They don't exactly claim that Botrytis deweyae is the cause of spring sickness.
"The cause(s) of this disease remain obscure. "
"Based on this data, we infer that this new species, described here as B. deweyae, is likely to be an important contributor to the development of 'spring sickness' symptoms. "
"The emergence of this disease is suggested to have been triggered by breeding-related changes in cultivated hybrids, particularly the erosion of genetic diversity."
I did appreciate the link, it shows they are making progress and have not given up on looking for the exact cause(s).
Edited:
Sorry, crossed posted with sooby.
