The life history, temperature, humidity, and feeding requirements of the
phytoseiid predator mite, Typhlodromus americanus Chant and Yoshida-Shaul were
tested in the laboratory. Occurance of the mite in the field during different times of the
year was investigated as well. Effects of temperature and humidity on egg hatch, the
feeding...
The purpose of this research is two fold. First to improve pest management of the
sciarid fly (Diptera: Sciaridae) by better defining its relation to mushroom production.
Secondly, to explore some of the factors and aspects of the biology of the fly which may
increase room to room dispersal rates...
Four sampling techniques were evaluated to estimate clover aphid, Nearctaphis bakeri
(Cowen), abundance in red clover fields in the Willamette Valley. The Berlese funnel method
detected one to four times more aphids than other sampling techniques. Visual assessment
often underestimated the high aphid densities during the flowering and seeding of...
Peppermint, Mentha piperita 'Black Mitcham' was established as a host for tomato
spotted wilt virus-impatiens serotype (TSWV-I). TSWV-I infection of peppermint,
initially observed in a research greenhouse (Corvallis, OR), included stunting and
downward curling of leaves accompanied by bronzing, and occasionally tip necrosis.
Young leaves appeared either symptomless, deformed, or...
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...
Studies were conducted to examine the effects of feeding
injury by the twospotted spider mite (Tetranychus urticae
Koch) on physiological processes of its host plant, peppermint
(Mentha piperita L.). Aspects of mite-induced host plant
physiological stress that were studied included: 1) effects of
injury on plant-water relations; 2) photosynthesis and...
Ninety-two physicians from six different medical specialty
areas were participants in an opinion survey concerning corporate
executive fitness. The survey was comprised of 21 statements
related to such areas as fitness, nutrition, implementation
of specific programs and cost effectiveness. Descriptive
research methods were utilized to analyze results.
Physicians surveyed were...
Many studies suggest that weedy plant species are most successful when
soil nitrogen in abundant. Consequently, I used soil nitrogen manipulations to
determine if altering nitrogen would affect the establishment of both weedy and
native plant species in a western Oregon wetland prairie. In two studies, we
added carbon amendments...