
a6 
has passed through a distinct cycle, increasing from 1923 to 1927, and 
decreasing from 1928 to 1930. In 1931 it was again increasing, the los-— 
ses being more than double those for 1930." Data submitted “emphasize 
not only the cycle of the infestation, but the varying intensity of the 
infestation in the different units." 
- "During the month (January) Ernest Wright, of the Office of Forest 
Pathology, Spent considerable time at the Berkeley laboratory working with 
the (fir bark beetle) Scolytus ventralis Lec. material which we have in 
F rearing," says J. M. Miller. "Mr. Wright has determined the fungus organ+ 
ism which is always associated with the attack of S. ventralis in the 
 cambium of white fir as Trichoderma sp. He is at present carrying through 
a series of cultures from both larvae and adults of the insects to de- 
termine whether they act as carriers of the disease, either externally 
or through the alimentary canal. He is cooperating with G. R. Struble 
Meo this project." 
"During the month (January) J. A. Beal completed a final report on 
the effect of a large logging operation in ponderosa pine timber on the 
population of the western pine beetle," says F. P. Keen, Portland, 
Oreg: "The results of this study showed that logging operations remove 
large numbers of the western pine beetle from the woods during the sum- 
mer months. About 50 per cent of the logs show attack by this beetle 
after two weeks' exposure. While newly felled logs proved to be very 
attractive to the western pine beetle, the results of the study indi- 
cated that the attractive influence was more or less local and that 
beetles were not attracted fror very great distances. Beetle infesta- 
tion located about a mile from some of the cutting operations contin- 
ued to increase during logging," 
Reporting on cooperative control projects, Mr. Keen says of the 
mountain pine beetle (Dendroctonus monticolae Hopk.) that "the control 
of this beetle in the recreational ‘areas of Crater Lake National Park 
has been very satisfactorily maintained through a system of annual main- 
tenance work on these units and the treating of epidemic centers in 
the surrounding country. In spite of the menace of near-by infestation 
annual reductions in the infestation of fully 75 per cent have been con- 
sistently secured except in one year, when a heavy migration of beetles 
into & cleaned unit completely overshadowed the results of the work. 
* * * The present program contemplates reaching out into the surround- 
ing areas and disposing of all concentrated centers, after which it is 
expected that a small amount of maintenance control will keep the for- 
ests in the protected areas reasonably free from infestation." 
T. T. Terrell and J. C. Evenden, of the Coeur d'Alene, Idaho, pro- 
ject for control of the mountain pine beetle, state that "it is very 
evident from this work that a serious epidemic has been prevented, which 
would have resulted in a tremendous loss of valuable white pine. Dur- 
ing these two seasons of control $176,566 has been spent for the treat— 
ment of 29,957 trees valued at $60,000. However, it is conservatively 
‘ estimated that as a result of this operation some 160,545 trees valued at 
$321,090 have been saved, which shows a net gain in timber values of 
i444 724." 
vy 
