Symptoms and control measures of the latest wheat take-all disease

Wheat total erosive disease is a quarantine disease infected by fungi on wheat, which is seriously harmful and spreads fast. the general bacteria can survive in the soil for more than 7 years, affected by the environment, varieties and other factors. the degree and scope of the disease also increased in varying degrees, which could reduce the yield of wheat by 20% to 35%, and the yield of seriously diseased fields by nearly half or even no harvest. It is called the "cancer" of wheat.

1. Characteristics of the disease

It takes only about 2-3 years from sporadic occurrence to piece-by-piece death in wheat field, and the symptom of total erosion disease is obvious in the filling stage to milk stage of wheat.

2. Symptoms

The plant is short, withered, white ear and black foot, so it is also called "three black"-black root, black foot, black plaster.

3. The regularity of the disease

Total erosion disease is a kind of soil resident bacteria, and seed-carrying and mechanical operation are the main ways to cause long-distance transmission. The optimal temperature of the disease was 15 ℃ ~ 24 ℃.

4. Prevention and control methods

(1) rotation and reverse cropping. The pathogen of total erosion of wheat survives for a long time in the soil, so it is difficult for wheat farmers to do so, and the effect is not good.

(2) seed treatment. Therefore, bacteria are also spread through seeds, so seed dressing has a higher killing effect on germs on the surface of seeds and in the surrounding soil after seed sowing. Through many years' experiments, silothiazone has good killing effect on wheat total erosion pathogen, so wheat total erosion clean seed dressing with silothiazone as raw material is the first choice for wheat farmers. Every 100g wheat seeds were treated with 15~20Kg, and then sowed after drying.

(3) foliar spraying. For the land with serious disease in the whole city, in addition to seed dressing treatment, wheat total erosion net (leaf spray type) was sprayed 2 times 3 times during wheat turning green to filling stage, and the control effect was about 85% and 90%. Every 20 ~ 25g wheat total erosion net (leaf spray type) with water 15Kg, uniform spray. The specific time of spraying is as follows:

① wheat return to green stage spray total erosion net

② wheat was sprayed at jointing stage.

③ wheat was sprayed with total erosion net at filling stage.

4. Key points of prevention and treatment of total erosion disease.

(1) the prevention and control rate of single seed dressing is 60% to 70%.

(2) the prevention and control rate of seed dressing + spraying is more than 85% and 90%.