The location of prune dwarf virus (PDV) and Prunus
necrotic ringspot virus (PNRSV) in pollen and seed
from infected and healthy sweet cherry trees pollinated
with infected pollen was investigated. Virus-like
particles were observed in the cytoplasm of pollen
grains from PDV-infected cherry trees using transmission
electron microscopy. No particles...
An outbreak of western spruce budworm Choristoneura
occidentalis in the Blue Mountains of eastern Oregon in
1983 was treated with helicopter applied carbaryl. Effects
of the spraying on forest ants were determined from pre- and
postspray samples taken from two carbaryl sprayed and
two unsprayed plots. In each 0.75-ha plot,...
We describe a general finite-dimensional inner product space setting for studying the characterization of admissible linear estimators. We extend the results of LaMotte (1982) and derive necessary and sufficient conditions for an estimator to be admissible among an arbitrary affine set of linear estimators when they are compared using quadratic...
Research on the topic of learning styles has
revealed the positive impact that implementation of a
learning styles program can have on the education of
America's youth. Yet for many districts in the state
of Oregon, implementation is hindered by a lack of
available funds and personnel trained to do...
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,...
This study compared three nursery handling processes from the time just before lifting to the time seedlings are placed in cold storage after grading, sorting, and packing at the nursery. The seedlings handled in these different ways were compared first in terms of the temperature and plant moisture stresses they...
Benomyl, a systemic benzimidazole fungicide was
incorporated into artificial diet and evaluated for its
oral toxicity to nonparasitized and parasitized third
instar orange tortrix larvae, Argyrotaeniae citrana
(Fernald) and its food chain toxicity via the host to the
solitary braconid endoparasite Apanteles aristoteliae
Vierek.
Concentrations of benomyl ≤ 300 ppm...
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...
In the Pajaro Valley near Watsonville, California,
twospotted spider mite (Tetranychus urticae Koch)
populations were surveyed in 1983 and '84 to detect the
influence of immigrants from nursery plants or
surrounding vegetation on subsequent resistance
development to cyhexatin and formetanate in strawberry
fields. Susceptible mites (cyhexatin LC50 = 0.0039 %...
Published October 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