The harm of plant viruses to the host is known as "plant cancer," and it is very difficult to control. After the virus infects the host, it not only competes with the host for the nutrients necessary for growth, but also destroys the nutrient transport of the plant, changes some metabolic balance of the host plant, inhibits the photosynthesis of the plant, and causes the plant to grow in a difficult and malformed state. Symptoms such as yellowing, severely caused the death of host plants.

Tomato virus disease is an important disease of tomato, and its distribution in north and south is more common. It occurs in all parts of the country. There are three types of mosaic disease, streak disease and fern leaf disease. Mosaic disease is most common. In recent years, the damage caused by streak disease has become more serious in some areas, and there is almost no yield after the onset of plants, which has a great impact on tomatoes. The incidence of fern leaf disease is generally lower than mosaic disease and higher than streak disease, but its damage is greater than mosaic disease.

Tomato virus disease is caused by a variety of viruses. The major viruses are tobacco mosaic virus (TMV) and cucumber mosaic virus (CMV). The occurrence of viral diseases is closely related to climatic conditions, and high temperature and drought are prone to occur and prevail. Tomato previral disease is lighter and is mainly caused by the disease and the tobacco mosaic virus carried in the seeds. It is transmitted through agricultural operations such as transplantation and colonization.

In May, when the temperature reached 20°C, fern leaf and mosaic disease began to increase, which was related to the increase of cucumber mosaic virus at this time. Perennial weeds are the overwintering hosts of CMV around the shed, and the locusts are the main mediators of CMV transmission. Where there are many weeds in the sheds, the worms in the shed are heavier and the virus disease can also increase.

The prevention and control of tomato virus disease should be mainly prevention, supplemented by treatment, and comprehensive management. On the one hand, strengthen management on planting. The measures are as follows:

1 selection of disease-resistant varieties. 2 Strengthen the cultivation and management, make a reasonable rotation, remove the diseased plants after harvest, and pay attention to the disinfection of hands and tools in field operations. 3 Seed disinfection, soaking in fresh water for 4 hours, removing and washing in 10% trisodium phosphate solution, immersing for 20 minutes, washing and germination. On the other hand, after the onset of the chemical prevention and treatment in a timely manner: 1 application of virus inactivators: such as mycotoxin A; 2 cut off the transmission route: imidacloprid or chlorpyrifos; 3 supplementary crop nutrients, accelerated growth: foliar spray brassin lactone such as Shuofeng 481, Yunda 120 and so on. At the same time, excessive temperature in the booth should be avoided. In the case of high temperatures over three days, measures should be taken to reduce the temperature, such as covering the shade net, spraying mud water or straw foam on the roof, and the insect net should pay special attention to the control of the shed. temperature.

Recently, due to the long period of high temperature in our province some time ago, virus diseases in various parts of the province were severe, mainly clustered virus of tomatoes. There were almost every shed in Shacheng, Liaocheng City. Many of the sheds were infected when they were planted. The temperature was not high at that time. , There is no large area onset, and the recent rapid increase in temperature has caused a large area of ​​morbidity, with a high incidence of more than 90%. Common virus inactivators (such as morphine hydrochloride) have no obvious effect and cannot be controlled. Therapeutic effect: A new type of antiviral biological agent developed by Prof. Wu Yuanhua of the Institute of Plant Virology, Shenyang Agricultural University, which is a novel bio-pesticide, is a new type of anti-viral biopharmaceutical. The effect is good, one or two times can control, and four to five times can effectively treat viral diseases.

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