Broad bean rust is one of the most common fungal diseases of
broad bean leaves. The fungus causes small, dusty dark brown
spots on leaves and stems. What is broad bean rust? Broad bean
rust is caused by the fungus Uromyces viciae-fabae. It is not as
damaging as another common broad bean disease, chocolate spot,
but severe attacks can cause defoliation. Expect to see
significant levels of this rust from mid-summer. It attacks
broad beans, peas and other related legumes and has several
races, but in the UK is only important on broad beans. Runner
and French beans are affected by a more serious, but unrelated
rust disease. You may see the following symptoms: - On leaves
and stems: Small, dusty, dark brown spots appear - Maximise air
flow around the plants by wider spacing and avoid damp, humid
sites - Destroy infected plant material at the end of the season
There are no effective fungicides available to gardeners for
rust control on broad beans. Uromyces viciae-fabae is a typical
example of a rust fungus that ca