JO ANNUAL REPORTS O] DEPARTMENT 01 AGRICULTURE, L949 
planting with the valuable ponderosa and Jeffrey pines was attempted, 
many 01 the trees died during the first decade owing to inroads by a 
pine reproduction weevil (Cylindrocaptunu eatoni Buch.). 
Recently uew strains of pine developed by the Institute of Forest 
Genetics al Placerville, Calif., bave Been tested under cage control by 
forest entomologists i<> determine their resistance to wreevil attack. 
The in"-i resistant strain yet found is a cross between Jeffrey and 
Coulter pines. The Jeffrey parent of 'In- new hybrid bas excellent 
wood qualities but is susceptible to the weevil; the Coulter parent is 
highly resistant to the weevil but has inferior wood qualities. Thus 
far the hybrid has shown resistance to weevil attack equal to that of 
Coulter pine. In L948 Held plantings were made to test this new hy- 
brid in brush-field areas where Jeffrey and ponderosa pine had failed. 
If the hybrid shows the same degree of resistance in these Held plots 
as it has in preliminary tests, the prospects for successfully planting 
brush-field area- with a fast-growing, good-quality variety of pine 
will be great lv improved. 
En pel m a ii ii Spruce Beetle Still Active in Colorado 
The outbreak of the Englemann spruce beet le in ( Jolorado appealed 
to be dying out in 1947, after killing about 4 billion board-feet of 
spruce, valued at about $8,000,000. This loss represented about one- 
tenth of the timber volume in Colorado. Surveys in the fall of 1948 
showed that the infestation was still spreading in a northeasterly 
direction into the Routt and Arapaho National Forests and threaten- 
ing extensive spruce stands farther east. In it- wake practically all 
the spruce trees eight or more inches in diameter had been killed. At 
first only the larger and overmature trees were killed, but since 1946 
the beetles have attacked even the young and most vigorous trees left 
in tin' area. The loss of the young stand in addition to the mature 
i iee- will greatly reduce the possible harvest for many years t<» come. 
Fortunately, there is enough natural spruce reproduction to regener- 
ate the forest on the hundreds of thousands of acres involved in the 
outbreak, provided the area can he protected from lire. Everj effort 
i- being made to salvage the dead trees for pulp. 
Research on Insects Affecting Fores! Products S1k>\>^ Progress 
Studies on the biology and control of insects affecting forest prod- 
acts have been continued in cooperation with the Army Corps of 
Engineers. 
It ha- been found that large population- of Lyctus powder-post 
beetles can he reared for testing purposes on freshly cut and seasoned 
limit wood of oak. ash, and hickory. Beetles U'A on tin- favorable 
materia] mature in I month- instead of the normal ( .» months. In 
experiments for the control of these beetles, DDT, benzene hexachlo- 
ride, chlordane, toxaphene, and pentachlorophenol, applied a- •".- 
minute dip-. wr\c found to he effect i ve as both preventive and remedial 
measures under laboratory conditions. Tests with fumigants were 
continued at the Aimv Btbrage depot at Mna Loina. Calif. About 
infested wooden cots were fumigated under tarpaulins for 72 
