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J. A. Beal has been spending the field season at Klamath Falls, 
Oreg. , Studying the effect of various methods of slash disposal upon 
populations of bark beetles. He has found that piled slash breeds nearly 
four times as many beetles as that scattered on the ground and exposed 
to the sun. 
W. J. Buckhorn and two summer assistants, Noel D. Wygant, from 
Purdue University, and Alexis T. Kornouhoff, of the Oregon State College, 
have just completed the annual survey of the pine beetle in southern 
Oregon. Records have been kept for 10 years on 30 plots of one square 
mile each to determine the annual loss through attacks by the beetle, 
the effect of control work, and the relation of losses to climatic condi- 
tions. The surveys have shown a total loss during the past 10 years of 
14 p. 
The Taitos part of July was spent by J. C. Evenden, of the forest 
insect field laboratory at Coeur d'Alene, Idaho, in checking the results 
of control PEPIPOEE instituted last spring on the west side of Glacier 
National Park, and in examining areas containing new outbreaks. The re- 
Sults obtained by the control projects were very gratifying, as only a 
few newly infested trees could be found within the areas covered by con- 
trol. Examination revealed several serious situations that will re- 
Guarg control measures during the fall.of 1950 and the. spring of 1931. 
Mr. Evenden has just returned to Coeur d'Alene from central Idaho, 
where he examined outbreaks of Dendroctonus monticolae Hopk. (mountain 
pine beetle) within the stands of lodgepole pine in that region, as well 
as infestations by the tussock moth in the fir forests. Though large 
areas of timber have been destroyed, the outbreaks of the tussock moth 
Hemerocampa pseudotsugata McD.) have been successfully reduced through 
the activity of beneficial insects. In some areas there was a little 
feeding by this moth in 1930, but it is believed that the epidemic in all 
areas is at an end. 
A. L. Gibson, of the field laboratory at Coeur d'Alene, with three 
assistants, is making an insect survey of the Beaverhead National Forest, 
in Montana. This survey is projected on a 10-year basis, to obtain data 
as to the spread and development of epidemics of Dendroctonus montioclae 
in lodgepole pine. The infestation in the Beaverhead Forest is being 
fed from a severe outbreak on the Bitterroot and Salmon Forests to the 
north. 
Donald DeLeon, of the field laboratory at Coeur d'Alene, has been 
located at Metaline Falls, Wash., during the season, where he is making 
an intensive study of all insects found in association with Dendroctonus 
monticolae in white pine. The purpose of this study is to determine 
what insects contribute to the prevention of epidemics of Dendroctonus, 
in the hope that artificial control can be so directed as to take full 
advantage of such agencies. 
