Vegetable virus disease, known as "plant cancer," is mainly responsible for the young plant parts, generally resulting in a reduction of 30% to 50%, while the weight is never achieved. Its main symptoms are as follows: the leaves are narrow, shrunken, yellow-green and green leaves, plant growth retardation, plant short. Vegetable virus diseases are transmitted from poisoning or contact with viruses by insects such as whiteflies and aphids. According to a recent field survey, the number of serious viral diseases is as high as 50%. According to meteorological forecast, the average temperature in September this year was higher than the normal year-on-year, and the precipitation was less than normal. It was favorable for the occurrence of viral diseases. It is expected that the virus disease will be moderately heavy, and the peak period will be from mid-September to early October. Prevention opinion: First, the diseased plant should be promptly removed and taken out of the field for destruction, to reduce the source of the disease. Second, control whitefly and aphids to reduce the source of poisoning. The first is the use of yellow armyworm board to kill; the second is the chemical control, use 4% avicidium 2500 times or 2.5% bifenthrin 800 times or 0.3% matrine 1000 times to 1500 times spray control , The above agents alternate use. Third, chemical control. Use 1.5% of phytosanitary II No. 800-fold solution or 83-sensitizer 100-fold solution or virus A300-fold plus Green Fenway No. 1 1000-times mixed spray to prevent and treat. Stevia Rebaudioside D,which is a glycoside. Stevia Rd 95%,Pure Bulk Powder,Bulk Powder Sweetener,0 Calorie Pure Powder JINING USP INTERNATIONAL CO.,LTD. , https://www.uspintl.com