At present, as wheat enters the grain filling stage, farmers should pay attention to raising roots and protecting leaves to prevent premature senility and greediness, extend the functional period of upper leaves, increase photosynthetic efficiency, and prevent natural disasters such as drought, flooding, lodging, etc.; , Direct damage to the main functional leaves and ears, with sudden, fulminant, can easily cause serious damage to wheat. Chen Xinhong, an associate researcher at the Agriculture College of Northwest Agriculture and Forestry University, reminded winter wheat growers that they can prevent and control pests and diseases from the following aspects:
When controlling the flag of the thrips or locust wheat, if there are five head fleas per panicle, use 50% anti-inflamy WP 4000 times spray. When the rate of wheat stubble reaches 20%, use 2 to 10 g of 25% thiamethoxam dispersant or 20 g of 25% pyridine WP, or 20 to 30 ml of 5% acetamiprid EC, or 10 % imidacloprid wettable powder 16-24 g watered 30-45 kg spray control.
Wheat Powdery Mildew Symptoms and Prevention and Control Wheat at the heading filling stage, powdery mildew occurs mainly on the foliage, but also on the leaf sheath, stem and even wheat ears. Leaf lesions were more on the back of the leaves than on the lower leaves. The lower leaves were heavier than the upper leaves, and the lesion ovals were white powdery moldy layers. The diseased part first appeared scattered white filamentous mildew, and gradually expanded the larger mildew spots that were combined with each other to form an oblong shape. When serious, it could be contiguous, and the mold layer was thickened to about 2 mm. In the later period, many black particles were densely produced. . The diseased leaves turn yellow early and the curl curled to death. Severe diseased plants often cannot shrink. When the disease rate of wheat disease is more than 15%, and the wheat flag leaves have spots, the use of 25% tebuconazole WP wettable powder 8-16 grams or 12.5% ​​dilute oxazole alcohol wettable powder 20-30 grams or 20% triazole Ketone wettable powder 50-75 g watered 30-45 kg prevention.
Symptoms of strip rust and prevention and control of heading rust during heading stage mainly damage the leaves, and also seriously damage leaf sheaths and stems. A chlorotic spot was formed at the beginning of the diseased leaf, and an uplifting orange yellow spot gradually formed. The lesions are oval in shape, bright yellow, and arranged in a dashed dotted line parallel to the veins. The late epidermis ruptured, emitting a bright yellow powder. When the wheat was nearly mature, a flat, dark, dark brown spot appeared in the diseased part, and the epidermis did not rupture. The wheat field with bacterial mosaic streak disease is streptomycin-based spray control. The prevention and control measures taken are to centralize the prevention and control of the spread of the epidemic. When Daejeon’s disease rate reaches 0.5% to 1%, it can be treated with general treatment, 12.5% ​​diniconazole WP can be used for 20-30 grams per mu, or 20% triadimefon EC 50-70 ml, and watered 30-45 kg. Spray control. Severe disease fields require secondary spraying.
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