Tobacco leaf diseases mainly include mosaic disease, horn spots, wildfire disease, and temperate spot disease. The insect pest is mainly tobacco budworm. Timely pesticide control is critical. China Pesticide Network Xiaobian organizes relevant disease information for your reference:
First, mosaic disease. First, pay attention to field operations and tool disinfection, timely remove diseased plants and concentrate on destruction. The second is balanced nutrition, improve nutritional resistance, reasonable ratio of nitrogen, phosphorus and potassium fertilizer, and increase the amount of potassium fertilizer. The third is to reunify and eliminate phlegm and cure phlegm after the wheat harvest, and cut off the path of virus transmission. The fourth is to use the virus Becker wettable powder 500 times solution, Jinyebao wettable powder 400 ~ 600 times liquid or 0.1% zinc sulfate, 20% virus A spray control.
Second, corner spots, wildfire disease. First, the tobacco field is rationally fertilized and watered to prevent excessive nitrogen fertilizer and increase phosphorus and potassium fertilizer. The second is to remove the diseased leaves in time when the field spots occur, and spray 1:1:150 Bordeaux mixture or 2 million units of agricultural streptomycin or 50% DT500 times solution, spray once every 7-10 days, continuous 3 or more times.
Third, climate spot disease. First, strengthen field management, increase root dressing, increase the resistance of tobacco leaves; control the transplanting density, remove the foot leaves in time, and enhance ventilation and light transmission. The second is to use 70% of the fungicide methyl thiophanate 500-1000 times solution, 50% sensitized zinc 600 times solution or 2 million units of agricultural streptomycin 500 times solution spray.
Fourth, tobacco budworms. First, adhere to the principle of “governing the disease and treating the disease†and eliminate the pests before the 3rd instar (overeating period). The second is to kill larvae and eggs, check the bottom leaves and leaf backs, spray and kill eggs when purple-brown eggs are found, check the heart leaves and young leaves in time, and carry out artificial killing; the third is to kill 1000-1500 times with the enemy. 900% trichlorfon, 50% chlorpyrifos EC 1000 times, 50% phoxim emulsifiable concentrate 800 times, 90% Wanling or fast WP 3,000-5000 times, 50% Fuling emulsifiable concentrate 1000~2500 times The effect is ideal. Alternate medication should be used to prevent pests from developing resistance.
The pesticide network reminds everyone that the prevention and control of tobacco pests and diseases should not only be started early, but also must be scientifically controlled. The development of pests and diseases and the problems in prevention and control should be promptly reflected or consulted to the tobacco department in order to take targeted measures to prevent large-scale occurrence of pests and diseases.
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