Causes and control measures of wheat white spike

Every year before the wheat harvest, wheat white ears are common in the wheat field. After several years of observation and research, we believe that the cause of wheat white spikes is mainly root rot, sheath blight, scab, total erosion, etc. Caused by the cause. According to different reasons, the right medicine should be prescribed and the prevention and treatment should be carried out as soon as possible.
1. Sheath blight: an oval-shaped, cloud-like brown lesion on the leaf sheath of the base of the stem at 1 to 3 knots. When the pathogen invades the stem wall, it forms an oval-colored, brown-colored oval-shaped eye spot in the middle, causing water loss and necrosis of the stem wall. Finally, the diseased plant is dead due to insufficient supply of fertilizer and water, forming a white ear of the plant, and it is a single plant in the field. occur. For the prevention and treatment of this disease, 15% of the Jinggangmycin wettable powder can be used for 150g or 20% of the net wettable powder 40g, and 50kg of water can be sprayed. Prevention and treatment should be effectively prevented in the early stage of the disease.
2. Total eclipse: The main symptom is "black-footed white-ear". At the beginning of the disease, the primary roots and secondary roots turned brown and black, the plants were short and sparse, and the leaves gradually turned yellow from bottom to top. After the flowering, the wheat awns turned white, and the whole wheat ears gradually became white ears, and the roots rotted to form black feet. In the new ward or the light ward, the field diseased plants clustered or flaky in the early stage, and then expanded year by year. There is a black plaster-like mycelium at the base of the stem and inside the sheath, and the plant is easily pulled up. The prevention and treatment of this disease should be based on the dressing of the pesticides, and the roots should be controlled twice during the regreening and jointing stages. Each use of 1.5 billion / gram of Pseudomonas fluorescens water dispersible granules per mus, 40 grams of gram bacteria, 60 kilograms of water, sprayed on the base of the stem, so that the liquid flows into the root soil along the blade, can be effective Kill the bacteria in the root soil and reduce the degree of disease.
3. Root rot: The main symptoms are browning of the base, roots and tillers of the stem, the tissue of the diseased part is gradually necrotic, the black mold is on the upper part, and the root is decayed. When the leaves are infected, brown spots appear, and the yellow leaves die. Brown spots and white ears appear in the ear. For the prevention and treatment of this disease, 50% of 20% of rusting emulsifiable concentrate or 35 grams of 4.5% of jade glutinous water can be used per acre, and sprayed with 50 kilograms of water. Spray 7 times after 7 days, spray evenly to make the liquid fully saturate the roots to improve the control effect.
4. Scab: The pathogenesis of the early stage is seedling rot and stem rot, and the late onset is the ear rot. When the ear rot occurs, the water-soaked brown spot on the stalk of the spikelet appears, gradually expanding, in the husk A layer of pink mold is produced at the joint or at the base of the spikelet. After the pathogen invades the cob or the ear stem, the upper spikelet is dead, forming half a white ear, and the grain is dried up. The disease can be prevented by using 50% carbendazim WP 100g or 40% chlorhexidine WP 75g per 1/15 hectare of wheat, spraying 60kg with water, and spraying once after 7 days.