WEST VIRGINIA EXPERIMENT STATION 



NO LIVING EXAMPLE OF THE DESTRUCTIVE SPECIES FOUND. 



No living examples of the insect (Dendroctonus frontalis) 

 which was the cause of such widespread devastation in the pine 

 and spruce forests of West Virginia and adjoining States, be- 

 tween 1890 and the fall of 1892, could be found in the early 

 spring of 1893, and none to my knowledge 

 have been observed or reported from the 

 effected area north of the 'Carolinas to the 

 present date, Dec. 1st, 1896. 1 



OTHER BARK BEETLES WERE NOT EXTERMIN- 

 ATED. 



The numerous allies of the destructive 

 pine bark beetle, in causing the death of 

 the trees and destruction of the wood, were 

 not, with one exception, injured by the 

 causes or conditions which resulted in the 

 extermination of their benefactor. 



SWARMS OF BARK BEETLES. 



Great migrating swarms of the surviving 

 species of bark and timber beetles accom- 

 panied by predaceous enemies, occurred 

 during the last of April and first of May, 

 Fig. L-Gaiiery of pen- 1893, throughout the principal pine and 



droctonus frontatis, 



of the State. The large tur- 



growth of wood. 



8 P ruce areas 

 pentine bark 



beetle Dendroctonus tere- 



brans occurring in far greater numbers than any other species. 



A NEW TROUBLE THREATENED BY THE SWARMS. 



The turpentine bark beetle (D. terebrans) invaded living 

 pines of all species, and the Norway spruce in May,1893, enter- 

 ing the bark at the base of the trees. This fact, together with 

 the excessive numbers of other threatening bark beetles, indi- 

 cated that the timber would continue to die from their com- 

 bined attack. 



J. Nor to the date of publication, May 1899. 



