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Broad bean rust is one of the most common fungal diseases of broad bean leaves. The fungus causes small, dusty, dark brown spots surrounded by a pale yellow halo on leaves and stems.
Common name Broad bean rustScientific name Uromyces viciae-fabaePlants affected Broad beansMain symptoms Small, dusty, dark brown spots on leaves and stemsCaused by FungusTiming Mid-summer
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:
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 carries out its entire life cycle on one host, which, in the UK, is the broad bean. Unlike chocolate spot, the infected leaf tissues remain alive, providing nutrients for the fungus while it produces dusty brown airborne dispersal spores. A semi-dormant resting spore carries it over the winter.
Another fungal pathogen, Didymella fabae (syn. Ascochyta fabae), causes spots on leaves and pods, but is usually less damaging than broad bean rust.
BlackflyBroad bean chocolate spotBroad bean seed beetleBroad beans: growingDisposing of diseased materialGrey mouldGrow Your OwnPea and bean weevilsRunner and French bean rust
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