Index Catalog // ScholarsArchive@OSU

Impact of insects on seed production in a Douglas-fir seed orchard in Oregon

Creator:: Dombrosky, Scott A.
Abstract:: The impact of various factors on seed production in a Douglas-fir (Pseudotsuga menziesii) seed orchard in western Oregon was examined by monitoring the fate of seeds in thirty cones, stratified into three crown levels, on each of ten trees during the 1984 growing season. Cones were examined monthly between April...
Resource Type:: Masters Thesis
Full Text:: populations. Prediction is essential to development of an integrated pest management program for cone and

Status, distribution and seasonal variation of filbert aphid resistance to selected insecticides in the Willamette Valley, Oregon

Creator:: Katundu, Juma
Abstract:: Levels of resistance to six selected insecticides of eleven field populations of the filbert aphid Mvzocallis coryli (Goetze) were determined by using the leaf-dip residue technique. Test insecticides included compounds widely used in commercial filbert orchards, namely, carbaryl, diazinon, endosulfan, phosalone, fenvalerate and oxydemetonmethyl. Aphid samples were collected within a...
Resource Type:: Masters Thesis
Full Text:: levels of insecticide exposure, age and management conditions. The tests were conducted to detect

The biology and seasonality of the parasitiod Trioxys pallidus Haliday in western Oregon

Creator:: Cohn, Judy L.
Abstract:: Seasonal synchrony between the filbert aphid, Myzocallis coryli (Goetze) and its newly introduced parasitoid Trioxys pallidus Haliday was examined in the field to evaluate the effectiveness of parasitoid based biological control in filbert orchards of Oregon. Fieldemergence observations showed that 50% eclosion of the aphid occurred 14 days before that...
Resource Type:: Masters Thesis
Full Text:: a total of 2,645 adult and 1,900 mummy T. pallidus were released in western Oregon filbert orchards

Toxicity of some commonly used pesticides to Trioxys Pallidus and its establishment in filbert orchards of Willamette Valley

Creator:: Saeed, Mohammad
Abstract:: A parasitic wasp, Trioxys pallidus Haliday (Hymenoptera: Aphidiidae) was imported from Europe and initially released against the filbert aphid Mvzocallis coryli (Goetze) in hazelnut (filbert) orchards of the Willamette Valley, Oregon beginning in 1984. In the present study, I investigated the establishment rates of this parasitoid. A total of 13...
Resource Type:: Masters Thesis
Full Text:: growth and adversely affect yields. At present, the Insect Pest Management (IPM) program on filberts

An evaluation of field methods of disease assessment in wheat (Triticum aestivum) for stripe rust (Puccinia striiformis)

Creator:: Mork, Colleen C.
Abstract:: The need to identify a simple but accurate method of stripe rust assessment that best predicts host response prompted this investigation. The study was divided into two plot types, one protected with the fungicide Bayleton and the other unprotected. Ten winter wheat cultivars were used and evaluated. Grain yield, test...
Resource Type:: Masters Thesis
Full Text:: conservation of management time and costs and the monitoring of disease over large areas. Some computerized

Distribution of Acremonium coenophialum in developing seedlings and inflorescences of Festuca arundinacea

Creator:: Cook, Kathy L.
Abstract:: Acremonium coenophialum is an endophytic fungus which infects the reproductive and vegetative tissue of tall fescue. Interest in this fungus was sparked by research which linked its presence in tall fescue with reduced weight gains and alkaloid-like poisoning in cattle. Incomplete information was available on the endophyte's life or disease...
Resource Type:: Masters Thesis
Full Text:: , and to its tolerance of poor grazing management. Although tall fescue has these favorable qualities

The biology of the predator complex of the filbert aphid, Myzocallis coryli (Goetze), in western Oregon

Creator:: Messing, Russell H.
Abstract:: Commercial filbert orchards throughout the Willamette Valley were surveyed for natural enemies of the filbert aphid, Myzocallis coryli (Goetze). A large number of predaceous insects were found to prey upon M. coryli, particularly members of the families Coccinellidae, Miridae, Chrysopidae, Hemerobiidae, and Syrphidae. Also, a parasitic Hymenopteran (Mesidiopsis sp.) and...
Resource Type:: Masters Thesis
Full Text:: location, condition, and management of each orchard. Castillo Orchard: The Castillo orchard is located

The biology and control of Phytophthora root and stem rot of apple rootstocks from stool beds

Creator:: Tidball, Carolyn Jean
Abstract:: The present studies were conducted to better understand the etiology, epidemiology and potential control of the Phytophthora stem root rot as it occurs in apple stool beds. Symptoms of Phytophthora root and stem rot occurred as early as May and continued to develop throughout the growing season. Sunken brown-black lesions...
Resource Type:: Masters Thesis
Full Text:: Disease Ratings 12 Statistical Methods 13 RESULTS 14 Disease Description and Phytophthora Recovery 14

Population dynamics, distribution, and control of nematodes in highbush blueberries

Creator:: Schroeder, Jan-Marie
Abstract:: Fluctuations in population density of Pratylenchus sp., Trichodorus sp., and Xiphinema americanum s. 1. in three blueberry fields were determined monthly for one year. Pratylenchus densities were greatest in August and least in October. Three distinct periods of population growth occurred; during January, April, and between June and August. Trichodorus...
Resource Type:: Masters Thesis
Full Text:: in western Oregon, and 800 acres in western Washington. Commercial production of blueberries is a

Response of winter wheat (Triticum aestivum L. Em. Thell) to nitrogen and chloride fertilization in the presence of take-all root rot (Gaeumannomyces graminis var. tritici Walker)

Creator:: Maatougui, Mohamed El Hadi
Abstract:: Response from nitrogen and chloride fertilization was measured in field experiments on winter wheat (Triticum aestivum L. Em. Thell. var. 'Stephens' and 'Yamhill') grown in western Oregon in an environment with a range of susceptibility to take-all root rot (Gaumannomyces graminis var. tritici Walker). Cropping sequences and expected disease severity...
Resource Type:: Masters Thesis
Full Text:: wheat (Triticum aestivun L. En. Thell. var. 'Stephens' and 'Yamhill') grown in western Oregon in an

ScholarsArchive@OSU

Impact of insects on seed production in a Douglas-fir seed orchard in Oregon

Status, distribution and seasonal variation of filbert aphid resistance to selected insecticides in the Willamette Valley, Oregon

The biology and seasonality of the parasitiod Trioxys pallidus Haliday in western Oregon

Toxicity of some commonly used pesticides to Trioxys Pallidus and its establishment in filbert orchards of Willamette Valley

An evaluation of field methods of disease assessment in wheat (Triticum aestivum) for stripe rust (Puccinia striiformis)

Distribution of Acremonium coenophialum in developing seedlings and inflorescences of Festuca arundinacea

The biology of the predator complex of the filbert aphid, Myzocallis coryli (Goetze), in western Oregon

The biology and control of Phytophthora root and stem rot of apple rootstocks from stool beds

Population dynamics, distribution, and control of nematodes in highbush blueberries

Response of winter wheat (Triticum aestivum L. Em. Thell) to nitrogen and chloride fertilization in the presence of take-all root rot (Gaeumannomyces graminis var. tritici Walker)

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