It is known that scabs can occur in every growth period of wheat, causing seedling blight, base rot, culm rot and ear rot, among which ear rot occurs most commonly and severely, followed by culm rot, seedling rot does not occur significantly. The culm rot mostly occurs in the first and second sections under the ear, and the water-stained chlorotic spots appear on the leaf sheath at the beginning of the disease, and then expand to light brown to reddish-brown irregular spots or spread to the stems. When the disease is severe, the diseases are caused. Above yellow, wheat dies at the late stage of grouting, and diseased plants are easily broken. When the climate is wet, pink mildew layer can be seen on the diseased surface.
According to Chen Huaigu, culm rot occurs every year in wheat, and the incidence is generally not severe, and the field disease rate is not high. When the rainfall at the early stage of heading of wheat is too high, pathogens flow along the leaf sheath into the 1-2 sections below the ear, causing culm rot. Fusarium oxysporum can cause culm rot symptoms before wheat heading and after heading. From the perspective of the incidence of production, more culm culms are caused by invasion before heading. This year's wheat heading and flowering seasons and rainy days are important causes of wheat culm rot.
The best time to control wheat scab is in the period of wheat heading and flowering, and the period of invasion of culms caused by culms is mostly before the wheat heading date. If the wheat meets rainy weather before heading, the prevention and treatment time should be advanced to the heading period. Heading period. Drugs can choose carbendazim, thiram, thiophanate-methyl, tebuconazole, cyanocastrobin, prochloraz and so on.
In the normal year of controlling wheat scab, grasping the best period of heading and flowering, with carbendazim, thiram, thiophanate-methyl and other agents and their formulations have a better preventive effect. In special years when wheat heading and flowering seasons are rainy and cloudy, it is best to use cyanogens, prochloraz, and other pharmaceuticals and their compounding agents for prevention and treatment, and use the medicine twice in succession to ensure effectiveness.
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