According to the picture, it is root rot caused by low temperature freeze damage or too deep sowing. At present, there is a lot of this phenomenon in wheat. The reason is that since November before the Spring Festival, there has been rain (snow) and little sunshine, insufficient light, low ground temperature, high humidity, insufficient soil oxygen, and poor resistance of some varieties, resulting in pale leaves of wheat seedlings. , tillering is slow, and when severe, the leaf tips turn white, the root hairs are few and rust-colored, resulting in damp and weak seedlings. At this period, the wheat is in the weaning stage, with few roots and insufficient nutrient supply, causing chlorosis, followed by root rot and grain dryness. Some farmers sow seeds too deeply and in too large a quantity, causing weak wheat seedlings. Not frost resistant. The amount of herbicide used in the previous crop of corn was too large, and the herbicide remained. After spraying herbicides or other pesticides and hormones around the Spring Festival, the wheat encountered low temperatures, causing yellowing and root rot. Prevention and treatment: Triacontanine + trichloroethyl cyanuric acid + tebuconazole, hexaconazole, propiconazole and other "azole" fungicides + poweride (amino acid solution) to eliminate pesticide damage, nutrition, regulation, rooting, Anti-freeze kills germs in one.

At present, the wheat is in the jointing stage and can be sprayed 2 to 3 times. As a result, 15-20 kg of urea per mu can be effectively alleviated.