CONTROL OF THE PRINCIPAL INSECTS INJURIOUS TO 

 THE APPLE ABOYE GROUND. 



THOMAS J. HEADLEE, PH.D., ENTOMOLOGIST, NEW JERSEY AGRICULTURAL 

 EXPERIMENT STATION. 



Introduction. 



In the discussion which follows, an effort will be made to 

 treat of the species concerned and the operations for their con- 

 trol in the order in which they occur during the growing season. 

 Throughout this discussion it is assumed that we are dealing 

 with a bearing apple orchard. It must be remembered, in 

 considering the recommendations set forth, that they are based 

 on the writer's experience in New Hampshire and New Jersey, 

 and that while they probably apply pretty well to Massa- 

 chusetts conditions there is a possibility that some of them 

 may not fit entirely the local conditions. 



First Treatment. 



It is possible, with our present knowledge, to say that the 

 first spraying which the apple orchard should receive should 

 control San Jose, oyster-shell and scurfy scales, and the rosy, 

 the green and the oat aphis. In the past it has been custom- 

 ary to recommend a dormant treatment for the scale insects, 

 and a growing season treatment for the plant lice. 



About four years ago the New York Agricultural Experiment 

 Station at Geneva came out with a recommendation that an 

 effort should be made to kill the plant lice just as the buds 

 are opening, and to combine this treatment with the ordinary 

 dormant spray. The past three years' experience in New 

 Jersey has confirmed this idea, and shown that it is possible to 

 combine this treatment for plant lice with the ordinary dormant 



