The cloud-like lesion on the leaf sheath of the wheat plant is wheat sheath blight, also known as wheat sharp eye disease, which is a soil-borne fungal disease. After wheat is infected by Rhizoctonia solani, the symptoms exhibited at different growth stages are different. Mainly manifested as rotten buds, diseased seedlings, dead seedlings, flower stalks, rotten stems, dead ears and white ears and many other symptoms. In the prevention and control strategy, comprehensive measures should be taken to combine resistant varieties with improved cultivation measures and pesticide control.
(1) Choose resistant and disease-resistant varieties according to local conditions. Such as Yannong 15, Lumai 6, Lumai 7, Lumai 12, 14, etc., under the same conditions can reduce the disease index 15-20, is a cost-effective measure.
(2) Agricultural control. In severely ill areas and places where conditions permit, wheat and corn can be converted into continuous cropping of non-host crops such as wheat, peanut or wheat and sweet potato. Promote wheat fitness cultivation techniques, such as timely sowing, fine sowing or semi-precision so that the wheat population structure is reasonable. Remove weeds in the field, reduce the humidity in the field, and increase the application of organic fertilizer to improve the disease resistance of wheat.
(3) Chemical control. The focus of drug control should be early sowing, continuous cropping, and excessive or insufficient application of nitrogen fertilizer. In the autumn sowing, 20% powder rust or 10% hydroxy rust can be used according to the seed amount of 0.2%-0.3% and the mixed bacteria 10g mixed seed dressing, can effectively control the occurrence of sheath blight, and treat root rot and total eclipse White powder and rust at the seedling stage. The Chinese Pesticide Network has learned that when the wheat is in the jointing stage, when the disease rate is more than 15%, 25% carbendazim WP or 15% hydroxy rust, 33% thyrox WP can be used per 667 square meters. , or 20% powder rusting emulsifiable concentrate 50-75 grams or 5% of Jinggangmycin 150-200 ml sprayed on the wheat base with 100 kilograms of water.
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