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| Runner Bean rust |
This disease is not to be confused with the rust that can affect Broad beans!
Rust attacks are a result of resting spores that have remained dormant over winter in the soil and reappearing early in the growing season to cause minute infections on leaves.
The infection is caused by a fungus, and appears as off white cup-shaped pustules on the surface of the lower leaves.
Attacks are most frequent in warm, damp summers.
Later in the season these pustules turn brown and the affected leaves become yellow and shrivel up.
Severe attacks can reduce yields.
There are no fungicides are available to the amateur gardener to control this disease.
Limited control can be had by promptly removing infected leaves to limit spore production.
Avoid growing beans on that site for several years.
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