Bui. 957, U. S. Dept. of Agriculture. 



Plate VI. 



Leaves OF Rises 1 NFECTED WITH Cronartium ribicola. Showing Different 



Types of Infection. 



Fig. l.—Infocl Oil leaves of Ribcs glandulnsuin, showiii" lower surfaces; the sparsely scattered telia 

 are well distributed over the entire surface. Etiolation caused by the disease is also evident. 

 X 8- Fit;. '■^- — Lower surfaces of leaves of A'iftr.v sp., showing etiolaied spots where infection has 

 taken place, two days before uredinia were formed. X J. Fit;. ;i.— Lower surfaces of infected 

 leaves of Kiocs aurcum, showing the disease distributed in local siiots most ly well sejiarated from 

 one another. On the right side of the right leaf a large area of leaf tissue has died. Ktiolation 

 from the disease is evident, x S. 



