

































materials are sprayed with softer metals vhich have already been penetrated 7 
by the insects, Several alloys appear to be promising, but some metals have 
failed on account of rapid oxidation, 
J. Zetek, of the Division of Tropical Fruit Insects, and Dr,.Snyder, 
of this office, have been working since February on a manuscript on the 
biology and control of the termites of the Canal Zone and near-by Panama, 
The paper will be well illustrated, and will urge the economic importance : 
of these very abundant insects, advocating and describing effective measures — 
for control, In the Canal Zone are 35 knom species of termites, representing 
ee genera or subgenera, A map will show their distribution, 
Je M. Miller spent the period from May 19 to May 23 on the Snake Lake . 
light burning experimental area in company with Mr. Show, of the Forest Service 
This experiment was undertaken in the Plumas National Forest in 1919 to test 
out the results of periodically burning the ground cover in a selected forest 
of c0O acres. One of the most important results to date has been the concen- 
tration of barkbeetles on the area following the fire. The number of trees 
killed by the insects considerably exceeds the number of those killed by the 
fire, but in this case the light damage by fire appears to have been a factor 
in attracting barkbeetles to the trees. The study of the interrelation of 
insects and fires is being carried on cooperatively with the Forest Service ing 
District 5, 
H. Ll. Person and Albert YJagner have just completed a survey of the 
cutover areas on the Sierra National Forest, to determine the extent to 
which insect losses are affecting the second crop of timber. 
During the first part of May a preliminary examination of the proposed 
forest insect control project in the Missoula National Forest was made by 
J. C. Evenden and Elers Koch, Assistant’ District Forester, District l. This 
project calls for a line of defense against the heavy epidemic of the mountain 
pine beetle, which threatens the valuable lodgepole pine stands of the Deer 
lodge and southern Missoula National Forests, At the present time H. J. Rust, 
Entomological Ranger of this Station, is marking the trees that are to be 
treated, and it is expected that control work will be started by May 22. 
Mr. Evenden left Coeur d'Alene, Idaho, on the 20th of May for the . 
experimental control project on the Coeur d'Alene National Forest. Mr. Evenden © 
w7as accompanied by Mr. Mooney, of the Coeur d'Alene Forestry Office, who will 
have charge of the administrative work of the project. Several days will 
be spent in marking the trees prior to the arrival of the crew. The very 
early and dry spring which this region has experienced has made it necessary 
to start this project some ten days earlier than vas planned, because of the 
advanced devolopment of the insect broods, a 
J. E. Patterson and P. D. sergent, of the Ashland Field Station, are ~ 1 
eruising the timbered zones adjacent to the Greenspring road slash in southern . 
Oregon. This slash study was started in 1920 and will be completed the present 
season, It consists of the analysis of the attack and infestation of Dendroctonu 
