What vector is mainly responsible for spreading bean common mosaic potyvirus?

The primary vector responsible for spreading bean common mosaic potyvirus is aphids. This is due to the nature of how aphids feed and their ability to transmit the virus while feeding on the sap of infected plants. Aphids can acquire the virus from an infected plant and then transmit it to healthy plants during their feeding activity. This transmission can occur rapidly, causing disease outbreaks in crops.

Additionally, the life cycle and behavior of aphids allow them to spread the virus effectively over large areas, contributing to the widespread distribution of this pathogen in bean crops. Other potential vectors such as leafhoppers, fleas, and beetles either do not have the same efficiency in transmitting this specific virus or do not play a significant role in its epidemiology. This makes aphids the main concern for growers dealing with bean common mosaic potyvirus.