A gray-green spore mass may sometimes be seen. Numerous, irregular, small, brown watersoaked spots occur on leaves, followed by premature defoliation. Spots gradually turn black with dried sections of leaf tissue disintegrating and falling from leaves. Racemes are attacked under humid conditions. Serious losses may occur under humid conditions.
Leaves dry up, turn black and fall.
Branches also turn black, and stems may be affected, in which case the plants usually die. The entire group of flowers is attacked and converted to a prominent wooly mass of fungal growth. Also affects leaves and stems by infection from racemes. First symptoms are small, blackish spots from which drops of yellow may exude. Fungal threads which grow from these spots spread the infection and produce the characteristic wooly appearance of the inflorescence.