Angular leaf spots

Is this a Minor Pest?
Minor Pest Title

Angular leaf spot (Phaeoisariopsis griseola)

Minor Pest Description

Symptoms consist of small dark brown spots with angular edges and are often numerous to give the foliage a checker-board appearance. The spots may increase in size, join together, and cause yellowing and necrosis of the affected leaves. This may lead to premature defoliation. When humid, the fungus produces a grey mould on the lower surface of the spots. Infected pods have brown blotches. The disease is favoured by high moisture and moderate temperatures (20-25°C).

The disease is seed-borne.

Minor Pest What to do.
  • Use certified disease-free seed.
  • Plough under bean debris after harvest.
  • Practise a 2-3 year crop rotation without legumes.
  • Do not work in bean fields when the plants are wet.
Pest Type
Host Plants
Bean Leaves (New)