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

August 1, 1957
Research studying the effectiveness of several different Rosa multiflora rootstock and scions specific to Oregon and other northern growers of roses are discussed by this author.
May 1, 1981
The dangers of tank mixing pesticides are addressed by the University of California affiliated author. The factors discussed include; chemical incompatibilities, physical incompatibilities, general principles for mixing pesticides, specific mixtures to avoid, and causes of phytotoxicity.
June 1, 1973
The history and impact of entomology research conducted in affiliation with Oregon State University is discussed by the author. Topics include; holly and camellia scales, gladiolus viruses, holly insects, pear root aphid, symphylans, tent caterpillars, and control of virus spread.
February 1, 1958
Survey of horticultural crop growers 1955 which included nurseries, florist crops, bulbs, rhizomes, corms, and holly. The author also looked at leading counties in specialty crop production in Oregon.
May 1, 1958
Azalea leaf gall disease and leaf spot disease were studied in an effort to find an effective control for the problematic diseases. Different varieties of azaleas were tested by spraying the plants with several different fungicides.
September 1, 1981
Studies were conducted to determine if there was foliar feeding resistance to root weevils in certain rhododendron cultivars. The results, suggesting the lepidote branch had more resistant cultivars than the azalea branch, are thoroughly discussed by the author.
November 1, 1975
A report on the progress of research to find a control for Phytophthora illicis in cut holly and holly plants in the field. The results of the two year study suggests a viable control for Phytophthora illicus once it is detected but not for use in prevention of the fungus. The authors discuss their goals for the ongoing research.
March 1, 1959
Cherry tree rootstocks were studied in various sections of the United States. The Oregon State University affiliated study worked to determine what each rootstock had to offer in terms of growth, cherry productivity, and longevity.
November 1, 1981
Studies were conducted to test the effectiveness of using a hot-callusing device when grafting a variety of different trees. The authors discuss the results of the hot-callusing method and it's effects on apple, peach, pear, prune, and Douglas-fir trees.
May 1, 1976
Several insect pests of narrow leaf evergreen trees are discussed in regard to hosts, lifecycle, the type of damage caused, and control methods for each of the pests. The insects addressed are; the Cooley Spruce Gall Aphid (Adelges cooleyi), pine needle scale (Phenacaspis pinifoliae) and the black pineleaf scale (Nuculaspis californica), and Douglas fir needle midge (Contarinia spp).
May 1, 1960
The effectiveness of various treatments for control of powdery mildew was tested on 360 rose plants. The three varieties of roses used in the study were chosen because of their susceptibility to powdery mildew.
January 1, 1982
Research was conducted on the effectiveness of using P-IBA as a rooting-inducing agent for the propagation of cuttings. Cuttings of two rhododendron cultivars, 'Ramapo' and 'Roseum elegans' were used in the experiments, the methods and results are discussed.
September 1, 1976
Leaf browning and shedding in juniper and arborvitae are addressed in an effort to differentiate between natural causes and disease in the plants. The three fungi discussed can infect the plants and cause extensive damage, they are; leaf-blight (Didymascella thujina), tip-blight (Coryneum berckmannii) and juniper blight (Phomopsis juniperovora).
January 1, 1962
Pear fire blight and pear decline are discussed in relation to rootstocks, trunk-stocks, scions, fruit production, fruit quality. The author offers insight into studies conducted on pear trees in Oregon and Washington.
July 1, 1982
A method for producing 'mini-trees' for commercial production in the nursery environment. The author discusses how the 'mini-trees' are produced, packing and transport, second-stage nursery and field establishment, the scope for mini-trees in the tropics, and a project proposal.
December 1, 1976
A report on the discovery of a bacterial leaf-spot, a species of Pseudomonas, on cuttings of two different Red maple varieties, 'October Glory' and 'Red Sunset'. The author discusses symptoms of the disease and possible control measures.
May 1, 1963
Research was conducted at Oregon State University affiliated Lewis-Brown Farm in Corvallis, OR on crab apple cultivars to identify which ones possessed desirable traits for ornamental horticulture. Recommendations for which cultivars to grow in the Pacific Northwest along with performance data on blossom and fruiting periods are provided.
Research was conduced on the effect of using a clay-amended substrate to improve nutrient and water efficiency for plants in containers. The presentation includes detailed results on the performance of the different plants used.
June 1, 1977
The author discusses cankers on woody plants, caused by either a bacterial or a fungus. Descriptions of cankers, how and where cankers form, and life cycle are all addressed. While control varies from plant to plant, the author does offer general canker control guidelines.
January 1, 1965
Several deciduous shade trees were studied at North Willamette Experiment Station, Oregon in an effort to determine tree growth rates, tolerance to growth regulators, nematicides, and herbicides.
April 1, 2008
A study was conducted involving Hydrangea macrophylla ‘Merritt’s Supreme’ to determine whether nitrogen (N) fertigation rates applied during vegetative growth and spray applications of urea in the fall influences plant growth and flowering during forcing.
December 1, 1977
The use of sawdusts and barks in media mixes and mulches is addressed by the Oregon State University affiliated author. The results of tests conducted to test the phytotoxic effects of two species of fresh bark are discussed along with recommendations.
June 1, 1965
Experiments were conducted on Nellie White Easter lily bulbs to determine plant response to the order in which the bulbs were preheated, pre-cooled, and held. The bulbs were dug from the Pacific Bulb Growers Research and Development Station in Harbor, OR and brought to Corvallis, OR for testing.
August 1, 1978
An update on research that was conducted in Black vine weevil control based on what had been on going research for black vine weevil control for both larva and adult. The researchers discuss their results and offer control tactics they found successful.
