Evaluation location: Idaho, United States
Pea Enation Mosaic Virus differential (PEMV)
The Pea enation mosaic virus. At least 8 species of aphid can transmit the virus but the principal vector is the pea aphid, Acyrthosiphon pisum. After the aphid acquires the virus, it is 8 or more hours before it can transmit it to a pea plant, but the aphid retains the ability to transmit the virus for at least 24 hours, during which time it can fly or be blown long distances.
Plant hosts include chickpea, lentil, faba bean, broadbean, sweet pea, certain species of lupine; Hungarian, common, and hairy vetch; and several species of clover including Alsike, white, crimson, and subterranean. Weedy subterranean clover is the principal overwintering host in western Oregon. Alfalfa is not a host. This virus can be detected in seed but is not transmitted by seed.
Symptoms Mottling, crinkling, and stunting followed by tissue outgrowths on leaves and pods. Pods may be badly distorted.