76 



DISEASES OF ECONOMIC PLANTS 



ment of fruit, injury to sale of fruit, injury to keeping 

 quality of fruit. 



Snow, Spitzenburg, Maiden Blush, Greening, and Twenty 

 Ounce are more susceptible than Baldwin, while Golden 



Russet and Hubbards- 

 ton are among the 

 most resistant vari- 

 eties. 



The spray recom- 

 mended on page 100 

 will to a very large 

 extent prevent the 

 apple scab. It is es- 

 pecially important to 

 apply the mixture at 

 just the dates indi- 

 cated, i.e. just before 

 the blossoms open, 

 again just after the 

 petals fall, followed 

 by one or two more sprayings later. 



Blotch {Phyllosticta solitaria Ell. & Ev.). — In some 

 sections of this countrj^ this disease of bark, leaf, and fruit 

 is even more troublesome than any of the preceding, though 

 its distinct identity was not recognized until 1897, when 

 the first specimens came from Maryland and Texas. 

 Since then the disease has been frequently seen in the 

 eastern part of the United States though not as a very 

 serious pest. Its most destructive center heretofore has 

 been in the Ozarks of Arkansas and Missouri, where 75 per 

 cent of the crop is commonly rendered unfit for barrel- 



FlG. 26. — Apple blotch (phyllostictose). 

 Scott and Rorer. 



After 



