Can you tell me why black to dark brown fungal growth has appeared on my French Beans and Runner Beans?
Posted by Dobies Staff on 24 June 2013 11:34 am
This fungal disease is rust and it is becoming more frequent in Britain, attacking both Runner and French Beans especially in warm, damp summers. 

Black to dark brown pustules develop on the leaves, stems and pods.  Occasionally white cluster cups can form on the underside of the leaf.  In severe attacks the leaves wither and cropping is reduced. 

To help reduce the risk of spreading the disease affected parts of the plants should be removed and destroyed as soon as they are seen.  Unfortunately there are no chemical controls available.
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