LEAF-RUSTS 



291 



Fig. 45. Double-blossom, a disease of the blackberry. 



economic importance, Burrill states that it sometimes does con- 

 siderable damage to raspberries. It is one of the powdery 

 mildews, and if abundant may be treated with fungicides. 



DOUBLE-BLOSSOM (Fig. 45) 



Fusarium (?) RuU (Wint.) Sacc. 



Saccardo, Syll. Fung. 10: 220. Fusisporium Rubi, Winter, Hedw. 24: 258 

 Seymour, Rep. Minn. Hort. Soc. 14: 220. Ellis and Everhart, N. A. F 

 1645. Seymour and Earle, Econ. Fung. 25. 



Order Hymenomyceteae : Family Tubercularieae. 



On blossoms of cultivated blackberry. 



This fungus was first worked out by F. S. Earle, from Cobden, 



