
a 8 is 
October 8 in control of the Douglas fir beetle (Dendroctonus pseudotsugee 
Hopk.). He says: "The costs of this project are indeed gratifying, as some 
12,000 trees were treated at a cost of $0.77 per tree. This treatment 
entailed the felling of the infested trees and cutting the infested boles 
into logs, which were skidded into decks and burned." 

A. L. Gibson, Coeur d'Alene, reports: "Data relative to the Bea- 
verhead Insect Survey have been worked up, and show a tremendous in- 
crease in the number of lodgepole pine trees attacked by the mcuntain 
pine beetle (Dendroctonus monticolae Hopk.). The estimated loss during 
the 1931 season was in excess of 12,000,000 trees, while for the pericd 
from 1927 to 1931, inclusive, a total 18,500,000 trees have been destroy-— 
ed, Losses on the northwestern part of the forest probably reached 
their maximum in 1931. Eastern and southern parts of the forest will 
probably show increasing destruction for a number of years. Diminishing 
food supply for the insects on the heavily infested parts of the forest 
should favor an increased migration of the mountain pine beetle from 
such areas. The results of this survey show quite definitely that in- 
sects are migrating from distant sources of infestation into areas on 
that portion of the Beaverhead previously considered as the Madison 
Forest." 
K. A. Salman, Berkeley, Calif., reporting on regional survey stud- 
ies of western bark beetles, says: "Brood records from both the Sierra 
and Mcdoc areas, where widely separated epidemics developed in 1931, 
have shown that the prolonged season resulted in the activity and at-— 
tacks of the western pine beetle (Dendroctonus brevicomis Lec.) con- 
tinuing until early in November. * * * about a month later than normal. 
* * * One striking difference in the insect population of the overwin- 
tering trees was uncovered by bole examinations after the trees were 
felled. In the Sierra area a high per cent of the infested trees were 
first attacked in the tops by the five-spined engraver beetle (Ips con- 
fusus Lec.). This topkilling, which usually extended downward for a dis— 
tance of from 25 to 50 feet, was followed by the attack of the western 
pine beetle in the lower bole. In the Mcdoc areas, however, no infesta- 
tion of the engraver beetle was found, but tops of many trees were killed 
by flathead borers, Melanophila spp. It is believed that this topkill- 
ing, by insects normally secondary to Dendroctonus in their attack, is 
mainly due to the weakening of the trees in the late summer by the pro- 
longed dry season of 1931." 
"Results of the Devil's Garden experiment (Modoc National Forest), 
where for the past three years an effort has been made to exterminate 
completely the western pine beetle on a small isolated area of western 
yellow pine, were worked up during the month by K. A. Salman and P. C. 
Johnson," states J. M. Miller, Berkeley, Calif. "These preliminary re- 
sults indicate that the work was not successful in exterminating the 
beetle, * * * However, the infestation of flathead borers (Mslanophila) 
