Crop Management and Diagnosing Virus Damage in Field Peas | Original Article
Peas are susceptible to a large number of aphid- transmitted viruses, which can produce diseases individually or in combination. Many common names have been used to describe these diseases, and to avoid confusion they will be mentioned in the discussion under each virus. The main viruses infecting pea belong to three distinct virus groups designated by virologists. Pea enation mosaic is the only member of one group, pea streak and red clover vein mosaic belong to a second group, and the final group includes bean yellow mosaic (also called pea mosaic), clover yellow vein, and pea seedborne mosaic. Pea enation mosaic virus (PEMV) is one of only a few viruses with unique properties and hence has been assigned to a separate virus group. The virus mainly infects legumes in the temperate regions of the world. In addition to pea, PEMV also infects broadbean (from which the virus was first described in New York in 1935), sweet pea, and alfalfa and probably overwinters in many common perennial legumes. The virus is spread in nature most efficiently by the pea aphid (Acyrthosiphon pisum) and to a lesser extent by the green peach aphid (Myzus persicae). The virus is transmitted in a persistent (circulative) manner.