Wheat snow rot leaf blight symptoms. The lesions on the leaf were larger, dark green, immersed in water, nearly round or elliptic, and mostly semicircular on the edges of the leaves. The center of the lesion is yellowish-white, often with inconspicuous rim and pink mildew layer, ie mycelium and conidia of the pathogen. When the climate is wet or the morning dew does not dry, the white, radial mycelial layer often appears on the edge of the lesion. The diseased leaves later died. On the ear, the rachis axis becomes brown and rot and forms head blight.
Causes. Pathogens use hyphae or conidia to grow overwintering and overwintering on diseased plant residues or on seeds. When the environmental conditions in the spring of the next year are appropriate, the conidiospores are transmitted by wind and rain to carry out initial infection. When germs grow on seeds, they infect them for the first time in the fall and winterize with the mycelium on the diseased plants. Conidia are produced on diseased plants and spread for reinfection. Leaf blight fungus likes low temperature, high humidity climate, temperature and humidity not only affect conidial germination, invasion and incubation period, but also have some influence on spores propagation. For example, when the temperature is above 8-10°C at night, when there is light rain, it spreads quickly, and it is prone to happen. Partial application of nitrogen fertilizer, dense plants, poor ventilation and light transmission, wheat disease incidence. Normal high-stalked late-maturing varieties were more resistant to dwarfing early maturing varieties. Varieties of winter varieties are more severe than spring varieties.
Control methods
1. Agricultural measures. Strengthen the cultivation and management, rational close planting, enough base fertilizer, top nitrogen fertilizer can not be too late.
2. Chemical control. In the period of wheat flowering to grain filling, use 25% of the enemy's strength to de-emulsify oil, use 33-40 milliliters per 666.7 square meters, add 60-70 kg of water to spray. Or use 80% carbendazim ultrafine powder, 50 grams per 666.7 square meters, add 60-70 kg of water spray. Or use 25% of the enemy's decoction oil 20ml plus 80% carbendazim ultrafine powder 25g compound, add water 60-70kg spray, and cure scab. Or with 15% triadimefon wettable powder, with 50-100 grams per 666.7 square meters, add 60-70 kg of water spray, and rust, powdery mildew. Or use 25% carbendazim WP, 200 g every 666.7 square meters, add 60-70 kg of water spray, and cure scab. Or use 70% thiophene WP, 50-75 grams per 666.7 square meters, add 60-70 kg of water spray.
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