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

A model study of a plant-herbivore system

Creator:: Stimac, Jerry Lynn
Abstract:: The dynamics of tansy ragwort, Senecio jacobaea L. , and the cinnabar moth, Tyria jacobaeae (L.) were studied with the aid of a system simulation model. The model development and validation were based on knowledge of the plant and herbivore gathered from the literature, four years of data from previous...
Resource Type:: Dissertation
Full Text:: used to evaluate the potential of cinnabar moth as a biological control of tansy ragwort. Model

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

Classical biological control of the filbert aphid, Myzocallis coryli (Goetze) (Homoptera:Aphididae) in western Oregon

Creator:: Messing, Russell H.
Abstract:: A classical biological control project was undertaken against the filbert aphid, Myzocallis coryli (Goetze), in western Oregon. Hazelnut orchards in Spain, France, and Italy were searched for natural enemies of the aphid, and a parasitic wasp, Trioxys pallidus Haliday, was imported, quarantined, mass-reared, and released in Oregon orchards. The wasp...
Resource Type:: Dissertation
Full Text:: Classical biological control of the filbert aphid

Biological control of spider mites by the predatory mite Neoseiulus fallacis (Acari: Phytoseiidae) in ornamental nursery systems

Creator:: Pratt, Paul D.
Abstract:: We identified and evaluated a phytoseiid predator as a biological control agent of multiple spider mites pests that occur in ornamental nurseries. When comparing species, Neoseiulus fallacis (Garman) had a wider prey range than Galendromus occidentalis (Nesbitt), a higher probability of overwintering than Neoseiulus califomicus McGregor and was equally or...
Resource Type:: Dissertation
Full Text:: Biological control of spider mites by the predatory mite

Seedling recruitment of hairy nightshade and other summer annual weeds in irrigated row crops

Creator:: Peachey, Ronald Edward
Abstract:: This study evaluated the effects of tillage system, rotational tillage sequences, and winter seed burial depth on weed seedling recruitment in irrigated cropping systems. Notill (NT) planting of vegetable crops reduced emergence of hairy nightshade by 77 to 99% and Powell amaranth emergence from 50 to 87% compared to conventional...
Resource Type:: Dissertation
Full Text:: seasonal seedling recruitment so that producers can maximize control by adjusting herbicide rates or

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.)

A model study of a plant-herbivore system

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)

Classical biological control of the filbert aphid, Myzocallis coryli (Goetze) (Homoptera:Aphididae) in western Oregon

Biological control of spider mites by the predatory mite Neoseiulus fallacis (Acari: Phytoseiidae) in ornamental nursery systems

Seedling recruitment of hairy nightshade and other summer annual weeds in irrigated row crops

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