The purpose of this watershed assessment is to provide an inventory and characterization of
watershed conditions in the Wilson River watershed and to provide recommendations that
address the issues of water quality, fisheries and fish habitat, and watershed hydrology.
In Oregon’s northern Willamette Valley, cabbage maggot (CM), Delia radicum (L.) (Diptera: Anthomyiidae) often renders Brassica root crops unmarketable. Scheduled insecticides are the only current control. Studies were conducted to: 1) describe and characterize spring emergence of CM flies and their seasonal flight activity relative to degree-day (DD) accumulations; 2)...
The purpose of this study was to determine and explain
attitudes toward intercollegiate athletics of undergraduate
students in three academic majors attending Oregon State
University.
The attitudes of a proportionate random sample
consisting of 215 students were measured according to their
responses to thirty-two Likert scale items containing six
sub-scale...
The shake and wash technique (samples placed in a jar with alcohol added and
shaken to remove the mites) was effective in removing 100% of the predator mites, and adult
spruce spider mites from Douglas-fir foliage and 98% of the spruce spider mite nymphs.
Eighty-eight percent of the spruce spider...
An investigation was conducted in 1980 and 1981 on the larval
parasitoid complex of the orange tortrix, Argyrotaenia citrana
(Fern.), a major contaminant in cane fruits (Rubus spp.) in the
Pacific Northwest. A total of 13 parasitoid species were reared from
1,350 larvae predominantly collected from red raspberries in western...
The GRASS (V. 4.0) geographical information system (GIS) was used to test
the hypothesis that pheromone trap based predictions of Helicoverpa zea (Boddie)
damage in processed sweet corn could be improved by considering spatial patterns of
corn plantings and wind blocking features around the trap. Wind blocking features
include: tree...
The twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is a
worldwide pest of numerous agronomic and horticultural plants. Conservation
biological control of this pest can be unreliable due to asynchrony of natural enemies
and certain horticultural practices that have a direct or indirect affect on natural
enemies and the...
In the past, a major emphasis of child development
research and theory building has been the study of
acquisition of sex role learning. Today, an additional
dimension is seen in the study of the effect of sex role
stereotypy on self-concept. As a result of the research in
this area,...
Forests face health threats from pests and diseases (e.g., mountain pine beetle, emerald ash borer, chestnut blight [CB], Swiss needle cast), and other issues such as climate change. Interventions such as genetic engineering (GE) have shown promise for mitigating some of these threats. CB, for example, has impacted most American...