and life cycle—Botrytis leafspot
Botrytis cinerea spores land on leaf surfaces and, in the presence of moisture, germinate and
produce enzymes that kill leaf tissue and provide an entry point for the fungus. The fungus damages the
leaf by causing leaf spotting. Leaf surfaces must be wet by dew or rain for long periods (20 hours or
more) for leafspot to develop. Optimum temperature for germination of spores is 59° F; optimum temperature
for mycelial growth is between about 73° and 77° F.
produced enzymes kill leaf tissue