Studies to identify the environmental factors that influence the rate of ectotrophic mycelial growth of Phellinus weirii (Murr.) Gilbertson along Douglas-fir roots were undertaken both in the laboratory and in the field. The effects of soil pH, nitrogen, moisture, temperature, microorganisms and bulk density were investigated. In the lab, the...
Phellinus weirii (Murr.) Gilbertson, cause of laminated
root and butt rot, is a heterothallic basidiomycete lacking
clamp connections. Two biological species groups of the fungus
have been hypothesized, the Douglas-fir and cedar-types, on the
basis of physiological, morphological and epidemiological
differences. Single-spore and vegetative isolates differ in
cultural morphology, nuclear...
The root systems of Douglas-fir trees infected with
Verticicladiella wagenerii and assigned by crown color and terminal
growth characteristics to several stages of decline were excavated at
three widely separated sites in the Coast Range of Oregon. Data were
gathered on insect species present, extent of colonization of the root...
To determine which isolates will most rapidly replace
Phellinus weirii in stumps and roots, Trichoderma spp. were
isolated from P. weirii-infested stumps and roots, identified, and
examined for growth rates and lethal effects on P. weirii in vitro.
Phellinus weirii-infested Douglas-fir stumps and stump roots
were sampled for microorganisms by...
Groups of second-growth Douglas-fir (Mirb.) Franco were excavated
in plots of two to six trees on two sites in the vicinity of Cowichan
Lake, Vancouver Is., British Columbia. Eleven excavation plots provided
36 trees which could be studied in pairs (a total of 50 pairs) in order
to ascertain the...
Alaska-cedar (Chamaecvparis nootkatensIs (D. Don) Spach) is a
valuable tree that is suffering from a serious decline and mortality of
unknown cause throughout southeast Alaska. Epidemiological and
pathological studies were initiated to determine if a pathogen is the
primary cause of this problem. By examining old aerial photographs and
by...
Verticicladiella wageneri Kendr. is a vascular wilt pathogen of
Douglas-fir in the Pacific Northwest, The disease is characterized by
black staining of colonized sapwood; crown symptoms are those typical
of a wilting syndrome. Histopathological studies revealed that the
pathogen is limited to the xylem but causes vascular dysfunction in
both...
Phellinus arctostaphyli (Long) Niemela, P. igniarius
(L. ex Fr.) Quel., and P. tremulae (Bond.) Bond. et Boriss.,
heartrotting hymenomycetes in the family Hymenochaetaceae
(Aphyllophorales), all conform to a multi-allelic heterothallic
mating system. Both compatible and incompatible
reactions result from pairings of homokaryons from the same
basidiocarp. Homokaryons isolated from different...
Understory species associations and their association with tree species were examined on three intensively studied stands. We studied the chronosequence of understory species associated with different aged singleleaf pinyon (Pinus monophylla Torr. and Frem.) trees. Mid- to late pinyon-juniper understory succession was found to be more spatial than floristic in...
The shallow, wave-swept sea floor off the central Oregon coast
is used by 0-age flatfishes as a nursery ground. This dissertation
is based on a series of projects designed to: 1) identify the dominant
meiobenthic nematodes present in a coastal nursery area; 2)
describe the important temporal and spatial scales...
Aquatic communities consisting of guppies, amphipods, copepods, snails, nematodes, rotifers, protozoans, euglenoid flagellates, and other microorganisms were established in sixteen laboratory microcosms. Guppies were exploited at four different levels (0 percent, 10 percent, 20 percent, and 40 percent of the population biomass) with four communities at each level of exploitation....
Anomaly timescales for the last 90 million years, derived from
marine magnetic profiles and published prior to mid-1979, are summarized,
illustrated for comparison, and critically reviewed. A revised timescale
is constructed using calibration points which fix the ages of anomalies
2.3', 5.5, 24, and 29. An equation is presented for...
