REPORT OF THE STATE ENTOMOLOGIST I9II 



113 



This also applies to trimming-s and small limbs which have no 

 commercial value. If it is impractical to work up log's and 

 burn the slab wood, the insects can be destroyed by a pro- 

 long-ed submergence in water or by removing only the bark 

 and burning that. 



Two-lined chestnut borer (Agrilus bilineatus 

 Weber). An investigation of conditions on the estate of Mr 

 Norman de R. Whitehouse at Old Westbury, N. Y., showed 

 that there were probably some two hundred red oaks which 

 had been killed by this pest. Most of the affected trees were 

 small with a trunk diameter of less than six inches and were 

 usually well shaded and therefore presumably less vigorous. 



Fig. 5 Two-lined chestnut borer: a=adult beetle, enlarged; 6=antenna of same, enlarged 

 $ =claws of posterior tarsi of female, somewhat enlarged; 5=same of male, somewhat enlarged; 

 c=larva, enlarged ; c/=pupa, enlarg-d. (After Chittenden, U. S. Dcp't Agric. Div. Ent. Cir. 24, 

 2 ser. '97) 



A few of the rather scarce, larger trees were also affected. 

 One group consisted of three with diameters of about fifteen, 

 twelve and nine inches, respectively. They had died during 

 the summer, probably in late August or early September, and 

 were standing near a tree about nine inches in diameter which 

 had evidently been killed the preceding season. This is an 

 instance of the beetle being somewhat local in habit and con- 

 ditions comparable to those frequently noted in the case of 

 the allied bronze birch borer, Agrilus anxius Gory, 

 another pernicious enemy of trees. The galleries of this chest- 

 nut and oak pest were rather common in oak stumps at Nas- 

 sau in a wood lot where limited annual cutting was the prac- 



