PLATE 5 
A. —Calandrinia menziesii T. & C. Normal plant. 
B. —Plant of about the same age but affected with curly-top. From plants 
diseased^ as is B, from inoculation with viruliferous insects the disease has been 
communicated to healthy beets by the use of nonviruliferous leafhoppers. 
C. —Resistance to curly-top. The beets in the row on the right were the 
progeny of a plant selected for resistance. The control row adjacent on the left 
was from commercial seed. Both rows were exposed to the same natural infesta¬ 
tion of leafhoppers, and in addition all the plants of the selected strain had 
viruliferous leafhoppers caged on them. 