Published June 1984. 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
The classical two-dimensional wavemaker problem is formulated for
linear waves. Two conformal mappings are applied to the mathematical
formulation to transform the wavemaker problem into a unit disk. It is then
shown that this technique cannot produce in practice a numerical
representation of the fluid motion throughout time for any...
This study compared leaf mold, bark, automobile waste and the
combination of half leaf on the top and half bark on the bottom as
growing media for young apple nursery stock. Although the chemical
and physical analysis of leaf mold was superior to the bark, trees
in leaf mold showed...
In spite of the high family demands associated with having an infant, an increasing number of women are choosing to retain close ties to the labor force during this period. This study explored the employment adjustments and job satisfaction of a group of women who became mothers for the first...
Noise induced hearing loss is a subject of growing
concern. Over the past 15 years, several well-documented
studies have been completed which express the relationships
between industrial noise exposure and damage to normal and
pathological ears. This research has provided knowledge of
considerable importance to developing successful hearing
conservation programs....
Water temperature influenced interactions between redside
shiners and juvenile steelhead trout (≥1+) in the field and the
laboratory. Distribution of the two species within various habitats
was determined in three streams with different water temperature
regimes. The range of habitats occupied by trout in allopatry at
cool temperatures and at...
Temperature was observed in the upper 80 m by moored thermistor chains at three locations in Rockall Channel west of Scotland. Isotherms were interpolated, and a 1‐week period of exceptionally energetic tidal oscillations was analyzed. The moored array (horizontal separations ranging from 6 to 20 km) was used as an...
The purpose of this study was to identify the dry season
vegetable production sources of information, technical knowledge
base and needs of women farmers expressed by the women farmers
themselves in Ngabu Agricultural Development Division, Malawi,
Central Africa.
The objectives were to identify the following aspects of dry
season vegetable...
The present study investigated the contribution of
attention to one-handed catching success. A group of
skilled (N = 8) and non-skilled (N = 10) subjects were
compared in their ability to process secondary task
information while executing a primary one-handed catching
task. On 40% of the trials, a secondary visual...
This study examined the relationship between a spouse's therapeutic
role attitude and the mate's evaluation of the spouse's
therapeutic role behaviors. The therapeutic role consists of
supportive behaviors directed towards one's spouse. Twenty-five
couples were recruited from Oregon State University classes.
Attitude questionnaires were administered to all respondents.
The Pearson...
Published September 1981. 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 August 1986. 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
Moored temperature observations were obtained at an array of buoys in the North Atlantic (59° 00.2'-59°10.7'N, 12°27.4'-12°33.6'W) during the Joint Air-Sea Interaction Experiment (JASIN) of 1978. Observations were taken at 10-minute intervals by use of thermistors at 21 depths ranging from 4.5 m to 81.5 m. Plots of temperature as...
Published May 1984. 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 February 1983. 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 May 1984. 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 May 1985. 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 1984. 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 February 1989. 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 April 1988. 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
The purpose of this study was to evaluate the effects
that free ranging cattle have on water quality in semi-arid
environments. There were three specific objectives:
1) To determine the concentration and distribution of
cattle feces in meadows, riparian zones, and the
associated uplands. 2) To determine the fecal deposition...
Infiltration, soil erosion, nitrogen loss and soil profile
characteristics were measured on 36 sites representing land occupied
by Artemisia tridentata ssp. tridentate, wyomingensis, and vaseyana.
Infiltration, soil erosion, and nitrogen loss were strongly correlated
but highly variable. Soil loss, but not infiltration or nitrogen
loss was significantly different between subspecies....
This study was conducted to evaluate government
intervention as an effective strategy for implementing
accident prevention programs and reducing occupational
injuries in the workplace. The central issue was to
determine if participation in the California Occupational
Safety and Health (Cal/OSHA) Small Employer Voluntary
Compliance Program (SEVCP) or compliance inspections
conducted...
Observation shows that bubbles in large particle fluidized beds
behave quite differently from beds of fine particles. They expand and
can grow faster than they rise. Bubbles in fine particle beds seem to
grow primarily by coalescence, while in large particle beds they are
observed to grow mainly without coalescence....
