Angular Leaf Spot of Beans

Phaeoisariopsis griseola


A fungus causing angular spots, about 10 mm diameter on the main leaves and smaller 2-3 mm diameter spots on the trifoliate leaves. Spots are bound by veins, which gives the angular appearance. Small, black, bristle like fruiting bodies may occur on the underside of the spots. Dark sunken spots may appear on the pods and infect the seed.

Species Affected:

Beans, French Beans.


Seed can be infected or passively carry the fungus from contact with plant residues during harvest.
Favoured by cool showery weather.

Life Cycle:

Origin and History:



Management and Control:

Plant resistant varieties such as Redlands Greenleaf.
Destroy plant debris soon after harvest.
Apply fungicides.

Related and Similar Species:


(McMaugh, 1985)


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