Black pycnidia of the blackleg fungus, Phoma lingam,on an infected cauliflowerseed. Note the amethyst-colored cirrhi (gelatinousmatrix) oozing from thepycnidia, which indicatesthe strain of the pathogenis virulent(able to causePhoma leaf spot or blackleg of brassicas)
Phoma leaf spot lesion with tiny, black pycnidia present in the necrotic, circular lesion, surrounded by a narrow, chlorotic (yellow) halo.
Black leg symptoms on a cabbage seedling grown from an infested seed lot. Note the small, black fruiting bodies (pycnidia) on the hypocotyl of the seedling.
Pycnidia of Phoma lingam on the base of the stem of a Brassica rapa plant, showing pink cirrhi oozing out of each pycnidium, containing thousands of conidia. The conidia are readily splash-dispersed.
