~ 3 = 





' At San Francisco a number of fine imported Chamaecyparis and Retinospora 
were affected with dying twigs, and the nurserymen were afraid that the entire 
trees would die, The trees are especially valuable at this time because the 
“quarantine regulations now forbid their importation. The cause of the trouble 
was found to be the Monterey cypress bark--beetle, Phlocosinus cupressi Hopk, 
“The beetles bore into the small twigs, possibly for food, and this causes the 
twig to break over thd lose color. Usually not much real damage is done,. 
but the tree looks badly for a while, 
y The tops of numerous poplars on an estate near Redwood City, Calif,, 
have been killed by the Pacific flatheaded poplar girdler, Agriius nevadensis 
Horn, The beetles which originally caused the trouble appear to have come 
_ from the native black cottonwoods along the banks of the creeks, Cutting out 
and burning the infested wood was recommended for control, 
J. M, Miller reports that last season it was discovered on the Arrowhead 
_ take Project, Calif,, that submergence of the logs in water for several days 
Was not an effective method of killing Ips beetles. This season some exper= 
iments are under way at North Fork to determire whether prolonged submergence 
' will result in effective mortality. These tests, which include both Ips and 
| Dendroctonus brevicomis Lec,, are veing carried out by Mr. Wagner, ney have 
now been under way for a month and so far the experimenters have not succeeded 
_in drowning any beetles, Broods of D. brevicomis came out of the water in 
fine condition after three weeks! submergence. They apparently become dormant 
while in the water and do not develop but recover and resume activity within 
a few hours after they are brought into the air. 












Mr, Edmonston and Mr. Hofer are camped at Bright Angel, on the north 
Tim of the Grand Canyon, engaged in an examination of the 17,000 acres treated 
last season. The purpose of this survey is to determine the results of last 
_ season's work and to formulate plans for next season, 
J, C, Evenden states that a reexamination of the dying fir and svruce 
“in the Yellowstone National Park was made and a large number of larvae vere 
collected and mailed to the Coeur d'Alene, Idaho, station for rearing, ‘These 
have emerged and are the spruce budworm, Cazsvecia fum.ferana Olem,, as determined 
by Mr. Heinrich, The epidemic in the Park is avparentiy spreading and a great 
deal of damage will be done unless it is redvced by natural agencies, There 
was @ serious infestation in the lodgepole pine some few years ago by the 
mountain pine beetle, but very little new work was recorded. 
4 An examination of the dying alpine fir in the Glacier National Park was 
made during the past month, The trees are Deing killed by a small bark~beetle, 
Dryoceetes sp. This attack occurred in the top, amd each year a lower portion 
of the bole is attacked, As many as four years are required to kill some of 
the larger trees, In many cases smaller trees are kiilec in one year, During 
the latter part of August a further examination wiil be made of this damage, 
with the purpose of recommending control measures of some sort, if possible, 

