What are the prevention and control methods of wheat scab?

What harm does wheat scab have? What are the prevention and control methods of wheat scab? Is there a netizen who knows well to help introduce it? The planting network has sorted out the harm and control methods of wheat scab, which are listed in detail below for reference by the majority of netizens. The harm of wheat scab: wheat scab is commonly known as "rotten wheat". Scab can cause diseases such as wheat seedling blight, stem rot and ear rot. Once wheat scab is prevalent, the ear rate of wheat will often reach more than 50%. Not only the yield is greatly reduced, the quality is deteriorated, and the diseased grains also contain toxins, which can cause poisoning symptoms in humans and animals after eating. Scab can occur from wheat seedlings to heading, causing seedling blight, stem rot and ear rot, especially panicle rot. The spike rot of wheat begins after flowering, which shows that the spikelet and glume turn gray and white at first, the spikelet seam and the base of spikelet appear pink mildew layer at first, then the needle is big blue and black grain, and then the diseased spike grain is withered. The high incidence period of wheat scab is when the temperature is between 25 and 30 ℃ and the humidity is about 80%. If the temperature rises quickly in early spring, Rain Water is sufficient, the ascomycetes in rice piles form early and more, and the number of bacteria sources is large, coupled with the continuous overcast and rainy weather at the heading and flowering stage of wheat, under the condition that the bacteria source, weather and host growth period coincide, the disease (ear rot) will be widespread. The prevention methods of wheat scab are as follows: first, eliminate the overwintering bacteria to remove the disease residues such as rice and wheat stumps and corn stalks in the field, and disinfect the seeds before sowing combined with the prevention and control of smut. Method 2. Sumai 2, 3, Xiangmai 1, Xinnong 8881, Xinbaofeng, Wanmai 27, Zhengyin 1, Hongmang 22, Yuemai 6, Wannian 2, Ning 8026 and 8017 were selected for disease resistance (tolerance). Local areas can be introduced and planted according to local conditions. Method 3. Strengthen cultivation management and adjust sowing date according to local conditions; apply fertilizer with formula, increase phosphorus and potassium, not partial application of nitrogen fertilizer; regulate drainage and irrigation system, lower groundwater level and prevent root premature senescence. Method 4. Spraying the wheat in the critical period can be prevented according to the weather, seedling condition and condition of the local wheat before and after heading. The first application should be controlled at the full heading and flowering stage, spraying 2-3 times, once every 7 days. You can choose 50% carbendazim, 70% topiramate, 45% triadimefon thiram or 40% triadimefon carbendazim 1000 × 1500 times spray. Click to get more wheat planting technology click to get more grain planting technology