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FOREST INSECL INVESTIGATIONS 
i, Co Craigheed, Forest Er.tomoelogist in Charge 
of the Western sabe ta men at K Lariat’ “Falls, poet The pieere ix ey : 
projects and the results obtained, aiso a 
detoliabing insects which are causing extensive 
: in the West. Forest insect surveys, including 
of the annual losses caused by barkbeetles aud special investiga= 
ticns on various phases of control, cycles of outbreaks, etc., will be 
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En route to Klamath adi Doctor Craighead will stop at the Minnesota 
Agricultural Experiment Station, St. Paul,Minn., to confer with Dr. Wm. Bs 
Riley and Dr. S. A. Grahem, aia with Re Zon Of the Forest Service 
Exveriment Station egarding investigations in forest insects in the Lake 
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states, in cooperation with these institutions, 
Dr. M. WV. Blackman, of the New Yorx State College of Forestry, 
recently SPen? several days in Washireton conferring with officials of the 
Division of F ore st Insects and examining types of Scolytidae. It was ; 
r understanding ae the PeSnes bae re forest insect investiga= 
tions conducted by the New York State College of Porestry and the Division 
t f th ean ake ‘at oaete gy would be of benefit to both 
Doctor Blackman has undertaken to assist the Division of 
in the determination of Scolytidae, 
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Je ©, Evenden has submitted some interesting data on the results of 
submerging white pine logs to destroy wood-boring larvae. During the season 
of 1922 & serious fire occurred in the Marble Creek drainage of the St. Joe 
River, Idaho. Several logging camps were destroyed, and from 150 to 200 
million board feet of high quality white pine was killed. Before the fire 
was compievely extinguished, plans were made for the edvedse of as large 
@ percentage of this fire-killed timber as possible. A few weeks after the Z 
fire it was noticed that a large percentage was pein cap infested with wood- 
borers. Inasmuch as freezing weather would set in within a few days, it 
was believed that little further damage would be done by the attacking OF 
larvae during that season, Furthermore, as these logs were to be driven 
through 30 miles of white water and 60 miles of still vater, which would 3 
require several weeks, it was believed that tne insects would be killed and a 
that there vould be no further damage to the ices, as the drive would occur oa 
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before spring activity would take place. When the first of these logs arrived ~ 
at the mill, however, it was found that the larvae were very mach alive and — 
Soon became active when placed in the sun, Though there was a very heavy 
mortality, there were still mamy larvae which were not killed by the sub- 
mergence in water for a period of over six weeks, of 
J. M, Miller has raised the question, "hat caused the outbreak of 
Dendroctonus brevicomis on the California National Forest?" An examination 

