1917 



ENTOMOLOGICAL SOCIETY 



131 



Cost of Treatment. 



It was at first thought that the cost of treatment might prevent its use under 

 nursery conditions innsmncli as jjoplars arc not very iiigh jjriced stock. In one 

 nursery a careful account of the entire cost of treatment was kept and is shown 

 below. 



Labor to treat 14,000 trees $18 50 



Material, carbolineLim, 7 gals at 90c 6 30 



Total cost $24 80 



Total cost per tree . 00177 



It will thus be seen that the cost per tree is extremely .<mall, not exceeding 

 two-tenths of a cent, a practically negligible charge. 



Note work of borer just where treat- 

 ment with carbolineum ends. 

 Shown by arrow. 



Carbolineum treatment ends at 

 arrow point A. Note the two 

 borers near base of 

 the tree. 



SUMMAKY. 



The poplar and willow borer is a serious pest in restricting the production of 

 Carolina poplars in our nurseries. Many nurseries have either given up raising 

 them or are planning to do so. 



The trees attacked l)y this lieetle include a wide variety of poplars {Fopulus 

 spp.) and willows {Salix spp.). Tiie trees are valuable both as ornamental, shade 

 and forest trees and the depredations of this insect are sometimes serious. 



Almost perfect control was secured by treati]ig the trunk of infested trees, 

 under nursery conditions, with carbolineum. The material is inexpensive and 

 easily applied. 



