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Chocolate Spot

Severe attack of chocolate spot, close up of leaf symptoms & severe disease pressure

Pathogen

Fungus

Hosts

Field and broad beans

Symptoms

Red / chocolate brown leaf and pod spots, streaky stem lesions and stained seed. These symptoms coalesce during the aggressive phase of the disease and cause flower or pod rotting, defoliation and early senescence.

Development

Plants can be infected by old bean crop debris, volunteer beans, seed, soil-borne sclerotia or air-borne spores.

Favourable Factors

Wet, humid weather, thick winter crops, poor drainage and frost damage.

Importance

The most widespread and serious disease of field beans, particularly in winter crops. Can lead to yield reductions of up to 25 % and under severe disease pressure can cause complete defoliation of the crop and possibly even complete crop failure.

Control

Identification and Management of pea and bean diseases

Find out more information on the key disease threats to your pea and bean crop. For each disease you will find out the importance of the disease in terms of potential yield penalty, how to identify the disease in its early stages and our advice on the best control strategies.

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