FUNGI IMPERFECTI 



339 



and other conifers, as well as those of some deciduous trees, caus- 

 ing a shrinking of the bark around the young stem, and later a 

 swelling above the injured area. The affected portions may be 

 killed, and the injury results in time in the death of the plant. 



XXXIX. SHOT-HOLE DISEASE OF PLUM AND CHERRY 

 Cylindrosporium Padi Karst 



ARTHUR, J. C. Plurh-Leaf Fungus. N. Y. Agl. Exp. Sta. Rept. 8 : 293- 



298. figs. 6-10. 1889. 

 STEWART, F. C., and EUSTACE, H. J. Shot-Hole Fungus on Cherry Fruit 



Pedicels. N. Y. Agl. Exp. Sta. Rept. 20: 146-148. 



Host relations. Many of the leaf -spot fungi occurring upon 

 certain varieties of plums, cherries, and other stone fruits are to a 



considerable extent " shot- , . "' 



hole "fungi. In such cases 

 the more or less circular 

 injured area is separated 

 by a line of cleavage from 

 the healthy tissue, the in- 

 jured tissue within this 

 area promptly contracting, 

 drying, and falling out. 

 Cylindrosporium is respon- 

 sible for the greater portion 

 of this shot-hole trouble on 

 many varieties of plums 

 and cherries in America. 

 On some varieties of the 

 domestica type, as also on 

 some cherries, the fungus 

 may be common, produc- 

 ing spots only, or with 

 inconspicuous shot-hole 

 effects. This is also true 

 of the Mahaleb cherry. 

 The Japanese plums, on 

 the other hand, show a 



FIG. 162. SHOT-HOLE DISEASE OF CHOKE 

 CHERRY 



