162 



FRUIT INSECTS 



egg punctures. It causes little injury, however, because the 

 inner bark continues alive and there is no dead area between the 

 slits. 



Ceresa taurina Fitch and C. borealis Fairmaire, two forms 

 closely related to the buffalo tree-hopper, deposit their eggs in 



Fig. 167 a. — Apple twigs showing egg-scars of the buffalo tree-hopper. 



the buds, within the outer bud-scales. They cause no appre- 

 ciable injury. 



Reference 

 N. Y. (Geneva) Agr. Exp. Sta. Tech. Bull. 17. 1910. 



The San Jose Scale 

 Aspidiotus perniciosus Comstock 



The San Jose scale has attained greater notoriety, has been 

 the cause of more legislation, both foreign and interstate, and 

 has demonstrated its capabilities of doing more injury to the 

 fruit interests of the United States and Canada than any other 

 insect. The ease with which it is widely distributed on nursery 

 stock, the practical impossibility of exterminating it in a locality, 

 its enormous fecundity enabling it to often overspread the bark, 

 leaves and fruit of trees in a very few yearg, and the fact that it 

 attacks practically all deciduous fruit and ornamental plants, 



