In the autumn season, the precipitation in the northern region is scarce, the autumn drought is followed by the winter drought, the temperature is high and the climate is dry, and the wheat virus disease is attacked. Such climatic conditions are very beneficial to the transmission of poisonous insects and other activities such as wheat stubble, gray planthopper, spider mites, and long-legged red spiders. As a result, many wheat fields, especially dryland wheat fields, have begun to produce virus diseases such as yellow dwarf and clump. Timely pesticide control is the key, and China Pesticide Network Xiaobian gives you advice to prevent and control wheat virus disease:
Symptoms: 1. Dwarf disease, the vector is gray planthopper, the dwarf tiller is increased, the leaf width is short, the leaf quality is rough, there is slight twisting, and the late heading is less, the neck is narrowed in the leaf sheath, firm Poor; 2, leaf blight: the transmission medium gray planthopper, the diseased plant dwarf is not obvious, the tiller is reduced, the heart leaf elongation does not develop, the leaves appear yellow-white marking along the veins, the wheat seedlings yellow-green seems to be lack of potassium, the severe disease can not Heading or poor fruiting; 3, yellow dwarf disease: spread by wheat bran, diseased at jointing stage, prevalence of booting to heading stage, dwarfing of diseased plants, yellow leaves, hard and thick leaf, generally capable of heading, but the grain is thin.
The pesticide network Xiaobian introduces you to the prevention and control measures, as follows:
1. Agricultural control. Increase the application of phosphorus and potassium fertilizer, supplement the application of top dressing, timely watering in case of drought, timely ploughing and breaking the knot after irrigation in the water, and do a good job of drought prevention, drought prevention and antifreeze work, which can alleviate the disease.
2, pest control. For wheat bran, use 40% dimethoate emulsifiable concentrate 1000 times solution, or 50% phoxim emulsifiable concentrate 1500-2000 times solution, or 805 dichlorvos emulsifiable concentrate 2000-3000 times solution spray; control red spider, gray planthopper, leafhopper, etc. 50 % A 1605 based emulsifiable concentrate 1500-2000 times solution, or 45% malathion emulsifiable concentrate 1000 times solution, or 25% imipenem emulsifiable concentrate 800 times solution spray. Pay attention to the prevention and control of the poisonous insects concentrated on the host weeds in the adjacent wheat fields and the wheat seedlings on the fields.
3, anti-toxic agents: pesticide manufacturers recommend that in the early stage of the disease, respectively, with anti-disease, or virus A wettable 800 times liquid spray, can basically control the disease epidemic.
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