Symptoms
The onset usually begins in the tillering period, and then spreads horizontally in the field. Plants and plants communicate with each other. The resistance to rice weeping decreases as rice enters the pregnancies and heading stages, and the disease rapidly worsens, gradually expanding from the lower part of the rice plant to the upper part of the leaves. From the seedling stage to the panicle stage can be disease. Leaf sheathing disease produces dark greenish water-blown edge blurs near the surface of the water. It gradually expands into an oval or moire pattern. The middle part is grayish green or gray-brown. When the humidity is low, the middle part is yellowish or grayish, and the central tissue is damaged. Translucent, dark brown edges. When the disease is severe, several lesions fuse to form a large lesion, showing an irregular cloud-like spot, often causing the leaves to yellow and die. Leaf lesions were also moire-like, the edges faded yellow, the lesions appeared green when the lesions were fast, and the leaves quickly rotted. The symptoms of the stalks were similar to the leaves. The later stage was yellow-brown and easily broken. In the ear and neck, the victim was initially tainted with green, and later became gray-brown. He often failed to head the ear, and the ear of the ear had more pods and the grain weight decreased.
Control methods
The chemical control before the epidemic peak of sheath blight is an effective measure to control rice sheath blight. In the late stage of rice tillering, the rate of diseased holes reached 15%, that is, application of pesticides. It is preferred to use 20% Jinggangmycin powder 100g; or 43% tebuconazole (Holiker) suspension agent 20ml plus water 40kg is evenly sprayed on the basal part of the rice. When rice is used in the booting stage, it is possible to choose multiple compound pesticides that can treat rice sheath blight, rice blast, and rice smut, such as the harvest of nymph rice.
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