Greenhouse

Oregon State University has a long tradition of supplying the nursery and greenhouse industry with science-based resources to benefit producers in Oregon.

Featured Links

The PNW Nursery IPM Website is designed to be dynamic, allowing growers and pest management professionals to give and receive information regarding pest activities in nurseries in the Pacific Northwest.

The OSU Landscape Plants website contains images, identification details and information on over 1,700 mostly woody, ornamental and native plants.

Associations and Government Agencies

ODA Plant Program

Oregon Association of Nurseries

International Plant Propagator's Society

USDA-Agricultural Research Service (ARS)

Production and Management

Greenhouse Grower Magazine

Nursery Management Magazine

 

Publications

Publications

January 1, 1999
USDA-ARS affiliated author discusses the relationship between rooting and tissue nitrogen and protein content of ericaceous plants. The information presented is based on investigations into hormonal and nutritional regulation of root growth during propagation of common ericaceous plants grown in Pacific Northwest nurseries.
January 1, 2000
An experiment was conducted to determine whether application of plant growth regulators (PGRs) or moisture retention materials could modify IAA concentrations in roots, new root growth, and above ground plant growth. Douglas-fir, Englemann spruce, western larch, and lodgepole pine species were used.
January 1, 2000
A report on how the application of specific plant growth regulators (PGRs) and a moisture retention gel to the root systems of Douglas-fir can influence root indole-3-acetic acid (IAA) content, and tree growth and survival 10 years after planting in a clearcut.
June 1, 2001
Field trials were conducted to assess the potential to modify the IAA concentration in roots, root growth responses, and plant survival by root application of plant growth regulators (PGRs) such as IBA, NAA, and ethylene, or alginate, a moisture retention material.
September 1, 1989
Information provided on the bareroot nursery practice of root culturing. Root culturing is defined by the author as a general term for nursery cultural practices designed to modify root growth or morphology while the seedling is still in the nursery bed.
November 1, 1990
A comprehensive guide for determining the difference between nonliving and living causes of plant damage. The authors also provide a list of available references for identifing plant problems, references topics vary from general plant problem diagnosis to crop specific.
May 1, 1989
The Oregon State University Department of Entomology affiliated author briefly discusses aphids and their impact on plants. Other topics also addressed in the discussion include control using natural enemies of aphids and management methods.
July 1, 1989
An explanation of the 1988 amendments to the Federal Insecticide Fungicide and Rodenticide Act (FIFRA). The authors address what the amendments meant for growers, types of crops most affected, and concerns about pesticide re-registration.
July 1, 1989
An overview of the pesticide rules adopted by the Washington State Department of Agriculture in 1989. The new rules restricted pesticides containing one of more of the 18 active ingredients identified as having potential to contaminate ground water.
July 1, 1989
A discussion about capillary beds and also a how to guide on the construction of the beds for nursery production. Topics addressed include the construction of capillary beds, costs (labor, equipment, materials), root growth and development, leaf scorch, and pathogens.
January 1, 2004
The purpose of research conducted on young apple (Malus domestica Borkh) trees was to determine the fate of soil applied nitrogen to young apple trees and the influence of tree nitrogen status on nitrogen uptake by young apple trees.
April 1, 2004
A study was conducted on almond trees to (1) determine whether soil N application alters N remobilization; (2) quantify the effects of soil N availability in the spring on N uptake, distribution, and new growth; and (3) determine the most efficient time for spring soil N applications.
January 1, 2004
The objectives of this study were to determine the chemical composition of nitrogen (N) and non-structural carbohydrates in response to different N supplies and the interaction between storage N and non-structural carbohydrates in young almond trees.
January 1, 2004
Research was conducted on poplar (Populus trichocarpa ×P. deltoides) cuttings to determine whether different weekly nitrogen fertigation regimes altered nitrogen mobilization, nitrogen uptake, and growth of cuttings.
May 1, 1989
A guide to help minimize the amount of leaching created by greenhouse and nursery container production water runoff. Topics include nitrogen leaching, overhead irrigation with recirculation of runoff, and computer-controlled pulsed-trickle fertigation.
May 1, 1989
