Bui. 879, U. S. Dept. of Agriculture. 
Plate IV. 
> 
Mosaic Cucumber Leaves. 
A , Small cucumber leaf, showing extreme mottling and wrinkling characteristic of a severe mosaic attack; 
Madison, Wis., 1919. B, Cucumber leaf, showing simple mottling often seen in the earlier stages of 
mosaic attack; Big Rapids, Mich., 1915. Photographed by W. W. Gilbert. 
