Published November 1977. 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
Most insects are not pests. Only those that feed on desirable plants or transmit disease cause problems for gardeners. Many insects are very useful. Some are pollinators of fruits, flowers, and vegetables, while others help control insect pests.
There are three types of beneficial insects: predators, pollinators, and parasitoids.
The cards in this guide are designed to help
you quickly learn the main groups of natural
enemies of crop and garden pests, their
predacious activity, and tips for observing them.
Photographs are of the most common species in
the Pacific Northwest.
Hemlock woolly adelgid, Adelges tsugae Annand, is a destructive introduced pest of hemlock trees in eastern North America, and management has focused on the use of natural enemies through classical biological control. Two species of chamaemyiid flies, Leucopis argenticollis Zetterstedt and Leucopis atrifacies (Aldrich) have been collected previously from western...
Published September 2009. A more recent revision exists. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Reviewed July 2009. A more recent revision exists. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Stocks of salmon are declining in the Pacific Northwest. Based on region-wide studies that list and categorize the status of salmon stocks (Nehlsen et al., 1991; Huntington et al., 1994; and Nawa, 1995), I analyze the watersheds where stocks of salmon spawn for several anthropogenic variables, most of which are...
Published July 1987. 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
Large fallen trees in various stages of decay contribute much-needed diversity of ecological processes to terrestrial, aquatic, estuarine, coastal beach, and open ocean habitats in the Pacific Northwest. Intensive utilization and management can deprive these habitats of large fallen trees. The publication presents sound information for managers making resource management...
This publication gives a brief introduction to hazelnuts, which are sometimes called filberts. It provides an overview of hazelnut history, growth and production, geographic distribution, and hazelnut industry organizations.
I examined two amphibian communities to assess factors
that may impact amphibian biodiversity. The results suggest
that the potential factors which influence the maintenance
of amphibian biodiversity are multi-faceted and thus,
attempts to understand these factors must reflect these
complexities.
I investigated factors that influenced the susceptibility
of western toad...
Published March 1990. 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
Published January 1999. 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
Published 1966. Reprinted 1980. 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
Discusses recent trends in hunger and food insecurity in Oregon and the Northwest. Compares data for metro and nonmetro areas, and looks at the affect of employment type on rates of food insecurity.
With a little extra planning and care, you can enjoy fresh vegetables from your garden most of the year. Many cool-season crops produce well in the fall and, in mild-winter areas of the Pacific Northwest, hold through the winter if protected. You can plant these vegetables in mid- to late...
Reprinted November 1993. Declared out of print July 2010. 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
A stalagmite (sample OCNM8-02A) collected from Oregon Caves National Monument (OCNM) was sampled for stable isotope ratios in order to develop a record of Pacific Northwest climate history. Nine U-series dates indicate that the record spans the time period - 13.5 - 9.5 ka. The stalagmite growth rate varied from...
Diagnoses, synonymies, range maps, and an illustrated key are provided for the six species of Halictus found in the Northwest: H. confusus, H. farinosus, H. ligatus, H. rubicundus, H. tripartitus, and H. virgatellus. Observations by Chandler, Dolphin, and Roberts on nesting and foraging behavior is combined with a review of...
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Key to the Halictus Species of the PacificNorthwest
Diagnoses, synonymies, range maps, and an illustrated key are provided
for the six species of Agapostemcn found in the Northwest: A. angelicus, A.
coloradinus, A. femoratus, A. melliventris, A. texanus, and A. virescens.
Adults of both sexes of A. virescens share a nest. Peculiar linearly paired
male-female cells in nests...
A study of precipitation and yield levels in fallow-wheat rotations at three
Pacific Northwest locations demonstrated that in the Columbia Plateau region,
the variability and skewness of precipitation increased with decreasing mean
amounts of precipitation. The seasonal distribution of precipitation had a
marked effect on wheat yield. Comparisons of precipitation...
Bats represent the second most diverse group of mammals inhabiting the western slopes of the Cascade Range in southern Washington and Oregon Coast Range. Bat populations may well be sensitive to changes in forest age, structure, or distribution, but their nocturnal habits and high mobility render the study of the...
This key to the bee genera of the Pacific Northwest provides dichotomous couplets which aid the user in identifying 60 genera of bees which occur or may occur in the region. The key architecture is based strongly on the key to the genera of North and Central America published in...
This species key to female bumble bees of the Pacific Northwest provides dichotomous couplets which aid the user in identifying 27 species which occur or have occurred historically, and may still be present in the region. The key architecture is based strongly on the key to species for females found...
This species key to male bumble bees of the Pacific Northwest provides dichotomous couplets which aid the user in identifying 27 species which occur or have occurred historically, and may still be present in the region. The key architecture is based strongly on the key to species for males found...
Summertime low clouds are common in the Pacific Northwest (PNW), but spatiotemporal patterns have not been characterized. We show the first maps of low cloudiness for the western PNW and North Pacific Ocean using a 22‐year satellite‐derived record of monthly mean low cloudiness frequency for May through September and supplemented...
Few studies examine whether public attitudes toward forest management practices differ between public and private forests, with virtually no recent studies examining these differences in the Pacific Northwest, despite the coexistence of millions of acres of both public and private forest lands. Knowing whether public attitudes differ between public and...
Concerns about the extent to which major Pacific Northwest floods over the last decade might have been exacerbated by logging have heightened the need for a better scientific understanding of the role of forest maturity on snow accumulation and melt. To address this need, a multi-scale field and modeling study...
Published February 2008. Revised December 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog