When the flowering stage of wheat is reduced to, how to control wheat scab

At present, for wheat that is about to enter the heading and flowering stage, the most critical task is to control wheat scab. Wheat scab not only affects the yield but also causes wheat grain spoilage. The toxin secreted by scab bacteria can also poison people and animals. in general years, the yield of wheat can be reduced by 1-20%. In pandemic years, the yield of wheat can be reduced by 5-60%, or even no harvest.

Wheat scab

Scab mainly harmed the spike of wheat, seedling rot was caused by wheat infection at seedling stage, and stem rot and spike rot were caused by infection in the middle and later stage, among which spike rot was the most harmful. In general, infection occurs in the flowering stage, symptoms appear in the filling stage, and disasters occur in the mature stage. At the initial stage of scab infection, waterlogged brown spots appeared on the spikelets and glumes, then the whole spikelet was infected, the diseased spikelet immediately withered and yellow, and a pink glial mold layer appeared at the base of the wheat spike in the later stage of the disease.

Wheat scab is caused by a variety of Fusarium oxysporum. Scab overwintered through summer and winter in the state of mycelium on the remains of crops such as wheat or corn straw, and formed ascospores in the spring of the following year, which spread to wheat ears by airflow and invaded spikelets from the withered anthers of wheat. the difficulty of pathogen invasion was very different in different growth stages of wheat, and the disease was the most susceptible at flowering stage, followed by heading stage. Under the condition that there are a large number of bacterial sources of scab, if the wheat during heading and flowering meets more than 3 days of continuous rain and the temperature is kept above 15 ℃, scab will be prevalent.

The key to the control of wheat scab is to do a good job of spraying at the flowering stage of heading poplar. First, a good grasp of the period of prevention and control of scab, if the heading period encountered continuous rainy days, spray prevention time would rather be early than late, 10% of wheat per mu is in the early stage of heading to flowering, the first spray, the interval of 5-7 days, the second time. The second is to select appropriate control agents. Wheat was sprayed with 100 grams of 50% carbendazim wettable powder or 50-75 grams of 70% methyl topiramate wettable powder with 50 kilograms of water or 50 grams of dilute azolol solution with 30 kilograms of water per mu. Third, the method of medication should be mastered well, and the spraying process should focus on the uniform spraying of wheat panicles. If it rains after spraying, it needs to be sprayed after rain.