THE STRAWBERRY LEAF -BLIGHT. 



Sphaerella Fragarice. — Saccardo. 



Fig. I. — Leaf of Strawberry, marked by i^Aa«>-^//a Fragariee. 



DURING the season of 1888 the Strawberry Leaf-blight was 

 unusually abundant. This disease has long been recognized 

 as due to the attack of a parasitic fungus, believed by some to ap- 

 pear in several different but geneticall}- connected forms on the 

 host-plant, by others to be limited to one form only. Finding it 

 extremely prevalent about Ithaca in September and October, it 

 was resolved to observe its habits during the winter and succeed- 

 ing spring ; and, if possible, add something to our incomplete 

 knowledge of its life-history. The general lines of the work were 



