PLATE 2 
The effect of soil temperature on the infection of Canberra wheat by Urocystis 
tritici: 
Containers 1-4 at i4°-i6° C. 
5-8 at i9°-2i° C. 
9-12 at 24°-26° C. 
13-16 at 29°-3i° C. 
Note destructive action of the pathogene in containers 7 and 8, in which germi¬ 
nating spores were used as inoculum. X A. 
