IXSECTS AFFECTIN'G PARK AND WOOUI.AN'n TREES 79 



has fouiul that it i)a\s to use carl)()n hisultul on tlie more valuable trees. 

 The insecticide is carrictl in an oil can and when a caterpillar can be 

 located, the chemical is injected in the I)urrow ami the hole sealed with 

 putty. The deadly fumes soon make their way to the borer and kill it with 

 little or no injury to the tree. As the carbon bisulfid is very volatile, its 

 vapor inrtammable and e.xplosive, great care must be taken to keep it from 

 all fire. Mr M. F. Adams of Buffalo N. Y., who has tried some experi- 

 ments in fighting borers, recommends the use of newly matle hard soap 

 in the place of putty for plugging the holes after the carbon bisulfitl has 



been inserted. 



Bibliography 



1893 Lintner, J. A. Ins. N. V. 9th Rcp't, p. 426-27 



1898 Felt, E. P. Fish. Game and For. Com. 4th Rep't, p. 380-84 



Carpenter worm 



Prionoxysttis robiniac Peck 



A large reddish white caterpillar boring large holes in the solid wood of different 

 kinds of oak, maple and locust belongs to this species. 



This insect is a serious enemy of several of our native trees, though it 

 rarely causes their death because its operations are confined very largely 

 to the heartwood. It frequently produces serious deformities and thus 

 renders unsightly trees which should be an ornament to the landscape. 

 The writer's attention was called to this insect in 1900 by Miss Mary B. 

 Sherman of Ogdensburg N. Y. Two pupal cases were sent June 16, with 

 the statement that they were projecting froin the trunk of a maple tree 

 which was full of burrows, and July 2, a moth of this species was taken on 

 one of the infested trees. E.xamples of this insect's work were subse- 

 quently sent from Ogdensburg, and ^-^ of the section of a tree about 15 

 inches in diameter was riddled with the large burrows of this wood borer. 

 Miss Sherman stated that it was so abundant as to ruin a number of fine 

 maples in that locality, over 20 of these caterpillars being taken from a 

 single trunk. About this time Mr M. F. Adams reported this insect as 

 quite injurious to ash trees in the parks at Buffalo, and through his 



