34 



BULLETIN 847, U. S. DEPARTMENT OF AGRICULTURE. 



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No injury to trees. 



Do. " 



Do. 

 Trees killed. 

 Trees severely injured. 

 No injury to trees. 



Do 



Do. 



Do. 



Trees killed. 



Little injury. Eggs laid 



above wrappers. 

 Little injury to trees. 

 Grass and weeds kept 

 mowed around check 

 trees. 





Per 

 cent 

 borers 

 were 

 re- 

 duced 



by 

 treat- 

 ment. 



79.7 

 61.9 

 82.4 

 100.0 

 81.3 

 41.4 

 63.3 



3?!5 



69.0 



100.0 







62.5 

 37.5- 



14.3- 



Total 

 num- 

 ber 



of 

 borers 



in 

 check 

 trees. 



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Total 



num- 

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borers 



in 

 treated 



trees. 



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SS'SclS 



Num- 

 ber 

 of 

 trees 

 treated. 



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