320 MANUAL OF FRUIT DISEASES 



the rust fungus are found on hepatica, anemone and thalic- 

 trum, all common wild flowers. The trouble shows on the 

 lower surface of the leaves of stone-fruits as small, round, pow- 

 dery, yellowish brown pustules. Opposite these pustules, on 

 the upper surface, the leaf turns reddish yellow in local areas. 

 Such lesions frequently become limited and the affected tissue 

 falls away, leaving a shot-hole effect in the leaf. These spots 

 and holes may be confused with those caused by the California 

 peach-blight fungus (Coryneum Beijerinckii Oud.), but are 

 distinguished from the latter by their smaller size. Peach 

 rust has a rather general geographical range, but does not 

 ordinarily do damage sufficient to warrant treatment. See 

 also Plum, page 377, and Apricot, page 156. 



SILVER-LEAF 

 Caused by Stereum purpureum Fries 



While this disease affects primarily the plum and apple, 

 many other fruit-trees and shrubs are liable to it. The peach 

 is sometimes victim to silver-leaf, but it never suffers so gen- 

 erally and so extensively as others of the stone-fruits like the 

 plum. The characteristics, cause and other features are dis- 

 cussed under Plum, page 368. 



REFERENCES 



Anonymous. Silver-leaf in peaches. Gard. Chron. 3 : 30 : 220 ; 247- 



248. 1901. 

 (See additional literature listed under Plum, page 373.) 



FROSTY-MILDEW 

 Caused by Cercosporella Persicoe Sacc. 



In the central Atlantic states there occurs a peculiar disease 

 of peach-leaves. It is more common from Maryland south- 



