42 INSECTS INJURIOUS IN 1902. 
like swellings. The woolly colonies on the branches can be seen 
during the entire summer and even late in the fall. They par- 
ticularly affect water shoots, which, of course, are not allowed 
Fig. 38.—Woolly Aphid (S. lanigera) on young apple. 
to grow in a well kept orchard or nursery. Northern Spy stock 
is said to be immune. 
During the summer the wingless females produce living 
young, females like themselves and without wings. Toward Fall 
