~14- 
emergence of the overwintering broodse Though fall control is successful 
in destroying the insect broods, it has the disadvantage of destroying the 
beneficial insects as well, as the infested trees are felled and burned. 
Recent studies have shown that the bark beetles make two attacks. The 
overwintering broods emerge in May and attack, then emerge for their second 
attack during the latter part of June or early in July. Coeloides brunneri 
Vier., the most important parasite of the Douglas fir beetle, overwinters 
with the beetle broods but does not emerge until about the time the parent 
adults are emerging from the trees attacked in May for their second attack. 
To preserve these parasites, control measures are being directed against the 
May attacks during the period between the first and second attacks, This 
experiment should result ina saving of timber by preventing the second ate 
tacks, in the preservation of parasites to care for any portion of the in- 
festation missed during the project, and in a material reduction in the cost 
of the operatione 
Forest Service completes NIRA control projects.--J. Me Miller, of the 
Berkeley, Calif., field laboratory, reports that all bark beetle control pro= 
jects in California on which winter and Spring treating work has been under- 
way were completed by April 15. This is about 4 weeks earlier than the 
usual seasonal date for closing down such projectse It was fortunate that 
plans were made for this early completion of control work as the overwinter- 
ing broods of beetles started their emergence about one month ahead of schede 
ulée Precipitation for the spring period has been extremely light end the 
fire hazard became so great by the first of April that it was necessary to 
put on additional men to guard control fires. This latter factor has added 
materially to the cost of the work on certain areaSe One of the more im- 
portant, of these winter projects was a combined program by the Stanislaus 
National Forest and the Yosemite National Park. This work was directed to- 
ward the control of a large zone of infestation along the west boundary of 
the park which threatened a body of magnificent sugar, pine and ponderosa 
pine timber on national forest, patented, and park lands. Approximately 
3,500 trees with a volume of 5,500,000 board feet on 47,000 acres were treat~= 
ed during the past winter and spring. The primary infestation comsisted 
of the western pine beetle in yellow pine and the mountain pine beetle in 
sugar pine. 
The Hallts Flat project on the Lassen National Forest was another 
control undertaking completed by March 21. This project covered 18,000. 
acres, practically all Forest Service timbere A total of 4,155 trees with 
&@ volume of 4,000,000 board feet were treated. The species treated con- 
Sisted of western pine beetle and the pine flathead in ponderosa pine and 
Jeffrey pine. The Badger Springs project on the Modoc National Forest also 
Completed within this period covered 41,000 acres and accomplished the treate 
ment of 5,528 trees with a volume of 5,500,000 board feete 

Infestation types chenging on Modoe National Forest.--K. A, Salman, 
of the Berkeley, Calif., field laboratory, says that an exceptionally well- 
kept set of spotters’ records on the Badger Springs project has made possi- 
ble a detailed analysis of the, composition of the infestation that comprised 
the oVerwintering broods, The area of bark surface infested by several 