An overview of the B.C. Ministry of Agriculture and Fisheries plant diagnosis clinic at Cloverdale. The author discusses the history of the clinic, types of specimens examined, identified diseases and associated crops, and grower losses due to disease.
July 1, 1989
A study was conducted on Phytophthora root rot and the susceptibility of Pacific Northwest conifers. Twelve species of conifer were tested for susceptibility to five species of Phytophthora. Report includes methods, results, conclusions, and recommendations.
January 1, 2004
A report on the potential use of ectomycorrhizal fungi in vegetative conifer production to increase adventitious shoots and enhance root formation and/or subsequent root branching. The authors specifically discuss in vivo cutting production, in vitro organogenesis and somatic embryogenesis.
March 1, 1989
A brief discussion about the honeylocust pod gall midge (Dasineura gleditschiae), a pest of Oregon honeylocust trees. The Oregon State University affiliated author addresses the biology and chemical control of the honeylocust pod gall midge.
March 1, 1989
Information on methods designed to reduce and/or prevent pesticide resistance build up in insect or mite populations. Topics addressed include background information on resistance, pest biology, pesticide use, proper pesticide use and application.
March 1, 1989
A study was conducted to determine the physiology of graft formations in Picea pungens 'Hoopsi' scions grafted on Picea abies rootstocks. The purpose of the study was to identify factors limiting grafting success and improve production techniques.
March 1, 1989
An examination of different intermittent mist system control devices used for plant propagation. The author discusses a variety of control devices including but not limited to program repeating timer, light operated timer control, and multizone mechanical controller.
March 1, 1989
A discussion about Daphne X burkwoodii `Carol Mackie' for wider landscape use. Topics of discussion include plant origins, propagation experiments, effects of propagation date on rooting, effects of fertilizers on branching, and growing trials.
January 1, 1989
Research was conducted to determine container spacing strategies to reduce the effects of media temperature increases. The study was completed at a nursery in Florida using Ilex crenata `Helleri'. The authors discuss the results and offer incites into potential spacing strategies.
January 1, 1989
The Pennsylvania State University affiliated authors provide information on methods used to extend the longevity of cut flower peonies. Topics that are briefly discussed include cultivar selection, harvesting at the optimal growth stage, and storage techniques.
January 1, 1989
University of California, Davis affiliated study conducted on the ethylene effects on roses and the use of STS for cut roses. The authors address the effects of ethylene on different rose cultivars, effectiveness of STS, and practices to reduce ethylene damage.
January 1, 1989
Information provided on the use of STS for cut roses based on previous research indicating STS improved the life of cut roses. The steps the authors include in the process are preparation of stock solution, deciding on treatment conditions, and preparing the solution.
January 1, 1989
A report on studies conducted to determine whether irrigation water recirculating systems increases the spread of pathogens. Topics discussed include root death, factors causing root growth check, other possible pathogen sources, and chemical treatments.
November 1, 1988
The University of Washington affiliated author addresses the use of chemicals to defruit a tree or shrub in a landscape setting. The author identifies concerns about damage caused by unwanted fruit and the limitations of using chemicals to defruit trees and shrubs.
November 1, 1988
Report on research funding from Oregon horticultural organizations for 1987-1988. The Oregon State University Horticulture Department affiliated author lists which associations and commissions funded projects and how much was received.
September 1, 1988
The Ohio State University affiliated author discusses growing medium fungicide drenches and phytotoxicity. The discussion was prompted by reports of growers having issues with stunting and leaf burning after a fungicide drench of growing medium was applied.
September 1, 1988
Report on experiments conducted on the use of ELISA for detection of Phytophthora. The University of California, Davis affiliated authors address the reliability of ELISA for the detection of Phytophthora and several other diseases. They also discuss the future of their research involving ELISA and disease detection.
September 1, 1988
University of Maryland affiliated author discusses the effects of herbicide contaminated soils. Specifically addressed is the issue of herbicides used during row crop production and the later use of those same sites for nursery ornamental and conifer production.
September 1, 1988
