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Monitoring pesticide resistance in Psylla pyricola Foerster from western Oregon pear orchards

Creator:: Follett, Peter A.
Abstract:: 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,...
Resource Type:: Masters Thesis
Full Text:: Acknowledgements I would first like to thank Dr. Brian Croft for providing me with momentum, support and

The influence of nitrogen in extending the grazing season of four grass species

Creator:: Crofts, Frank Clement
Resource Type:: Masters Thesis
Full Text:: . After botanical separation, the sub-samples were dried at 87° C. for 2L hours and weit;hed, The dry

Biological control of spider mites (Acari: Tetranychidae) on grape emphasizing regional aspects

Creator:: Prischmann, Deirdre A.
Abstract:: During summer of 1998 and 1999, 34 and 10 vineyard sites, respectively, were sampled to assess spider mite pests and associated biological control by phytoseiid mites. Vineyards studied spanned five major valleys in western Oregon where grape production occurs. Leaf samples were taken from site perimeters and centers. One leaf...
Resource Type:: Masters Thesis
Full Text:: per day at 25°C (MacRae and Croft 1993). Predator-prey proportions, or ratios, are often used to

Monitoring insecticide resistance of the western tentiform leafminer Phyllonorycter elmaella (Doganlar and Mutuura) (Lepidoptera: Gracillariidae) in northern Oregon

Creator:: Shearer, Peter W.
Resource Type:: Masters Thesis
Full Text:: critical for reliable assay results and were standardized at 15.6 °C, 60% RH, and a light-dark cycle of

The SELCTV database : the susceptibility of arthropod natural enemies to agricultural pests to pesticides

Creator:: Theiling, Karen M.
Abstract:: 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...
Resource Type:: Masters Thesis
Full Text:: literature base of at least 2000 publications (Croft, personal communication). Studies of pesticide side

Within and between plant dispersal and distributions of adult females and immatures of Neoseiulus californicus and N. fallacis (Acari: Phytoseiidae) in bean and apple plant systems

Creator:: Pratt, Paul D. (Paul David), 1970-
Abstract:: Intra- and interplant movement and dispersal of the predator mites Neoseiulus californicus (McGregor) and Neoseiulus fallacis (Garman) were studied on both lima bean (Phaseolus lunatus L.) and apple (Malus pumila Miller) branch plant systems that were seeded with excess numbers of the spider mite Tetranychus urticae Koch. Individuals of either...
Resource Type:: Masters Thesis
Full Text:: and Apple Plant Systems. Abstract approval: Brian A. Croft Intra- and interplant movement and

Chemotherapeutic and nontarget side-effects of benomyl to the orange tortrix (Argyrotaenia citrana) and the braconid endoparasite Apanteles aristotelia

Creator:: Sewall, David K.
Abstract:: 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...
Resource Type:: Masters Thesis
Full Text:: on the temperature. Although development will occur at extremes of 7.2°C (44.9°F) and 29.4°C (84.9

Jerking behavior among phytoseiid mite species (Acari: Phytoseiidae)

Creator:: Blackwood, J. Scott
Abstract:: Jerking, which we defined as a pronounced and often repeated lunging of the entire body, was studied in larvae among seven species of phytoseiid mites, and in the nymphal stages of Neoseiulus fallacis (Garman). This behavior was observed in all active immature stages of N. fallacis, and in larvae of...
Resource Type:: Masters Thesis
Full Text:: : Phytoseiidae). Abstract approved: Brian A. Croft Jerking, which we defined as a pronounced and often

Effects of early season immigration on acaricide resistance of Tetranychus urticae Koch on strawberry in the California Pajaro and Salinas valleys

Creator:: Miller, Richard W. (Richard William), 1958-
Abstract:: 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 %...
Resource Type:: Masters Thesis
Full Text:: privacy Brian A. Croft In the Pajaro Valley near Watsonville, California, twospotted spider mite

Characteristics of Typhlodromus americanus Chant and Yoshida-Shaul (Acari: phytoseiidae) as a biological control agent of Oligonychus ununguis (Jacobi) (Acari: tetranychidae)

Creator:: Horton, Rene N.
Abstract:: 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...
Resource Type:: Masters Thesis
Full Text:: humidity (LH50) at a temperature of 26°C (Croft et. al. 1993). Egg mortality was determined by egg

ScholarsArchive@OSU

Monitoring pesticide resistance in Psylla pyricola Foerster from western Oregon pear orchards

The influence of nitrogen in extending the grazing season of four grass species

Biological control of spider mites (Acari: Tetranychidae) on grape emphasizing regional aspects

Monitoring insecticide resistance of the western tentiform leafminer Phyllonorycter elmaella (Doganlar and Mutuura) (Lepidoptera: Gracillariidae) in northern Oregon

The SELCTV database : the susceptibility of arthropod natural enemies to agricultural pests to pesticides

Within and between plant dispersal and distributions of adult females and immatures of Neoseiulus californicus and N. fallacis (Acari: Phytoseiidae) in bean and apple plant systems

Chemotherapeutic and nontarget side-effects of benomyl to the orange tortrix (Argyrotaenia citrana) and the braconid endoparasite Apanteles aristotelia

Jerking behavior among phytoseiid mite species (Acari: Phytoseiidae)

Effects of early season immigration on acaricide resistance of Tetranychus urticae Koch on strawberry in the California Pajaro and Salinas valleys

Characteristics of Typhlodromus americanus Chant and Yoshida-Shaul (Acari: phytoseiidae) as a biological control agent of Oligonychus ununguis (Jacobi) (Acari: tetranychidae)

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