Index Catalog // ScholarsArchive@OSU

Big-eyed bugs as predators of the green peach aphid

Creator:: Puls, Karl A.
Resource Type:: Masters Thesis
Full Text:: the early periods of these aphid life stages represent the greatest potential for biological control

Studies of the biology and effectiveness of Laricobius erichsonii Rosenh. (Coleoptera: Derodontidae), an European predator of the balsam woolly aphid, Adelges piceae (Ratz.) (Homoptera: Adelgidae)

Creator:: Buffam, Paul Edwin
Abstract:: The balsam woolly aphid (Adelges piceae (Ratz)), an European pest of conifers, was first discovered in the Pacific Northwest shortly after 1930. Control measures of a chemical, silvicultural, or biological nature have been proposed. However, present control methods are either too costly or do not result in satisfactory control of...
Resource Type:: Masters Thesis

Seed depth influence on position of the growing point and chemical control of wild proso Millet (Panicum miliaceum L.)

Creator:: Fernandez Mendez, Raquel J.
Abstract:: Wild proso millet (Panicum miliaceum L.) is a serious weed recently infesting sweet corn fields in the Willamette Valley of western Oregon. Field and greenhouse experiments were conducted to determine the importance of seed depth in the position of the growing point of wild proso millet seedlings and in the...
Resource Type:: Masters Thesis
Full Text:: chemical control of wild proso Millet (Panicum miliaceum L.) AN ABSTRACT OF THE THESIS OF Raquel J

Adequacy of hand-defoliation of tansy ragwort (Senecio jacobaea L.) as a simulation of defoliation by cinnabar moth (Tyria jacobaeae (L.))

Creator:: Henneberger, Diane
Abstract:: Hand-defoliation was evaluated for its ability to simulate herbivory by cinnabar moth larvae, Tyria jacobaeae (L.) (Arctiidae) on the weed tansy ragwort, Senecio jacobaea L. (Asteraceae). The evaluation was done on a field population of flowering ragwort, for three different timings (early, middle, and late season) of damage. In the...
Resource Type:: Masters Thesis
Full Text:: ). The study reported here arose as part of an investigation of biological control of ragwort by the

Trichoderma spp. : distribution in stumps infested with Phellinus weirii and growth and antagonism in vitro

Creator:: Goldfarb, Barry
Abstract:: 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...
Resource Type:: Masters Thesis
Full Text:: invaders of P. weirii-infested stumps and stump roots, and to identify some biological and environmental

Prey consumption, survivorship and oviposition by adults of the bark beetle predator Thanasimus dubius Fabricius (Coleoptera:Cleridae)

Creator:: Turnbow, Robert Harold
Abstract:: Laboratory studies were conducted to evaluate the effects of prey availability on prey consumption, survivorship and oviposition of the southern pine beetle predator, Thanasimus dubius Fabricius. Although prey consumption rates were significantly affected by the sex, size and ovipositional status of the predator, it was found through correlation analyses that...
Resource Type:: Masters Thesis
Full Text:: - studies have focused on biological control agents. The roles of predators and parasites have received

Biochemical studies on the mosquitocidal delta endotoxin of Bacillus thuringiensis subsp. israelensis

Creator:: Pollock, Martin L.
Abstract:: 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...
Resource Type:: Masters Thesis
Full Text:: 7 control (Figures 8 to 12). There was a definite reduction in biological activity at pH 5 and pH

Enhancement of biological control with beneficial insectary plantings

Creator:: Colley, Micaela Ruth
Abstract:: Five field experiments were conducted to evaluate the relative attractiveness of potential beneficial insectary plants to aphidophagous hover flies and parasitic Hymenoptera and the effectiveness of interplanting selected flowering plants in a broccoli field to enhance biocontrol of the cabbage aphid and green peach aphid. In 1996 we established a...
Resource Type:: Masters Thesis
Full Text:: plots with alyssum than in cilantro or control plots. However, no differences in aphid intensities

Environmental controls on the capacity of tansy ragwort (Senecio jacobaea L.) to compensate for defoliation by cinnabar moth (Tyria jacobaeae L.)

Creator:: Cox, Caroline Shipley
Abstract:: To assess the effect of summer moisture stress on the capacity of tansy ragwort (Senecio jacobaea L.) to compensate for defoliation by the cinnabar moth (Tyria jacobaeae LT7), the performance of plants grown under different irrigation regimes was measured. The proportion of plants producing new leaves following defoliation, the number...
Resource Type:: Masters Thesis

Potential of Trichoderma sp. for inhibition of Botrytis cinerea and Sclerotinia sclerotiorum on snap beans

Creator:: Nelson, Mark E.
Abstract:: Isolates of Trichoderma spp. collected from snap bean foliage were tested for inhibition of grey mold of snap beans caused by Botrytis cinerea. In a detached blossom-pod assay an isolate of Trichoderma hamatum reduced pod rot by 94% compared to the nontreated check. Control was comparable to that obtained with...
Resource Type:: Masters Thesis
Full Text:: encountered with registration of fungicidal compounds has resulted in an interest in biological control

ScholarsArchive@OSU

Big-eyed bugs as predators of the green peach aphid

Studies of the biology and effectiveness of Laricobius erichsonii Rosenh. (Coleoptera: Derodontidae), an European predator of the balsam woolly aphid, Adelges piceae (Ratz.) (Homoptera: Adelgidae)

Seed depth influence on position of the growing point and chemical control of wild proso Millet (Panicum miliaceum L.)

Adequacy of hand-defoliation of tansy ragwort (Senecio jacobaea L.) as a simulation of defoliation by cinnabar moth (Tyria jacobaeae (L.))

Trichoderma spp. : distribution in stumps infested with Phellinus weirii and growth and antagonism in vitro

Prey consumption, survivorship and oviposition by adults of the bark beetle predator Thanasimus dubius Fabricius (Coleoptera:Cleridae)

Biochemical studies on the mosquitocidal delta endotoxin of Bacillus thuringiensis subsp. israelensis

Enhancement of biological control with beneficial insectary plantings

Environmental controls on the capacity of tansy ragwort (Senecio jacobaea L.) to compensate for defoliation by cinnabar moth (Tyria jacobaeae L.)

Potential of Trichoderma sp. for inhibition of Botrytis cinerea and Sclerotinia sclerotiorum on snap beans

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