(i) Greenish-grey spots are seen on the tips and edges of the leaves. The spots are round or uneven in shape.
(ii) The spots are large, light brown in color and eventually turn reddish black or blackish brown.
(iii) Rotting occurs with dark wet spots on the leaves.
(iv) A velvety coating is formed on the affected area.
(v) Root mycelium and conidiophores are seen on the underside of leaves.
(vi) Spots spread to petioles or petioles.
(vii) Diseased leaves become scorched.
(viii) Dry rot in tubers.