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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:: Hop varieties were compared under field and greenhouse conditions to determine their relative

Resistance in hops to systemic rootstock and crown infection by downy mildew

Creator:: Skoe, Donald Edward
Resource Type:: Masters Thesis
Full Text:: lines and new varieties of hops produced in the hop breeding and selec- tion program at Oregon State

Evaluation of assay systems for the determination of susceptibility of the hop (Humulus lupulus) to Verticillium wilt caused by Verticillium dahliae

Creator:: Shufelt, Eileen Marie
Abstract:: A rapid and reliable assay is needed to evaluate hop resistance to Verticillium wilt caused by Verticillium dahliae. Assays used in the past are laborious, require long incubation periods, and usually produce mild symptoms which are difficult to evaluate and are often not consistent. A study comparing several methods for...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: Dr. Robert G. Linderman A rapid and reliable assay is needed to evaluate hop

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:: canker disease was initially observed in European hop fields and first described in 1902, but was likely

Understanding sporulation and dissemination of Podosphaera macularis, hop powdery mildew

Creator:: Peetz, Amy B.
Abstract:: Podosphaera macularis causes one of the most important diseases, powdery mildew, of Humulus lupulus (hop). If left unmanaged, hop powdery mildew can cause total crop loss due to disease or browning of hop cones rendering the cones unmarketable to buyers. The Hop Powdery Mildew Infection Risk Index (HOPS) is heavily...
Resource Type:: Masters Thesis
Full Text:: July 23, 2007. Title: Understanding Sporulation and Dissemination of Podosphaera macularis, Hop

Verticillium wilt, nematodes, and soil fertility interactions in hop yards

Creator:: Barth, Alexander W.
Abstract:: Verticillium wilt of 'Willamette' hops (Humulus lupulus) was investigated to identifY the causal organism, to determine the incidence of the disease, and to explore the possibility of interactions with soil fertility and/or nematodes. In the first year of a three year study, sampling of yards followed a "searching for extremes...
Resource Type:: Masters Thesis
Full Text:: nutrient solutions on hop wilt. Although they found a reduction in disease severity in N, P, and K

Powdery mildew (Podosphaera macularis Braun & Takamatsu) resistance in wild hop genetic resources

Creator:: Smith, Jodi M.
Abstract:: Hop powdery mildew, caused by Podosphaera macularis Braun & Takamatsu (formerly Sphaerotheca macularis (Wallr. :Fr.) Lind, syn. S. humuli (DC.)Burrill) was not observed in Pacific Northwest hop yards until 1997, when it was discovered in Washington. Within one year, it had spread to Oregon and Idaho. This emerging disease caused...
Resource Type:: Masters Thesis

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:: and a significant decrease in cone yields. This stunting disease was described as hop stunt in 1973

Tactics for enhancing conservation biological control of twospotted spider mites, Tetranychus urticae Koch, in Pacific Northwest hop yards

Creator:: Woods, Joanna L.
Abstract:: The twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is a worldwide pest of numerous agronomic and horticultural plants. Conservation biological control of this pest can be unreliable due to asynchrony of natural enemies and certain horticultural practices that have a direct or indirect affect on natural enemies and the...
Resource Type:: Masters Thesis
Full Text:: between hop rows and pest and predator levels were assessed on the hop plants over three growing

Biology of Meligethes seminulum lec. (Coleoptera: Nitidulidae)

Creator:: Dickason, E. A. (Elvis Arnie), 1919-
Resource Type:: Masters Thesis
Full Text:: - ported as an economic pest because it destroys the flowers of cruciferous and uinbelliferous plants

ScholarsArchive@OSU

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

Resistance in hops to systemic rootstock and crown infection by downy mildew

Evaluation of assay systems for the determination of susceptibility of the hop (Humulus lupulus) to Verticillium wilt caused by Verticillium dahliae

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

Understanding sporulation and dissemination of Podosphaera macularis, hop powdery mildew

Verticillium wilt, nematodes, and soil fertility interactions in hop yards

Powdery mildew (Podosphaera macularis Braun & Takamatsu) resistance in wild hop genetic resources

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

Tactics for enhancing conservation biological control of twospotted spider mites, Tetranychus urticae Koch, in Pacific Northwest hop yards

Biology of Meligethes seminulum lec. (Coleoptera: Nitidulidae)

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