How to prevent and control wheat scab?

Wheat scab, also known as red-headed miasma and rotten wheat head, actually occurs in wheat areas all over the country, and is more serious in the spring wheat areas in the middle and lower reaches of the Yangtze River and Northeast China. This disease will not only affect wheat yields, but also cause corruption and deterioration of wheat grains. What is more serious is that the toxins secreted by this bacteria can poison people and livestock.

Scab mainly damages the ears of wheat, and will be infected at all stages of wheat growth. In the early stage of scab infecting wheat, water spots will appear on the spikelets and glumes. Stain-like brown spots will then gradually expand to the entire spikelet, and the spikelet will gradually wither and turn yellow. In the later stages of the disease, a pink gelatinous mold layer will appear at the base of the spikelet.

In fact, wheat scab is caused by infection by a variety of Fusarium fungi, and scab fungi have strong pathogenicity and are widely distributed. Wheat has different difficulty in invading pathogens at different growth stages. It is most susceptible to diseases during the flowering stage. Also, under conditions where there are a large number of bacterial sources, if the wheat is in the period of heading and flowering, it will be infected for 3 days. In the above continuous rainy weather and the temperature is above 15℃, scab will become widespread.

The key to the prevention and control of wheat scab is to prevent spraying during the heading poplar flowering period, and to master the method of spraying. When spraying, focus on evenly spraying the wheat ears. If If it rains after spraying, additional spraying after the rain is required. We are also choosing disease-resistant and tolerant varieties and sowing seeds as early as possible to avoid rainy weather during the flowering period. Reasonable fertilization, increased fertilization, and a combination of nitrogen and phosphorus. Drainage should be done promptly after raining to reduce the humidity in the field. Also, before sowing wheat, crop residues are removed from the field to reduce the source of bacteria.

You can also soak the seeds with 0.2% of the seed weight and 50% carbendazim wettable powder for 30 minutes, and then dry them before sowing. The best time to apply pesticide is during the flowering period. It should be applied when the flowering time is 10 to 50. You can choose 50 carbendazim wettable powder 800 times liquid, or 70 thiophanate-methyl wettable powder 1000 times. liquid.