More than 2.3 billion pounds of pesticides with a value of $4.1 billions are applied by farmworkers to agricultural crops each year. These chemicals applied to farm lands lead not only to acute and chronic health effects, they also enter the groundwater and food chain of populations. In recent years...
The purpose of this study was to determine the need
for mathematics inservice training for untrained and
trained teachers in K-7 rural schools in Manicaland,
Zimbabwe. The auxiliary teachers do not have any
professional preparation before entry into the teaching
profession. The study sought to determine the mathematics
areas needed...
The genus Deraeocoris Kirschbaum of western America north of
Mexico was revised. Approximately 10,000 specimens from the Nearctic
Region were examined. Taxonomic characters used by previous authors
were reevaluated. In addition to the male parameres, the male vesica
and the female posterior wall of the bursa copulatrix and sclerotized
rings...
Revised edition of the author's "Vegetation of Oregon and Washington", originally published by the U.S. Forest Service in 1973. Reprinted with new bibliographic supplement by the OSU Press in 1988.
Of great benefit, but not limited to seafloor mineral
exploration, is a technique that fairly rapidly determines the
composition of a drilled vibracore (in a time comparable to the time
involved in obtaining the core). The rapid assessment is desired to
predict whether a given region warrants further exploration by...
Factors influencing pesticide susceptibility and
resistance were studied in Psylla pyricola Foerster, and
its mirid predator, Deraeocoris brevis Knight in the
Rogue River Valley, Oregon. Factors studied were at the
biochemical, life history, and population ecology
levels.
Studies on detoxification enzymes showed that
glutathione S-transferase and cytochrome P-450
monooxygenase activities...
Proceedings of the 63rd Annual Western Orchard Pest and Disease Management Conference, held January 11-13, 1989 at the Imperial Hotel in Portland, Oregon.
Proceedings of the 54th Annual Western Orchard Pest and Disease Management Conference, held January 16-18, 1980 at the Imperial Hotel in Portland, Oregon.
Proceedings of the 62nd Annual Western Orchard Pest and Disease Management Conference, held January 13-15, 1988 at the Imperial Hotel in Portland, Oregon.
A modified slide-dip bioassay was used to survey and establish
baseline resistance levels in Psylla pyricola Foerster from
western Oregon orchards to four pesticides. Orchards selected in the
Hood River, Rogue River and Willamette Valleys spanned a wide range of
environmental and management conditions. During the study period of
1982-1983,...
Proceedings of the 55th Annual Western Orchard Pest and Disease Management Conference, held January 20-22, 1981 at the Imperial Hotel in Portland, Oregon.
Proceedings of the 57th Annual Western Orchard Pest and Disease Management Conference, held January 13-15, 1983 at the Imperial Hotel in Portland, Oregon.
This report includes information concerning experimental use of unregistered pesticides or unregistered uses of pesticides. Experimental results should not be interpreted as recommendations for use. Use of unregistered materials or use of any registered pesticides inconsistent with its label is against both Federal Law and State Law.
The cytolytic properties of the mosquitocidal 25 Kd protein deltaendotoxin of Bacillus thuringiensis subsp. israelensis (Bti) was studied using the human erythrocyte as a target cell. Both a fixedtime and a kinetic hemolytic bioassay were developed in order to screen a variety of treatments for their influence on the toxinerythrocyte...
Eight species of Lathvrus (Fabaceae, Faboideae) endemic to the
Pacific Coast of North America were the subject of a systematic
investigation. Taxa studied included Lathvrus vestitus, Nutt. ex T.
& G., L. laetif lorus Greene, L.. iepsonii Greene, £,. splendens
Kellogg, L. polvphvllus, Nutt. ex T. & G., L. holochlorus...
Rubber-modified asphalt pavements have been used in Sweden and the United States since the 1970's. In these applications ground recycled tire particles (0.25 inch minus) are added to a gap-graded aggregate and then mixed with hot asphalt cement. The benefits of adding rubber to the mix include increased skid resistance...
