NOTES ON THE ERYSIPHACEAE 93 
mous multiplication of epidermal hairs or fuzz of the peach. Under 
the affected spots there is a hardening of the fruit and the conse- 
quent effect upon the quality is less marked though quite similar 
to that produced by the scab (Cladosorium carpophilum Thim.). 
To cut and burn affected shoots is recommended as a preventative 
measure for mildew. Spraying is unlikely to yield favorable re- 
sults.” 
Halsted (23%), in mentioning the fungus on diseases ob- 
served on fruit trees during 1894 at the New Jersey Agricultural 
Experiment Station, remarks : “S$. pannosa has interfered with 
the growth of the young twigs of peach trees, coating them over 
in much the same manner that S. mors-uvae does the stems of 
the gooseberry.” 
S. MORS-uvAE (Schwein.) Berk. & Curt. (Monograph, p. 70) 
Distrib. add: Europe, in a garden, Ballymena, County An- 
trim, Ireland (? introduced). N. America, U. S., Utah (73), In- 
diana (84). 
The appearance in 1900 of the. ‘‘ American -gooseberry-mil- 
dew,”’ S. mors-uvae, up to that time known only from the United 
States, in Ireland has already been noted (51) (71 and 72). In 
the present year (1901) the disease has reappeared in the same 
garden at Ballymena, County Antrim, and the gardener there has 
Feported to me the following facts: “The disease this year was 
€ven more extensive than last ; and the young wood seems more 
affected at this time of year (August) than it did last year. I have 
not heard of any neighboring gardens being affected as yet. Some 
Varieties of gooseberries are far more subject to the disease than 
Others. The « large green” gooseberry is not affected, while 
the “small green’ is very much affected, although both berries 
are smooth. The “amber” is by far the worst of any. Some 
varieties of “ red” seem proof against the fungus, while others are 
nearly as Susceptible as the “amber”; the ‘“ smooth red” is the 
Worst. 
: Magnus is of the opinion that the fungus has been introduced 
eRe Ireland from America, and suggests (47) that imported goose- 
Tes bearing the fungus may have been the source of infection. 
ee This, however, cannot have been the case, as the authorities at the 
