Common diseases of peanuts include stem rot, root rot, leaf spot, rust, etc.: Co.,
1. Stalk rot
Symptoms: The cotyledon of the seedlings is dark brown, dry and rotted, and the petiole extends to the base of the stem to form a yellow-brown water-immersed lesion. Finally, it becomes dark brown and rot, and the disease occurs later. The water-immersion disease occurs at the base of the stem or the main branch. Spotted, yellowish brown, dark brown, and the ground is wilted and dead.
Control methods: stem rot is mainly based on seed-borne bacteria, continuous cropping is serious, and early sowing is serious. Therefore, reasonable rotation should be carried out. Before seed storage, it should be fully dried. Before sowing, it should be sun-dried and selected, without mildew. Seeds with poor quality, seed disinfection, 50% carbendazim based on the seed amount of 0.3% for seed dressing.
2, root rot
Symptoms: The base of the stem is water-immersed, yellow-brown, the plant is short, the leaves are dry from the bottom to the top, the main side roots are brown and rotten, and only the main root of the brown dry shrinkage is left in the later stage.
Control method: rational rotation, strict selection and sun-breeding, seed dressing with 50% carbendazim with 0.3% seed amount, and spray with 50% carbendazim 1000 times solution at the beginning of the disease.
3, leaf spot disease (mainly including brown spot, black spot)
Symptoms: brown spot disease lesions are round, dark brown, large, yellow halo on the outer edge of the lesion, gray mold in the later stage; black spot disease lesions round, dark brown, no yellow halo around the lesion The lesion is smaller than brown spot.
Control method: rational rotation; use resistant varieties; high temperature and rainy July and August is the key period to prevent leaf spot disease, spraying 50% carbendazim 800 times liquid or 75% chlorothalonil WP 600 times in the early stage of the disease Liquid or 70% mancozeb 800 times, spray once every 15 days, a total of 2-3 times.
4, flower rust disease
Symptoms: The basal lobe begins to occur first. The leaves produce yellow erythema, small shape, and there is a narrow yellow halo around it. After the cleavage of the epidermis, rust-colored powder is scattered. In severe cases, the leaves are yellow and dry and fall off.
Control method: In the initial stage of the disease, 75% chlorothalonil 600 times solution or 25% powder Ning 500 times solution is used for the whole field spray.
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