Tobacco etch virus disease

Tobacco etch virus disease

Symptoms occur in Shandong, Henan, Anhui, Yunnan, Guizhou, Hunan, Hubei, Shaanxi, and Northeast China. They mainly occur in adult plants, stems and leaves can be infected. In the early stage of disease, small spots appear on the leaves, white stripes or polygonal lesions form, often extending along the veins. The late lesions cover the entire leaf, causing the leaves to fall out of coke or residual veins to form crust-shaped stripes, and the branches become dark and curled. The entire blade is destroyed. After the virus was infected with the tobacco, it passed to the growing point in 1 week, and it produced a strip of dead spots in its seven. Stains can also be produced on stems.

The pathogen Tobacco etch virus is abbreviated as TEV. It is called tobacco etch virus and belongs to the potato virus Y group. The virion is linear and contains single-stranded RNA with a size of 73012-13 (nm). The passivation temperature in tobacco sap was 55°C, the dilution limit was 10000 times, and the survival time in vitro was 5 to 10 days at 20°C. In addition to invading tobacco, it can also invade Datura, Chaoyan, etc. It does not harm tomatoes, eggplant, peppers, potatoes, etc.

Transmission routes and onset conditions Field weeds and overwintering vegetables are the main sources of primary infection. After sap rubbing and aphid transmission, mainly rely on smoke maggots, peach maggots pass the poison. The number of locusts has become very serious. The temperature of 25°C is conducive to virus growth, and the incidence of TEV increases.

Prevention methods (1) Timely prevention and control of aphid-carrying worms, reduction of transmission opportunities, adjustment of transplanting period in tobacco fields, cultivation of corn, sunflowers, etc. around the tobacco fields, blocking the migration of locusts to tobacco fields. (2) In the early stage of growth, diseased plants were found to be removed in a timely manner to prevent the spread of the disease. Eradicate the wild host in the field and reduce the source of poison.

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"Antimicrobial" is a general term that refers to a group of drugs that includes antibiotics, antifungals, antiprotozoals, and antivirals.

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