48 INSECT AND FUNGOUS ENEMIES OF THE APPLE. 
per tree. This information is not only an index to the thoroughness 
of the spraying that is being done, but is especially useful in arriving 
at an estimate of the amount of spray chemicals to be purchased. 
The quantity of liquid to be used on trees and foliage naturally 
varies with the size of the tree. For orchards just coming into bear- 
ing and with average-sized trees 8 to 10 years old, a proper manipu- 
lation of the nozzle should insure thorough spraying with 3 or 4 
gallons per tree. For average-sized trees 12 to 15 years old the 
amount of spray required per tree would be from 5 to 7 gallons, and 
for older trees a larger quantity will be required, all varying with 
the size of the opening in the nozzle used and the rapidity with which 
the work is done. Very old trees of considerable height and spread 
of limbs often require from 10 to 15 gallons per tree to insure a 
thorough treatment. 
[A list giving the titles of all Farmers’ Bulletins available for distribution 
will be sent free upon application to a Member of Congress or the Secretary of 
Agriculture. ] 
492 
O 
