Verticillium wilt—Verticillium dahliae
Leaves on plants infected with Verticillium wilt turn yellow, wither, and fall, beginning at the base
of canes and progressing upward. Fruiting canes may take on a bluish black cast and die during the summer
as fruits are maturing. Small groups of plants may be affected.
The fungus that causes Verticillium wilt survives in soil, building up on other host plants. Avoid planting
cane fruits in soils formerly planted to other hosts of the fungus such as tomatoes. Soil
solarization may be attempted before planting if Verticillium is known to be a problem. Some varieties may be resistant.
wilt on black raspberries