344 
ies, Fe eet 
those killed in 1932, and in no instance was an incrense reported. 
This improved situation is due to the destructivn of broods by cold 
weather last winter and by improved vigor of the trees as a result o 
better moisture conditions. However, on some arcas the beetles are” 
showing signs of aggressiveness and are incréasing the severity of — 
their attucks. In such cases control work has been advocatec and is”) 
now in progress on the Ochoco National Forest, the Deschutes National 
Forest, and the Yakima Indian Reservation. It is honed that this work” 
will result in permanently suppressing this very oimoxious pine de- 
stroyer. ; 














Freserving Pire-killed Douglas fir through tree medication 
planned. ans brass work on a new Sea the prevention of inseey” 
damage to fir silied Douglas fir, was begun in peices by the Porta 
land laborato t is planned as one pieihs of a APper coopere tive BY he 
ee) 
as 
2 
é 
project betwee <i Bureau of Entomology, the * Plant Dna iustry ee 
and -the Faceted Northwest Forest Experiment Station. J. M. Whiteside 7 
has recentiy been appointed on # C W funds ti supervise the entomoleg— = 
ical phase for the Bure of Entomology. The stud is composed of Fie 
two major parts: (1) A determination of the losses in iire-kiljed heh” 
Douglas fir, what they consist of, and how rapicly oa uncer whet cones 
diticns they occur; (2) experiments on the prevention of these JO8Ses- boned: 
through tree medication, water storage, felling, etc. A serics of 
fires of different ages are being located and achat vor further 
study. A small number of recently burned ae nave alreedy been in- 
jected with corrosive sublimate and eosin dye to dete-mine whether or 
not these trees will take up the solutions. vit werk jlan for the pro-— 
ject-is being made 
Foliage injured by insucticides.--S. F. Potts, of the Melrose 
Highlands, Mass., field laboratory, reports that in compiling data on- 
fuliage-injury experiments he finds that 0.85 percent of the arsenic 
applied ts the leaf in lead-aursenate snoray wes recovered in the leaf - 
tissue. This is 7 to 15 percent of the soluble .orti.n ae. Wee cun— 
verted into grains of Ase05 per pound cf leaves, is cons reer. ; aboven 
what the pure ford and drug law allows on edible food. ‘In the se ore 
calcium-arsenate spray approxinately 1.5 nercent of the meterial. un— 
plied was recuvered in the tissue. Bordoaux mixture sreatly reduced 
the quantity of tissue arsenic from calcium arsenate. Ina 4-4-5060 
Sordeaux nixture, from 2 te 5.5 percent of the quantity of copper ap 
plied to the leaf surface was recovered in the tissue. The calcium’ 
arsenate in Bordeaux mixture adhered well, did not irjeve deciduous — 
forest foliage, and was easily removed from Sprayed surfaces with weak | 
acids, as compared with lead and arsenic rom les? srsenate. 
Gipsy moth eps clusters nore abuncant.--Eg? clusters of the gipsy 
moth are more abundant in New England &. this’ fall) thin” iaes, jude 3 by 
