Halo blight on French Beans

Halo blight image

Question ...

The first row of my French beans is badly infected with something. What is it, and what can I do about it?

Answer ...

Your leaves show classic halo blight symptoms. This is a bacterial disease, transmitted through the seed. Remove and destroy badly infected plants, and never save seed from a plant with similar symptoms. Pick individual leaves off if the whole plant is not affected. Avoid overhead watering as the spores are spread by water drops. Unfortunately Halo Blight can be retained in the soil, so be sure to use a 3 year minimum rotation before planting beans in the same patch. Observe good hygiene by cleaning tools and boots.

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