The typical hosts for this virus are apiaceous plants, which is known as the carrot family.

The virus is transmitted by the willow carrot aphid, Cavariella aegopodii.

[3] Carrots that survive overwinter are the source of inoculum for the first flush of spring aphids.

[5] Washington and Wisconsin are the nation's largest producers of carrots used for processing.

[6] The aphid is wide spread across the United States and its primary host are willow species.