First, the symptoms of the disease The disease mainly damage the leaves and leaf sheath, stem occasionally occur. At the time of onset, pale yellow spots or short streaks appeared on the first and second young leaves of the young wheat seedlings. With the growth of the leaves, the lesions expanded and the symptoms became more pronounced during the parturition period, and streaked from the base of the leaves to the tips of the leaves. The yellowish-white lesions turn brown afterwards. Finally, a black mold layer is formed on the lesions, and the leaves gradually break and dry. Second, the onset of pathogenic bacteria (conidia) flies with the wind to the flowering Jiansui, then germinate as the hyphae invade the wheat within the winter. After sowing in the second year, the germs invade the young buds when the seeds germinate. As the wheat grows, the germs continue to spread and invade the new leaves. After sowing, the soil temperature is low, the humidity is high, the seeds germinate slowly, the seedlings are excavated late, the growth and development are poor, and the pathogens are easy to invade. Third, prevention and control methods 1, agricultural control and application of base fertilizer (organic fertilizer), help to improve soil temperature, promote seed germination and seedling growth; drainage ditch, reduce soil moisture, increase soil temperature, promote wheat seedlings early. 2. Chemical control Seed treatment is an important measure to prevent and cure this disease. It can be soaked in carbendazim. Each 50 kg of water is added with 50% carbendazim WP 100-150 g, 30 kg of soaking, and then removed and dried after 24 hours. sowing. Or use 1% lime water to soak seed, that is, in the day after the use of 50 kg lime water seed 30 kg, after 24 hours, remove and dry, storage. It can also be soaked with saponin (ferrous sulfate), 2.5 kg of saponin per 50 kg of water, 30 kg of soaking, and soaking for 6 hours. The liquid can be continuously immersed 4-5 times. Field control should be sprayed with 65% zeocin zinc wettable powder 500 times, or 50% carbendazim wettable powder 1000 times in the early stage of disease.
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