Botrytis leafspot (leaf blight)—Botrytis cinerea or other spp.
Botrytis leafspot, also called leaf blight, occurs on onions. White sunken spots on leaves are usually
signs of infection; spots are small and tend to be oval. They sometimes have a light green halo and may
appear water soaked. The epidermis around the spots may be silvery. When numerous spots are present, leaf
tips die back and whole leaves may be killed.
To reduce the level of disease inoculum in the soil, use a 3-year rotation scheme away from onions, garlic,
and related crops and destroy volunteer onions during this period.
sunken spots on leaves