THE STRAWBEBKY LEAF-BLIGHT ' 107 



which have sent out germinating tubes. The winter 

 spores within their cases, as they are borne on the leaf 

 in partially closed sacs called perithecia are seen in e, 

 and at /some of these cases containing spores are repre- 

 sented more highly magnified. 



Treatment. It has been repeatedly shown that 

 this leaf-blight may be prevented by the Bordeaux mix- 

 ture. Usually spraying after the crop is gathered, espe- 

 cially when the plantation is mowed and burned over, 

 keeps the disease sufficiently in check, but additional 

 spring sprayings one when the new leaves start, and 

 another just before the blossoms open will prove of 

 much benefit. Young, non-bearing plantations should 

 be sprayed two or three times during summer. 



Literature. The strawberry leaf-blight has fre- 

 quently been discussed in the American literature of 

 plant diseases. In 1885 Professor Wm. Trelease pub- 

 lished an article concerning it in the report of the Wis- 

 consin Experiment Station for that year (pp. 47-58). 

 Professor F. L. Scribner has an elaborate account of it, 

 illustrated by a colored plate, in the report of the United 

 States Department of Agriculture for 1887 (pp. 334-341). 

 Other articles concerning it have been published by Pro- 

 fessor Arthur in the report of the New York Experi- 

 ment Station (1888, p. 351) ; by Professor Dudley, in 

 the Bulletin of the Cornell University Experiment Sta- 

 tion (XIV) ; and by Professor Garman in the Bulletin 

 of the Kentucky Experiment Station. 



