Western spruce budworm defoliated area in the Northern Region has differed significantly across three discrete geographic zones during the past decade. Aerially visible defoliation in northern Idaho increased from 1.7 million acres in 1969 to a high of 2.2 million acres in 1974, and declined to none in 1979. Defoliated...
Published September 1982. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Two populations of the pine needle scale, Phenacaspis pinifoliae
(Fitch), were studied. One population was located in Corvallis,
Oregon, and the other population was located near Santiam Pass,
Oregon. Both populations were feeding on Pinus contorta.
The Corvallis population was unisexual, univoltine, and over
wintered as both eggs and adult...
The Bureau of Entomology has been conducting systematic and economic
investigations of the weevils infesting the bark of the trunk and
terminal shoots of conifers in the United States, the results of which will be
published in the regular technical and popular bulletins ; but since these can not be...
The biocontrol potential of Trichoderma harzianum strains
B-2A, B-8A, B-4B, B-15B, and B-41 and Serratia plymuthica was
evaluated using agar plates and wood wafers of unseasoned
ponderosa pine (Pinus ponderosa laws). All five isolates of
Trichoderma harzianum and Serratia plymuthica could inhibit
stain fungi growth in agar plates and exhibited...
Stepwise multiple regression techniques were used to statistically analyze the relationships between damage caused by the pine needle sheath miner Zellaria haimbachi (Busck); a needle miner, Oenerostoma etrobivorum (Zeller); sugar pine tortrix, Choriatoneura Zambertiana (Busck); and ambient and foliar concentrations of fluoride in lodgepole pine (Pinue contorta v. Zatifolia Engelm.)...
Shade tree insect and disease activity within the city limits of Bozeman, Montana, were evaluated. Other than a few minor insects, the park, cemetery, and street trees are in remarkably good condition. Both the Park Department and private homeowners appreciate the value of trees in the urban environment. Recommendations on...
A supplemental Douglas-fir tussock moth egg mass evaluation was made within three quarter sections north of Poison, Montana, during April 1975. These areas were being considered for a pilot control project of a nucleopolyhedrosis virus spray. Results from the April evaluation showed these areas no longer qualified as sites for...