Vol. XXV] ENTOMOLOGICAL NEWS 133 



the location and marking of the particular trees, in the bark of which 

 the broods of the destructive beetle had passed the winter. Two 

 areas representing centers of infestation were thus located and desig- 

 nated one as the Tenaya Project, the other as the Cathedral Project. 



Control work was started on the Tenaya Project on July I, and 

 finished when the beetles began to emerge from the bark on July 24. 

 Work on the Cathedral Project was started on September 8, after 

 the beetles coming from the overwintered broods had entered the 

 bark of the living trees, and was completed on October 7. 



The method recommended and followed was to fell the infested 

 trees, lop off the limbs, pile them on the prostrate trunk, and set fire 

 to it ; thus the infested bark was scorched or burned to a sufficient ex- 

 tent to kill the broods of the insects. The trees thus treated ranged 

 in diameter from 6 inches to 54 inches with the average of about 22% 

 inches. 



One thousand, six hundred and seventy-one trees were treated in 

 the two projects, at a cost of $1158, including all expenses except the 

 salaries of two representatives of the Bureau of Entomology who di- 

 rected and assisted in the work. 



It is claimed that this work, with an additional expenditure of about 

 $500 next season, will be sufficient to bring the beetle under such con- 

 trol that very little attention will be required to protect the remain- 

 ing living timber from further serious injury. Both this and an in- 

 festation in the timber around the rim of the Yosemite Valley will 

 receive the required attention next season. The Interior Department 

 has expressed a determination to prosecute a warfare against the 

 depredations of insects in the Yosemite and Glacier National Parks 

 to the limit of the funds available for the purpose. 



The insect which is directly responsible for the death of such a large 

 percentage of the lodgepole pine timber of the northern section of the 

 park is the mountain pine beetle (Dendroctoinis monticolac Hopkins). 

 It attacks perfectly healthy trees and kills them by mining between 

 the bark and wood in such a manner as to stop the movement of sap 

 and kill the bark which results in the final death of a tree within ten 

 to twelve months after it is attacked. This beetle is the most destruc- 

 tive enemy of the lodgepole pine, western yellow pine, and mountain 

 or silver pine of the entire Pacific Coast and Northern Rocky Moun- 

 tain region. A vast amount of the best timber of these regions has 

 been killed by this beetle during the past fifty years and has gone to 

 waste through the agencies of decay and forest fires, but, thanks to 

 the discoveries of the experts of the Bureau of Entomology, it can 

 now be controlled and a great waste of forest resources prevented in 

 the future. Office of Information, U. S. Dept. of Agriculture, Wash- 

 ington, D. C. 



