Bean Lear Roll Virus. In: Compendium of Pea Diseases and Pests

Authors: Porter, Lyndon

Submitted to: American Phytopathological Society Press
Publication Type: Book / Chapter
Publication Acceptance Date: 7/17/2020
Publication Date: N/A
Citation: N/A

Interpretive Summary: Bean leaf roll caused by Bean leaf roll virus was first reported in Germany by Boning in 1927. It is also commonly known as Pea leaf roll virus because of its importance and severity on pea. The virus is found worldwide and mostly infects plants from the family Fabaceae. The virus was first found in the U.S. on pea in Washington and Idaho in 1980. Symptoms associated with BLRV infection include chlorosis and stunting. Early infections can result in plant death. Infected leaves are chlorotic and curled. Late infections result in only new foliage at the top of the plant turning yellow, while older tissue remains green. Pods of infected plants are often misshaphen, poorly filled and yield is severely reduced. BLRV is caused by a single-stranded RNA, positive-sense luteovirus. BLRV is transmitted in a persistent, non-propagative manner by at least 12 aphid speices. The virus is not seed or pollen transmitted. Alfalfa is an excellent perennial reservoir for BLRV. Pea fields in close proximity to BLRV-infected alfalfa fields that are harvested are at high risk of infection by aphids that move from the alfalfa to peas. Neonicotinoid seed treatments have demonstrated the ability to limit primary infections by aphid vectors. Foliar insecticides may limit the spread of the virus by managing the vector. Early planting dates can allow pea plants to be more mature at infection, which can reduce the impact on yield. Known resistant genes are responsible for increased resistance or tolerance to the virus and resistant cultivars are available.

Technical Abstract: Bean leaf roll caused by Bean leaf roll virus was first reported in Germany by Boning in 1927. It is also commonly known as Pea leaf roll virus because of its importance and severity on pea. The virus is found worldwide and mostly infects plants from the family Fabaceae. The virus was first found in the U.S. on pea in Washington and Idaho in 1980. Symptoms associated with BLRV infection include chlorosis and stunting. Early infections can result in plant death. Infected leaves are chlorotic and curled. Late infections result in only new foliage at the top of the plant turning yellow, while older tissue remains green. Pods of infected plants are often misshaphen, poorly filled and yield is severely reduced. BLRV is caused by a single-stranded RNA, positive-sense luteovirus. BLRV is transmitted in a persistent, non-propagative manner by at least 12 aphid speices. The virus is not seed or pollen transmitted. Alfalfa is an excellent perennial reservoir for BLRV. Pea fields in close proximity to BLRV-infected alfalfa fields that are harvested are at high risk of infection by aphids that move from the alfalfa to peas. Neonicotinoid seed treatments have demonstrated the ability to limit primary infections by aphid vectors. Foliar insecticides may limit the spread of the virus by managing the vector. Early planting dates can allow pea plants to be more mature at infection, which can reduce the impact on yield. Known resistant genes are responsible for increased resistance or tolerance to the virus and resistant cultivars are available.