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Science Takes Flight: Detection of Black Leg on Turnip Gray Mold on Hemp

Creator:: Bates, Taylor A.
Abstract:: Disease detection through traditional techniques such as scouting fields on foot, molecular assays, or morphological identification of plant pathogens is time consuming and costly. Disease diagnosis in the field can be extremely subjective, and largely depends on the experience and knowledge of pathogen identification and disease quantification. This thesis provides...
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________ Cynthia M. Ocamb Disease detection through traditional techniques such as scouting

Responses and relationships among Fusarium species, sweet corn, and western spotted cucumber beetles

Creator:: Miller, Nathan L. (Nathan Louis)
Abstract:: Sweet corn (Zea mays L.) yields in the Willamette Valley of Oregon have been declining since the early 1990’s. Studies were done to determine if there is a relationship between ear weight and several disease parameters including necrotic crowns or stalk nodes, nodal root rot, radicle root rot, and sub-crown...
Resource Type:: Dissertation
Full Text:: Western Spotted Cucumber Beetles. Abstract approved: Cynthia M. Ocamb Sweet corn

Examinations of Fusarium sambucinum on Humulus lupulus and co-infection with hop stunt viroid in commercial hop fields

Creator:: Cerruti, Natasha R.
Abstract:: After an unusually high incidence of Fusarium canker was observed in commercial hop fields of the Pacific Northwest, field surveys were conducted and revealed that canker incidence ranged from 20 to 60% of bines sampled in six commercial fields, as well as wide-spread Hop stunt viroid infection in these six...
Resource Type:: Masters Thesis
Full Text:: Cynthia M. Ocamb After an unusually high incidence of Fusarium canker was observed in

Presence and pathogenicity of Fusarium and Verticillium species in commercial red radish (Raphanus sativus) seed production in the Willamette Valley of Oregon

Creator:: Bomberger, Rachel A.
Abstract:: Commercial radish seed producers in the Willamette Valley of Oregon have observed a late season wilt in their seed fields. Twenty-two fields were surveyed for wilt in the Willamette Valley during June through August 2012 and 2013. Plants exhibiting wilt symptoms were collected from the fields and examined for vascular...
Resource Type:: Masters Thesis
Full Text:: : Cynthia M. Ocamb Commercial radish seed producers in the Willamette Valley of Oregon have observed a

Hop cone tip blight : a new disease in the Pacific Northwest

Creator:: Bienapfl, John C.
Abstract:: A necrosis at the tip of cones was observed on hop (Humulus lupulus), cultivar "Nugget", grown in Oregon in the early 1990's. Fusarium sambucinum and F. avenaceum were recovered from symptomatic cones in 1998 and preliminary inoculation experiments suggested both Fusarium species could cause hop cone necrosis. Studies were carried...
Resource Type:: Masters Thesis
Full Text:: Blight: A New Disease in the Pacific Northwest Abstract approved: Cynthia M. Ocamb A necrosis at the

Addressing the relationship between Pseudoperonospora cubensis and P. humuli using phylogenetic analyses and host specificity assays

Creator:: Mitchell, Melanie N.
Abstract:: The two most economically important plant pathogens in the Pseudoperonospora (Peronosporaceae) genus are P. cubensis, causal agent of cucurbit downy mildew, and P. humuli, causal agent of hop downy mildew. These organisms have been shown to be very closely related phylogenetically and morphologically. In 2005, researchers in Korea proposed that...
Resource Type:: Masters Thesis
Full Text:: : _____________________________________________________________________ David. H. Gent Cynthia M. Ocamb The two most economically important plant pathogens in

Investigations of Black Leg and Light Leaf Spot on Brassicaceae Hosts in Oregon

Creator:: Claassen, Briana J.
Abstract:: The Pacific Northwest is an internationally important region for the production of Brassica seed and other seed crops including grass seed. Oregon lawmakers mandated research into the co-existence of canola (Brassica napus) with other Brassica production in the Willamette Valley and House Bill 2427 was signed into law in 2013,...
Resource Type:: Masters Thesis
Full Text:: Cynthia M. Ocamb Carol A. Mallory-Smith The Pacific Northwest is

Identification and distribution of the mating-type locus and development of cleistothecia of Podosphaera macularis

Creator:: Wolfenbarger, Sierra N.
Abstract:: Podosphaera macularis, causal agent of hop powdery mildew, is known to produce cleistothecia (syn. chasmothecia) in eastern North America and Europe, but ascocarps are not reported from the Pacific Northwestern region of North America. Reasons for the apparent absence of cleistothecia in the Pacific Northwest are unknown. We established that...
Resource Type:: Masters Thesis
Full Text:: Northwest until 1997 (Ocamb et al., 1999). Hop powdery mildew was first observed in the Pacific

Growth properties of induced mutants of the common wheat-bunt fungus, Tilletia caries, in axenic culture and in planta

Creator:: Churchill, Alice Cynthia Louise
Abstract:: Genetic studies of Tilletia spp. have been hampered by the lack of genetic markers. The work discussed here is a first report of the isolation of genetically marked strains of J. caries and their use in wheat plant infection studies. Procedures for the isolation of auxotrophic and drug-resistant mutants in...
Resource Type:: Masters Thesis
Full Text:: Wheat-Bunt Fungus, Tilletia caries, in Axenic Culture and In Planta by Alice Cynthia Louise Churchill

Diseases of Rhododendron and Boxwood: Survey and Virulence of Phytophthora Root Rot and Management of Boxwood Blight with Systemic Fungicides

Creator:: Sacher, Gabriel
Abstract:: Diseases can be a substantial threat to woody plant production, a major industry in Oregon. Boxwood (Buxus spp.) and rhododendron (Rhododendron subgenus Rhododendron and Hymenanthes) represent the top two broadleaf evergreen woody plants by farmgate value in Oregon. Historically, Phytophthora root rot has been considered the most destructive disease of...
Resource Type:: Dissertation
Full Text:: first report (Pscheidt and Ocamb 2023; Reeser et al. 2015b). In heavily infested fields ≥50% of

ScholarsArchive@OSU

Science Takes Flight: Detection of Black Leg on Turnip Gray Mold on Hemp

Responses and relationships among Fusarium species, sweet corn, and western spotted cucumber beetles

Examinations of Fusarium sambucinum on Humulus lupulus and co-infection with hop stunt viroid in commercial hop fields

Presence and pathogenicity of Fusarium and Verticillium species in commercial red radish (Raphanus sativus) seed production in the Willamette Valley of Oregon

Hop cone tip blight : a new disease in the Pacific Northwest

Addressing the relationship between Pseudoperonospora cubensis and P. humuli using phylogenetic analyses and host specificity assays

Investigations of Black Leg and Light Leaf Spot on Brassicaceae Hosts in Oregon

Identification and distribution of the mating-type locus and development of cleistothecia of Podosphaera macularis

Growth properties of induced mutants of the common wheat-bunt fungus, Tilletia caries, in axenic culture and in planta

Diseases of Rhododendron and Boxwood: Survey and Virulence of Phytophthora Root Rot and Management of Boxwood Blight with Systemic Fungicides

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