Rust of broad bean

Host: Vicia faba
Pathogen: Uromyces viciae-fabae

Distribution

Uromyces rust is one of the major disease in the East and North Africa, China, northern grain growing region of Australia and India. It can cause yield loss of up to 50 %.


Symptoms

Rust of broad bean
Leaves of broad beans showing rust caused by Uromyces viciae-fabae 

Symptoms of Uromyces rust are visible on both sides of faba bean leaves. Symptoms are in form of brown to brick colored, dusty, small rusts. The rust are often surrounded by yellow halo. On touching the rust powdery mass of uredospores stick to the touching surface.


Causal organism

The disease is caused by Uromyces viciae-fabae. This is a typical autoeceous, macrocyclic rust fungus, which completes its life cycle on single host; broad bean only. The fungus absorbs nutrients from host leaves and produces uredospores in groups (sori). Uredospores are stalked, single celled, broadly ellipsoid, olive-brown colored. Each uredospores bear 4 pores in equatorial plane. The surface is uniformly echinulate. Teleutospores are oversummuring spores.

Control measures



Content first created on 16-03-2021
last updated on 17-03-2021