Summer rice sheath blight prevention and control method
Summer rice sheath blight prevention and control methods: The onset of rice sheath blight usually begins in the tillering stage, and then spreads in the field. The strain spreads between the plants and the plants. The resistance of the rice to the pregnancy and heading stage is weakened, and the disease is rapidly aggravated from the lower part of the rice plant. Gradually the upper blade extends vertically. It can occur from the seedling stage to the ear stage. Leaf sheath infection produces dark green water-immersed edges with blurred plaques near the surface of the water. It gradually enlarges into an elliptical or moire shape, with a grayish green or grayish brown in the middle, and a pale yellow or grayish white in the middle when the humidity is low. Translucent, dark brown edges. When the disease is serious, several lesions fuse to form large lesions, which are irregular cloud-like spots, often causing yellowing and dead leaves. The diseased spots of the leaves are also cloud-like, with yellowish edges. When the disease is fast, the lesions are stained green, the leaves are quickly rotted, the symptoms of the stems are like leaves, and the later stage is yellow-brown and easy to fold. At the beginning of the neck injury, it was stained green, and then it became grayish brown. It was often unable to head, and there were more nets in the heading and 1000-grain weight.
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We need to prevent and control rice sheath blight before and after the peak of the sheath blight, which is an effective measure to control rice sheath blight. In the late stage of rice tillering, the rate of disease points is 15%, that is, the application of pesticides. It is preferred to use 100% of the 20% Jinggangmycin powder; or 43% of tebuconazole (Haoli) suspension 20 ml of water and 40 kg of water to be evenly sprayed on the base of the rice. When using rice at the booting stage, you can choose a multi-component pesticide that can treat rice sheath blight, rice blast, and rice smut, such as the harvest of Xianyu rice.