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Chocolate Spot

Chocolate spot is a fungal disease that affects broad beans and a wide range of other plants and is seen as dark chocolate-coloured spots on all parts of the plant.

It is caused by either of two fungi;

Botrytis fabae is the most common, and only affects broad beans.

The disease is generally seen in mid-spring on early spring-sown broad beans however,the disease does not affect runner and French beans.

Botrytis cinerea causes similar symptoms, and may also cause grey mould to form on a wide range of plants.

Once established the fungus produces air-borne spores, particularly under wet conditions, and it these spores that spread the diseas

Small round, red-brown spots appear on all parts of the plant, and in severe cases leaves shrivel and plants can collapse.

Under dry conditions the spots are usually much smaller.

Control:

Non-chemical:

Avoid cool, damp, overcrowded conditions, and ensure that there is good ventilation in the vicinity of the plants.

Destroy and clear away any affected plants or plant debris.

Chemical control:

There are products on the market based on fish oils that can protect plants, but is of little use if plants are already infected!





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