APPLE DISEASES 



499 



DISEASE SUSCEPTIBILITY OF APPLE 

 VARIETIES I> OHIO 



A. D. Selbt 



Botanist. Ohio Agricutural Experirtient 

 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 

 by 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 



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. 