Twenty-one rice cultivars were evaluated to determine the difference between populations of Sogatodes oryzicola (Muir) (Homoptera: Delphacidae) in Costa Rica and Colombia, Survival, mortality and population development of S. oryzicola on five selected cultivars was used to determine levels of plant resistance. The importance and potential of the parasitoid-predator Haplogonatopus...
Arthropod communities in pear are conceptualized as hierarchically
organized systems in which several levels of organization or subsystems
can be recognized between the species population level and the community
as a whole. An individual tree is taken to be the community habitat with
arthropod subcommunities developing on leaf, fruit and...
Ovipositional behavior of the codling moth, Laspeyresia pomonella (L.), on several varieties of apples and pears grown in the Pacific Northwest was investigated during the spring/summer of 1979. Field studies showed that early in the season more eggs were laid on the Bosc variety than on several other apple and...
Evidence suggests that western juniper
(Juniperus occidentalis) in Central Oregon affects
understory production and composition. As trees
increase in size and density, understory production is
reduced and composition changes. This study was
designed to identify the relationship between
production and composition of understory vegetation
and various tree canopy sizes of...
Freeze/thaw cycles are numerous in agricultural soils of the Pacific Northwest. Potential loss of soil by erosion is high whenever a soil thaws from the surface creating a saturated soil overlying an impermeable frozen layer. Field studies were conducted to investigate the effect of surface residue on soil freezing. Residue...
Published July 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
Dispersal and colonization of young potted apple
trees by the spider-mite predators Metaseiulus
occidentalis Nesbitt and Typhlodromus pyri Scheuten
were studied in the Hood River Valley of Oregon.
Experimental mini-orchards of 10 four-year old potted
apple trees were established at distances of 0, 10, and
100 m downwind from commercial...
Teachers and administrators spend many hours of work reviewing
the State of Oregon Guidelines and drafting district guidelines in an
attempt to make the process of evaluation positive and productive.
Most districts agree the primary purpose of evaluation should be for
the improvement of instruction.
The amended state law, ORS...
This research assessed the effect of western juniper (Junlperus
occldentalls) removal on understory plant production and cover and
ponderosa pine (Pinus ponderosa) growth and plant water status.
A complete randomized block design, with four blocks and four
treatments was established in the summer of 1984 near Prineville,
Oregon. The four...
Published July 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
Implementation of. the Fishery Conservation and Management Act of
1976 affords opportunities for fishery expansion and economic development
in the Oregon otter trawl fishery. The changes stimulated by the
Act should occur, according to social science theorists, by the
diffusion of innovations from innovative fishermen to less innovative
fishermen, with...
Whole tree excavation of 41 western juniper (Juniperus
occidentalis Hook.), ranging in age from 2 to 34 years old,
was used to assess the development and structure of root
systems, to determine biomass allocation patterns, and to
develop mathematical relationships for estimating biomass
and root system dimensions in seedling and...
Published September 1988. 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
The literature cites several examples of investigations made
concerning the size of bubbles rising in small particle fluidized beds
at room temperature. In many practical applications, however, fluidized
beds require the use of large particles at very high temperatures.
Despite this fact, little information has been reported on bubble size...
This study examined the role perceptions of trustees
in the locally controlled Oregon community college system
and the state controlled Washington community college
system. Authorities in the literature were consulted to
define the "ideal trustee role" and the study determined
which governance system was most effective in fostering
this "ideal...
Documentation of the side effects of pesticides on
arthropod natural enemies has expanded rapidly since the
1950's as part of an increase in non-target side effects
literature. Most reviews have been based on empirical
analysis of selected literature. The SELCTV database was
developed to make a larger information base accessible...
Published June 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
This study examined the possible relationship that perception
of parents has in determining the self-concept of
the adult offspring. The literature search revealed that there
has been a lack of studies regarding the adult offspring's
perception of parents. Furthermore, until this study, no
instrument that measures the adult offspring's perception...