Wheat rust is an airborne disease, including leaf rust, strip rust and stem rust, which are important diseases that endanger wheat. Spores of rust can spread with the wind, and can spread up to hundreds of kilometers or even thousands of kilometers. After the rust spores infest the wheat, the spore heap quickly penetrates the green tissues such as wheat leaves and stems, causing a large amount of wheat body fluids to evaporate and lose, resulting in a reduction in yield. The light yield is reduced by about 30%, and the heavy ones are reduced by 50% to 60%.
Wheat stripe rust mainly occurs on the leaves, and also damages leaf sheaths, stems, wheat ears, husks and wheat awns. Leaf rust mainly occurs on the leaves and also damages the leaf sheath. Stem rust mainly occurs on stems and sheaths. Rainy and humid, with more precipitation, is an important condition for inducing wheat rust. This year, the south is continuously rainy and the precipitation is increasing, which is an important condition for the outbreak of wheat rust. This year, there are more rainy days in May. Temperature and humidity are conducive to rust, and rust will pose a serious threat to wheat in our province. Therefore, the people in the wheat area of ​​our province should maintain a high degree of vigilance, make predictions and predictions of wheat disease early, early detection and early treatment, and minimize losses.
Control method
Agricultural control
Plant resistant varieties. Increase the application of phosphorus and potassium fertilizers to achieve a reasonable mix of nitrogen, phosphorus and potassium, and enhance the growth of wheat. Do not apply too much, too late, to avoid late maturity. The wheat field should be properly watered to prevent flooding and reduce the humidity in the field. Planting in the north and south, improving ventilation and light transmission.
2. Chemical control
Before sowing, 30 mg of active ingredient per 100 kg of triadimefon (powdering rust)/100 kg of seeds were used for seed dressing. In the early stage of the disease, 15% triazolone wettable powder 1000 times solution, or 25% propiconazole 1500 times solution, or 12.5% ​​diniconazole 2000 times solution was sprayed. When spraying the spray, it must be sprayed evenly, spraying 30-45 kg per acre. After spraying, check the control effect in time. If the effect is not good, spray it a second time. Use pesticides alternately to avoid drug resistance.
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