Ascochyta blight, black spot

Ascochyta blight, sometimes called black spot, causes a purplish-black discolouration and streaking of the lower stem. Severe stem infections may also cause stem or foot-rot which kills the plant.

Conspicuous spotting of the leaves and pods also occurs. The leaf spots may be either small, irregular, dark-brown and scattered over the leaf, or a few large, circular brown spots. Spots on the pods may coalesce to form large, sunken, purplish-black areas.

Infected seeds may be discoloured and appear purplish-brown. Discolouration is usually more pronounced on those areas of the seed coat next to diseased areas on the surface of the pod. Lightly infected seed may appear healthy.

Plant Protection Products