Serological detection: the virus has good immunogenicity. Lettuce mosaic virus is serologically related to potato Y virus: soybean mosaic virus, maize dwarf mosaic virus, sugarcane mosaic virus, turnip mosaic virus and other potato Y viruses are not serologically related, including Bidens bipinnata mottle virus, iris mosaic virus, European parsnip mosaic virus and common bean mosaic virus. Quarantine risk assessment: the pathogen of the disease, lettuce mosaic virus, can be transmitted through seeds such as lettuce and aphids. There is no report of serious economic loss in bean production, and it is easy to take root and colonize under good living conditions. At the time of risk assessment in Ji Liang, the risk value was 8, and it was classified as an imported quarantine pest with medium risk. However, since beans have not spread, there is no need to quarantine them. However, because it has occurred in China, it can seriously harm lettuce, and prevention and control should be strengthened.