FRUIT TREES AND THEIR ENEMIES . 3 



of the commoner pests for which the spraying is done, 

 would be somewhat useless. It is not, however, always 

 easy to identify an insect or fungus from a mere 

 description of it, and, whenever a grower feels doubt 

 on the subject, he should send a specimen for identi- 

 fication to some authority on entomology or on plant 

 diseases. 



