of prevention work. The same is true for cowpea, the most common ones are powdery mildew, anthracnose and gray mold. Once the disease occurs, it is necessary to take timely preventive measures.
How to control the gray bean disease of cowpea? Cowpea gray mold is a fungal disease against cowpea attack. Leaves, stems, flowers, pods can be infected, generally the roots are upwards. The harmful fungus, Botrytis cinerea, belongs to the subgenus. The disease can be controlled by field management or chemical spraying.
Control method:
Pesticide control. After planting, it is found that sporadic disease plants start spraying, and can spray 65% ​​methyl sulfonate (Wanmuling) wettable powder 1100 times liquid or 50% procymidone (speed keiling) wettable powder 1500 times liquid or 50% iprodione (puffin) wettable powder, 50% vinyl bacteria nuclear (Nongliling) wettable powder 1000-1500 times liquid, 30% iprodione·cyclohexane zinc (grey king) emulsifiable concentrate 1000 Double solution, 45% Tec lot suspension 1000 times solution, 50% 100·Sulphur suspension 600 times solution, 50% carbendazim suspension 800 times solution or 40% pyrimethanil (Sega) suspension 1200 times solution 50% fungicide WP 800 times solution, 28% gray mold WP 660-700 times solution. Spray once every 7-10 days for 2-3 times.
Symptoms of cowpea gray mold can cause disease in stems, leaves, flowers and pods. After the cotyledon cotyledon is damaged, it is water-soaked, soft and drooping, and then the gray-white mildew layer, ie the conidiophore and conidia of the pathogen, grows at the leaf edge.
The disease of the leaves began from the edge of the leaf, and the diseased part showed dark green water-immersed lesions. The lesions had a large concentric pattern and were easily broken at the later stage. The stems are infected, and the pathogens invade from the stems and branches. The pathogenic part forms a dark green water-soaked spot, and then expands around the stems.
The pods first infect the filaments at the ends of the petals or pods that have fallen after the flowering of the pods, and then spread to the pods. The lesions are light brown to brown in the early stage, then gradually soft rot, and the surface is gray mold layer. In the root and neck, there are markings on the ground at 11 to 15 cm, the periphery is dark brown, and the middle is light brown or light yellow. When dry, the epidermis of the lesion ruptures to form a fibrous shape. When the humidity is high, there is a gray mold layer.
The transmission route of cowpea gray mold is the summer or winter of mycelium, sclerotium or conidia. The overwintering pathogens live with the hyphae in the sick body, and continue to produce conidia for reinfection.
The sclerotia is produced in the conditional discomfort department, and the survival period in the field is long. When suitable conditions are met, the hyphae directly invade or produce spores, which are sprinkled by rainwater or spread with diseased bodies, water, airflow, agricultural tools and clothing; Rotten sick pods, diseased leaves, sick tendrils, and fallen sick flowers fall on the health department.
Other diseases and control of cowpea 1. Powdery mildew: It mainly damages leaves and can also invade stems and pods. The leaves are infected, and the yellowish brown spots appear on the back of the initial leaves. When enlarged, they are purple-brown spots, which are covered with a thin layer of white powder. The pathogen is a fungus of the sub-sac. Control method: spray 70% of the WP WP 500 times solution, or 40% ruthenium WP 600 times solution, 50% sulphur suspension 300 times solution, powder must clear 150 times solution.
2, anthracnose disease: the disease produces fusiform or long-shaped lesions on the stem, initially purple-red, sunken, heavy damage to the pod, forming reddish-brown lesions, is a fungal disease. The disease is severe in many exposed and humid conditions.
Control method: seed treatment with 0.4% of carbendazim or thiram double wettable powder for seed dressing or soaking with 60% anti-mildew 600 times solution for 30 minutes, washing and drying, sowing. In the early stage of the disease, spray with 70% of the 500 times solution or 800 times of the anthrax, and apply a spray of 50-60 kilograms of water or 500 times of the special spectrum. 5-7 days, 2-3 consecutive times.
Cowpea gray mold is very easy to develop in the process of cowpea planting. If it is not timely prevented, it will affect the growth of cowpea. However, as long as the early prevention and protection and the later protection are done, it can be effectively avoided. Generally, we can start from two aspects of agricultural control and chemical control.
The website of this paper: The path of disease and control of cowpea gray mold
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