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Bean leafroll virus (BLRV)

Bean leafroll virus (BLRV) is a viral disease that causes yellowing of leaves and stems, often starting at the top of the leaf.

recognize parasitoid wasp Aphidius Ervi
Parasitoid wasp, the enemy of the pea aphid that spreads Bean leafroll virus, photo: Nikk - CC BY 2.0

Bean leafroll virus (BLRV) is a viral disease that causes yellowing of leaves and stems, often starting at the top of the leaf. The virus is spread by the pea aphid (Acyrthosiphon pisum). The aphids hibernate on alfalfa and swarm out starting in May. The nanovirus that causes Bean leafroll virus takes only 15 minutes to infect a crop. After +20 days, the first symptoms become visible on leaf or stem.
The parasitoid wasp (Aphidius ervi) is a natural enemy of the pea aphid.

Where to find

Control

Difficult to control, once yellowing begins, recovery is not possible.

Prevention

Keep aphids away. In professional horticulture, the parasitoid wasp Aphidius ervi is used to kill the spreader of Bean leafroll virus, the pea aphid.