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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

Mold Management in Snap Bean : Report to the Agricultural Research Foundation for the Oregon Processed Vegetable Commission, December 2012

Creator:: Ocamb, Cynthia M.
Abstract:: Sclerotinia sclerotiorum (causal agent of white mold) can cause serious economic losses in snap bean production as well as many other crops. Spores are produced in apothecia (mushroom-like structures) that develop from over-wintering sclerotia in the soil. Sclerotia are long-lived, durable hyphal survival structures produced by the fungus and they...
Resource Type:: Technical Report
Full Text:: in Snap Bean Principal Investigator: Cynthia M. Ocamb, Ext. Specialist & Associate Professor

Sweet corn diseases and their management in the PNW : Seed treatment evaluations and development of Fusarium-free seed : Report to the Agricultural Research Foundation for the Oregon Processed Vegetable Commission, December 2013

Creator:: Ocamb, Cynthia M.
Abstract:: Sweet corn is susceptible to various pathogenic Fusarium species and has been long known to be subject to early season diseases of seed rot and seedling blight as well as root rot and later season problems with stalk rot and ear rots. More recently, fields in the Willamette Valley of...
Resource Type:: Technical Report
Full Text:: Principal Investigator: Cynthia M. Ocamb, Ext. Specialist & Associate Professor Botany and Plant Pathology

Detection of Plasmodiophora brassicae (causal agent of Clubroot) in vegetable production fields of the Pacific Northwest : Report to the Agricultural Research Foundation for the Oregon Processed Vegetable Commission, December 2013

Creator:: Ocamb, Cynthia M.
Abstract:: Clubroot, caused by Plasmodiophora brassicae, affects all species of the Crucifer family, including wild mustard. It is a fungus-like microorganism that can persist in soil in the form of durable resting spores for 18 years or longer after an infected crop. These resting spores can be spread through any means...
Resource Type:: Technical Report
Full Text:: fields of the Pacific Northwest Principal Investigator: Cynthia M. Ocamb, Ext. Specialist & Associate

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

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

Mold Management in Snap Bean : Report to the Agricultural Research Foundation for the Oregon Processed Vegetable Commission, December 2012

Sweet corn diseases and their management in the PNW : Seed treatment evaluations and development of Fusarium-free seed : Report to the Agricultural Research Foundation for the Oregon Processed Vegetable Commission, December 2013

Detection of Plasmodiophora brassicae (causal agent of Clubroot) in vegetable production fields of the Pacific Northwest : Report to the Agricultural Research Foundation for the Oregon Processed Vegetable Commission, December 2013

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

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