APPLE DISEASES 
DISEASE SUSCEPTIBILITY OF APPLE 
VARIETIES IN OHIO 
A. D. SELBY 
Ohio Agricutural Expervment 
Station, Wooster, Ohio 
The tabular matter prepared under this 
heading is designed to answer many of 
the usual questions with regard to sus- 
ceptibility or disease resistance of this 
or the other apple variety under Ohio 
conditions. It was originally suggested 
py Prof. W. J. Green, horticulturist of 
the Ohio Agricultural Experiment Station, 
who has assisted freely in its preparation. 
J. B. Keil, assistant horticulturist, has 
also contributed freely with his expe- 
rience in the orchard I am under similar 
obligations to Prof. Wendell Paddock, 
professor of horticulture, Ohio State Uni- 
versity, Columbus, and to numerous 
Botanist, 
499 
growers for extracts from their note- 
books. 
The plan of the table is to specify in 
each column opposite the name of the 
variety, the observed susceptibility or re- 
sistance to the disease named in the 
column. The general behavior of the 
varieties included has been under observ- 
ation for a varying number of years, 
according to the newness of the variety, 
and while it is to be presumed that vari- 
ation in behavior with respect to disease 
susceptibility actually occurs, the forms 
of statement used in the table are de- 
signed to include this variation where 
known. 
The usefulness of the table will be best 
realized by rejecting the varieties show- 
ing serious weaknesses or susceptibilities 
and endeavoring to group those having 
the maximum number of good grades 
with respect to disease susceptibility. 
