THE STRAWBEBRY LEAF-BLIGHT 107 



which have sent out germinating tubes. The winter 

 spores witliin 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 preyented 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 (pj). 47-58). 

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

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

 States Dej)artment 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. 