Study conducted to determine an effective control for liverwort and moss in nursery containers. The topics discussed include the prevention of liverwort and moss establishment, control of established liverwort and moss, and phytotoxicity of tested chemicals.
September 1, 1988
Due to increased interest, information was provided for growers concerning safe pesticide use and disposal. The topics of discussion include disposal of empty pesticide containers, disposal of pesticides, and cleaning equipment.
September 1, 1988
An especially cold winter caused serious freeze damage to landscape plants in Georgia. Broadleaf species experienced the most observed freeze damage. The University of Georgia Department of Horticulture affiliated authors include a through list of landscape plants and associated freeze damage.
September 1, 1988
A report on root damaging temperatures for different plant species used in the landscaping and nursery industries. The Oregon State University affiliated author provides a list of deciduous and evergreen plants species and corresponding temperatures for root damage.
September 1, 1988
Information provided on cold injury occurring during dormancy. Specific topics addressed include; the effects of freeze damage, cold tolerance between plant tissues, winter sun scald, frost cankers or bark splitting, and winter drying of evergreen foliage.
July 1, 1988
The comprehensive guide to pruning shrubs is broken down into three main categories; plants flowering on current years growth, plants flowering on old growth, and plants grown for special effects. The author also addresses problems, solutions, and conclusions in relation to pruning shrubs.
July 1, 1988
The Michigan State University affiliated author addresses the issue of desiccation of bare-root nursery stock. Topics of discussion include; conditions that increase the probability of desiccation, most susceptible phases for bare-root stock desiccation, and control methods.
July 1, 1988
Information provided on cultural pest management practices for control of plant parasitic nematodes in the nursery industry. The main topics of discussion include; nematode identification, crop rotation, fallowing, weed control, resistant plant material, soil amendments, and sanitation.
May 1, 1988
A discussion about the computer program, Plant Cost Accounting, intended for use by greenhouse and nursery business or growers. The computer program allows the user to accurately calculate the costs involved in plant production and price the plants accordingly.
July 1, 1987
Guide for the prevention and control of Stromatinia, Curvularia, Botrytis, Fusarium corm rot, thrips, nematodes, bulb mites and aster yellows mycoplasm. Information provided on how to cure and store gladiolus corms, dormancy, and Rhizoctonia solani.
May 1, 1988
Information on the bacterium Xylella fastidiosa which is closely related to Xanthomonas. Xylella fastidiosa was found in the following shade and fruit trees; American elm, American sycamore, red oak, red maple, mulberry, periwinkle, grape, almond, plum, peach and from ragweed.
May 1, 1988
Information provided on the importance of glove selection to achieve maximum protection when handling chemicals. Specific glove materials, matching the glove material to the specific chemical being handled, and other considerations for glove and clothing selection are also addressed.
May 1, 1988
Report on the cancer risks of pesticide exposure and studies conducted to determine the effects of exposure to a variety of pesticides. The author discusses the results of the studies and their implication for the health of farmers and offers safety recommendations.
March 1, 1988
A technical report on what is know and what is not known about Pseudomonas syringae in the nursery industry. Main topics are plant symptoms, severity of the disease, classification of Pseudomonas syringae isolates, sources and survival, hosts, and controls and recommendations.
March 1, 1988
A discussion about root weevils that attack dozens of ornamental plant species in the Pacific Northwest; the Black Vine Weevil (Otiorhynchus sulcatus), the Strawberry Root Weevil (O. ovatus), and the Obscure Root Weevil (Sciopethes obscurus). Topics included in the discussion are biology, control, application, and nematodes.
November 1, 1987
A discussion about skin injuries caused by certain ornamental plants that occurred during planting or pruning. Causes of skin injuries included in the publication are mechanical injury, pharmacologic injury, primary irritant phytodermatitis, and allergic phytodermatitis.
November 1, 1987
Report on chemical growth regulators for use in greenhouse and nursery crop production. Studies were conducted to determined the effectiveness of the growth regulators on the following crops; zonal geraniums, hibiscus, hydrangea, kalanchoe, weeping fig, several trees species, poinsettias, Easter lilies, and freesia.

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