Peach trees Avill usually be killed in two or three seasons, while pear 

 or apple trees will maintain a feeble existence much longer. This 

 insect, on account of its great similarity to certain other species of 

 scale insects, may not be positively determined except by specialists. 

 The occurrence of diseased and dying branches showing severe scale 

 infestation furnishes strong ])resumptive evidence of the presence 

 of this pest, but specimens of infested twigs should be promptly 

 submitted to a qualified person for examination. 



The appearance of a 3-year-old peach tree, ])resiuua})ly infested 

 from the nursery, is shown in figure 1. The principal limbs have 



Fig. 1. — Appearance of 3-year-old peach tree badly injured by the San Jose scale {Aspidiotus ptrniciosu^) 

 the larger branches having been killed. (Original.) 



already been killed, although new shoots have developed. A tree 

 in this condition generally may be saved by the thorough pruning 

 out of dead and badly injured wood and subsequently effecting the 

 control of the scale by spraying. 



The character of injury to an ajjple orchard, in which the trees 

 were infested from outside sources four or five years earlier, is shown 

 in figure 2. Although many of the limbs and branches are injured 

 or killed, such trees may be saved and brought into vigorous condi- 

 tion l)y thorough pruning, and by insuring the control of the insect 

 in the future. 



[Cir. 124J 