December 1, 1966
A program was developed after an increasing amount of rose rootstock varieties became infected with viruses that were being transmitted to the cuttings during propagation. Recommendations are given by the author on how to approach the rose virus problem.
March 1, 1979
A discussion about the history and discovery of the winter moth, Operophtera brumata, in Oregon State University and Oregon Department of Agriculture Entomology collections taken from the Portland, OR area. Appearance, damage, and life history are addressed.
November 1, 1069
Research was carried out on the deficiency symptoms of rhododendrons. The study was prompted by the lack of information on descriptive symptomatology in available literature, the results are discussed by the author.
September 1, 1979
Studies were conducted to test the resistance of rhododendron species to foliar feeding by the obscure root weevil. The author discusses the results of the rhododendron study and addresses the importance of studying plants resistance to insects.
June 1, 1971
The future of research and extension work in the ornamental industry at Oregon State University is discussed by the author. Research and extension staff worked to identify areas in need of research and established priorities with in those areas.
August 1, 1957
Author addresses the problem of "summer sprouting" in Croft lilies fields in southern, coastal Oregon. The 1955-56 experiments to control sprouting using temperature in the greenhouse are also briefly discussed.
May 1, 1981
A study of container media was established to determine and compare the water retention and aeration properties of the various mixes used. The following materials were combined into different mixes; peat, coarse sand, bark, fine sand, and sawdust.
December 1, 1973
The results of 35 years of horticultural research in nursery and ornamental crops conducted at and in affiliation with Oregon State University are discussed. Topics include; defoliation problems, gladiolus, new crop development, lilies, holly, wood waste utilization, ornamental plant nutrition, graduate research assistance, rose and tree fruit rootstock research, ornamental research, root regeneration, propagation research, and plant growth research.
May 1, 1958
The topic of root anchorage and/or breakage in very dwarf apple trees is briefly discussed in regard to rootstocks and scions.
September 1, 1981
The use of growth regulators in the greenhouse or nursery to chemically prune plants was studied, specifically Atrinal applied to Photinia x fraseri, in an effort to determine the effect on branching habit and height of the plant. The methods and results are discussed.
December 1, 1975
The lifecycle of conifer needle rusts and their association with the Christmas tree industry are discussed by the Oregon State University affiliated authors. A table is provided of the most common needle rusts found in Oregon, the table includes the needle rust's hosts, and alternative hosts.
March 1, 1959
Juniper webworm made its appearance in Oregon as a pest to ornamental and nursery plantings of juniper in 1951. The author describes how to identify and treat webworms on common juniper, Irish juniper, spiny Greek juniper and red cedar.
November 1, 1981
Increased damage by Pseudomonas syringae, a bacterial disease, was noticed on a variety of nursery-grown shade trees. Research was conducted to determine how the bacterium was spreading, conditions encouraging infection, and possible control methods.
May 1, 1976
A discussion of Douglas fir needle cast, caused by the fungus Rhabdocline pseudotsugae, as it was an increasing problem at the time this article was written. The author also discusses the fungus lifecycle, symptoms, control practices, and research being conducted on chemical controls.
May 1, 1960
Two separate variety trials were conducted on growing flowering crab apples on Malling rootstocks. The studies were conducted by Massachusetts State College and Oregon State College based on interest in size-control for landscaping plantings.
January 1, 1982
A discussion about the use of horticultural sprays and their effectiveness in controlling a wide variety of pests. The Oregon State University affiliated authors include the specifications for superior oils and the traditional caution statements.
September 1, 1976
The authors discuss the popular use of Pyrus calleryana as a pear rootstock. Pyrus calleryana did just as well if not better than Bartlett and Winter Nellis in Oregon State University studies. Included in the discussion are the issues growers were having with the rootstock and several possible solutions.
January 1, 1962
Verticillium fungus was a growing concern for geranium growers when this article was first published. The author was especially concerned for home growers and the impact Verticillium fungus would have on Oregon Willamette Valley geranium growers.
January 1, 1983
Computers were making their way into the nursery environment for everyday use and improved efficiency. Electronic marketing using a computer auction network, how it worked, the benefits involved, and other markets that were using electronic marketing are addressed by the author.
December 1, 1976
The Oregon State University affiliated author focuses the discussion on pest control in garden roses. Specifically addressed are symptoms and controls for "Black Spot", "Powdery Mildew", and "Rust". The three diseases are found on the leaves and new growth of the plants.
May 1, 1963
Croft Easter Lilies were studied at the Pacific Bulb Growers Research and Development Station in Harbor, OR in an effort to determine the effect of disbudding on lily bulb size.
January 1, 1983
A discussion about the wholesale nursery-greenhouse industry and the idea of using a computer auction network to increase plant transportation efficiency. The author addresses the process involved, "plant locator", "central computer", and other industries using a similar system.
June 1, 1977
Research was conducted on the obscure root weevil (Sciopithes obscurus), the main foliar feeding root weevil in Oregon, on rhododendrons in an effort to determine the biology and control for the weevil. It was the intention of the authors to provide information on control of the pest.
January 1, 1965
Following the success of a previous study to propagation Old Home pear (Pyrus communis) cuttings, experiments were conducted on several other Pyrus species. Two different propagations methods were tested on the various Pyrus cuttings.
September 1, 2008
Rhododendron (Rhododendron ‘H-1 P.J.M.’) and azalea (Rhododendron ‘Cannon’s Double’) were grown with (+N) or without (N-deficient) nitrogen (N) from May to September to determine the effects of N-availability on uptake, demand, and allocation of other mineral nutrients.
December 1, 1977
Using mulches in landscaping and gardening environments is the topic discussed by the author. Specific areas addressed are; types of mulch, effect of mulch on microclimate, effect of mulch on soil conditions, and problems in mulch selection.

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