Combination for preventing and treating plant virosis and application thereof

The invention provides a combination for preventing and treating plant virosis. The combination is composed of two components (A and B) with the weight ratio of 1-6: 2-9, wherein the component A is giant knotweed extracting solution, and the component B is a plant source surface active agent. The component B is composed of the following raw materials (the weight percent of each raw material is shown in brackets): plant protein amino acid solution (10 to 40%), saponin extracting solution (20 to 50%), and the rest is tea saponin (100% in total). The components of the combination for preventing and treating the plant virosis are derived from plants, can be degraded in nature, cannot pollute the environment and agricultural products, are difficult to accumulate toxicity in the environment andin human bodies, are relatively safe to the human bodies and domestic animals, have the characteristics of mild toxicity and less residuals, and can keep high quality of the agricultural products. With high activity, obvious effect and convenient using, the combination in the invention can effectively prevent and treat diversified plant viruses.