Poniaceous Fruits 



43 



which it is often associated, l)ut may be distinguished 

 from it by the presence of myriads of minute pimples 

 distributed thickly over the affected region. With a hand 

 lens coils of spores may often be clearly seen issuing 

 from these pustules. 



Upon the leaf, 

 blighted spots are 

 produced, irregularly 

 circular in outline, 

 often marked by 

 concentric rings. 

 The body of the 

 spot is brownish and 

 the margin sharply 

 limited. Similar 

 spots are caused in 

 several other dis- 

 eases, and definite 

 knowledge of the 

 nature of leaf spots 

 must depend upon 

 microscopic diagno- 

 sis in each special 

 case. 



The various forms 

 of this disease which 

 have been noted 

 above are found in 

 Nebraska,. Michi- 

 gan, the Ozarks, 

 Ohio, Wisconsin, and 



throughout the Allegheny and eastern apple sections, and 

 are troublesome each year. 



The treatment should be the same as that recommended 

 for bitter-rot with special care to avoid bark wounds of 

 all kinds, as from ladders and workmen's boots. 



A rot upon fruit very similar to bitter-rot, and a twig- 



FiG. 18. 



Pacific coast canker. After 

 Cordley. 



