DESTRUCTIVE INSECTS. 



193 



in general to most localities in the United States north of 

 Washington, D. C. In Canada the moths do not begin to fly 

 until about a month later, while in the South they appear a 

 month or more earlier, so that the dates in the above sketch 

 will not apply to these regions. 



The insect is open to successful attack only in its larva or 

 borer stage, and in its 

 pupa stage; the pupae 

 are reached only by 

 searching for the co- 

 coons and destroying 

 them. 



After four years of 

 careful experimenting 

 with most of the meth- 

 ods recommended to 

 control this pest, we are 

 led to the following con- 

 clusions : 



The " digging out" 

 method is the only 

 thoroughly successful 

 and safe way of killing 

 the peach-tree borer. 

 This method is expen- 

 sive in time and labor, 

 but our experience leads 

 us to believe that any 

 other equally as suc- 

 cessful method will cost 

 just as much. To make 

 it a success the " dig- 

 ging out" should be 

 thoroughly done, not 



only on every tree in the orchard, but also on all " old relics " 

 of peach-trees in the immediate neighborhood. A half-dozen 

 such " old relics" left untreated near by will serve thoroughly 

 to restock an orchard with borers every year, so that the " dig- 

 ging out " method, although practised each year, will never 

 reduce the numbers of the borers below the danger limit. 



FiG. 259. Work of a Single Borer in a Peach- 

 tree, natural size, w , Burrow of borer ; 

 g, gummy mass ; /, pupa projecting from 

 cocoon. 



