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Mechanisms of resistance in broccoli, Brassica oleracea italica to the garden symphylan, Scutigerella immaculata (Newport)

Creator:: Simagrai, Montri
Abstract:: Studies were conducted on the mechanisms contributing to resistance in broccoli, Brassica oleracea italica, to the garden symphylan, Scutigerella immaculata (Newport). Differences in resistance to symphylan injury were shown between five selected broccoli cultivars. The hybrid cultivars, Crusader, Green Duke and Bravo, showed a higher level of resistance to symphylans...
Resource Type:: Masters Thesis
Full Text:: been grown successfully. Included in the report of Insect-Pest Management and Control (1969), were

Labops hesperius Uhler : biology and impact of Oregon rangelands (Hemiptera: Miridae)

Creator:: Todd, James Gordon
Abstract:: The seasonal development and habits of Labops hesperius Uhler were studied in rangeland seeded to intermediate wheatgrass (Agropyron intermediurn (Host) Beauv. ) in Baker County, Oregon, The first nymphs appeared on March 22, and required about one week to complete each of the five nymphal stadia. Most small nymphs stayed...
Resource Type:: Masters Thesis
Full Text:: ) Title: LABOPS HESPERIUS UHLER: BIOLOGY AND IMPACT IN OREGON RANGELANDS (HEMIPTERA: MIRIDAE) Abstract

Seasonal distribution, sex attractants, and applied biology of the strawberry crown moth, Synanthedon bibionipennis (Boisduval), in Oregon (Lepidoptera:Sesiidae)

Creator:: Wilmot, Thomas Ray
Resource Type:: Masters Thesis
Full Text:: a serious pest of cultivated strawberries, Fragaria x ananassa Duch., and blackcap rasp- berries

Mechanisms of hop resistance to the twospotted spider mite (Tetranychus urticae Koch)

Creator:: Peters, Kay Myra
Abstract:: Hop varieties were compared under field and greenhouse conditions to determine their relative susceptibility to the twospotted spider mite, Tetranychus urticac Koch. A fertility schedule was prepared for mites on resistant and susceptible varieties, and tests were conducted to compare sex ratio, oviposition rate, survival rate, and developmental rate of...
Resource Type:: Masters Thesis
Full Text:: behavior; (2) antibiosis, a plant's adverse effect on the growth or survival of a pest; and (3) tolerance

Sampling and estimating populations of insect seed-predators in coniferous forests

Creator:: Russell, Malcolm Howard
Resource Type:: Masters Thesis
Full Text:: Sampling and estimating populations of insect seed

Population dynamics of the Douglas-fir cone moth, Barbara colfaciana (Kft.) (Lepidoptera:Olethreutidae)

Creator:: Nebeker, T. Evan
Abstract:: A population of the Douglas-fir cone moth, Barbara colfaxiana (Kft. ), was studied on the Buckhead Seed Production Area, Oakridge, Oregon, during 1971 and 1972. A method of estimating cone and insect populations is presented. Factors contributing to the mortality of B. colfaxiana are discussed, with resinosis being the critical...
Resource Type:: Dissertation
Full Text:: by an un- identified disease. The larvae were black and the body cavity was filled with a fluid

The parasite complex of the pea aphid, Acyrthosiphon pisum (Harris) on alfalfa in western Oregon

Creator:: Dickie, Alfred Gordon
Abstract:: This study was initiated in the Spring of 1966 for the purpose of determining the present status and effectiveness of imported parasitic wasps of the pea aphid in the Willamette Valley of western Oregon. The pea aphid is a serious pest throughout the pea and alfalfa growing regions of the...
Resource Type:: Masters Thesis
Full Text:: pest throughout the pea and alfalfa growing sections of the United States and Canada. Plants attacked

Aphid age and in-vector virus concentration as factors influencing pea enation mosaic virus transmission by the pea aphid

Creator:: Suharto, Hendarsih
Abstract:: The relationship between pea enation mosaic virus (PEMV) and aging pea aphids was studied. Although this research initially emphasized the relationship between the decline in the rate of PEMV transmission and the 'concentration of PEMV within pea aphids, aphid age was found to be the principle factor influencing transmission. Enzymelinked...
Resource Type:: Masters Thesis
Full Text:: virus disease of garden pea (Pisum sativum L.), and several other leguminous plants. It is transmitted

Chalk brood disease in the leafcutting bee

Creator:: Stephen, W. P., Undurraga O., Jaime M., and Oregon State University. Agricultural Experiment Station
Abstract:: Published January 1978. 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
Resource Type:: Technical Report
Full Text:: response in reducing the in- cidence of the disease and we do not recommend their use. Surface

Parasites and predators of Dendroctonus ponderosae Hopkins (Coleoptera : Scolytidae) in ponderosa pine

Creator:: Billings, Ronald F.
Abstract:: The bark beetle Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae) has caused severe mortality in recent decades to young stands of ponderosa pine in the western United States. Insect parasites and predators, believed to be of importance in the population dynamics of the beetle, were the subject of the thesis research, conducted...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Mechanisms of resistance in broccoli, Brassica oleracea italica to the garden symphylan, Scutigerella immaculata (Newport)

Labops hesperius Uhler : biology and impact of Oregon rangelands (Hemiptera: Miridae)

Seasonal distribution, sex attractants, and applied biology of the strawberry crown moth, Synanthedon bibionipennis (Boisduval), in Oregon (Lepidoptera:Sesiidae)

Mechanisms of hop resistance to the twospotted spider mite (Tetranychus urticae Koch)

Sampling and estimating populations of insect seed-predators in coniferous forests

Population dynamics of the Douglas-fir cone moth, Barbara colfaciana (Kft.) (Lepidoptera:Olethreutidae)

The parasite complex of the pea aphid, Acyrthosiphon pisum (Harris) on alfalfa in western Oregon

Aphid age and in-vector virus concentration as factors influencing pea enation mosaic virus transmission by the pea aphid

Chalk brood disease in the leafcutting bee

Parasites and predators of Dendroctonus ponderosae Hopkins (Coleoptera : Scolytidae) in ponderosa pine

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