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

May 1, 1966
The use of sawdust mulch is discussed in relation to the horticulture industry and it's use of "sour" sawdust mulch as it was done at the time the article was written. The Oregon State University affiliated authors briefly discuss the effects the "sour" mulch had on ornamental plants.
March 1, 1979
A discussion of the influence stress can have on diseases of nursery and landscape plants. The author addresses the increased susceptibility to disease when plants are weakened by stress, drought or water stress, excess water stress, and high and low temperature stress.
June 1, 1968
A study was conducted to determine the effectiveness of a specific control for bulb fly larvae (Merodon equestrist) on Narcissus bulbs. The results showed it was possible to control the pests while leaving the Narcissus bulbs in the ground for the desired 2-3 years without being damaged.
September 1, 1979
Field studies were conducted to determine if adult root weevils feed on certain cultivars of rhododendron more than other cultivars. The author discusses the methods and results of the studies, including the difference in resistance of the cultivars used.
June 1, 1971
Previous propagation experiments conducted by Dr. L.T. Blaney, Department of Horticulture at Oregon State University, on tree peonies produced minimal results and were the basis of the author's own propagation experiments on tree peonies. Several different hormones were used and produced favorable results.
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.
July 1, 1981
Root weevils can be a serious pest for Oregon growers of ornamental plants, the root weevil feeds on more than 100 plant species. The author offers a brief but informative discussion on the life cycle, root and foliar feeding, control of adult root weevil, and larval control.
November 1, 1975
A brief history of the invasive pest European pine shoot moth, Rhyacionia buoliana (Schiff.), in Oregon. Surveyed Oregon counties found to have infestations were; Clackamas, Lane, Marion, Multnomah and Umatilla. Control methods for the moth are discussed along with descriptions of the life cycle and damage caused by the moths.
March 1, 1959
Several varieties of walnut rootstocks were tested in a study to find suitable rootstock with the hope of preventing blackline disease. The author provides background information about blackline disease in Oregon and it's impact on growers.
November 1, 1981
The idea of using clones in the Christmas tree industry is debated by the Oregon State University affiliated author. The use of clones could lead to more uniform sellable trees but could also lead to a lack of genetic diversity in the Christmas tree industry.
April 1, 1976
Tomato seedlings grown in greenhouses and garden centers were observed to be affected by bacterial speck , a leaf spot that could lead to defoliation and unsellable plants. The disease is caused by Pseudomonas tomato and was thought be carried on the seeds.
December 1, 1959
Clematis grown at Lewis-Brown Farm in Corvallis, Oregon was observed over a ten year period. The author includes a table showing bloom periods for each variety tested in the study.
January 1, 1982
The Oregon State University affiliated author discusses the use of computer modeling and simulation of plant development. The discussion includes various different ways growers could use the technology to improve multiple aspects of their operation.
July 1, 1976
Ideas for how to conserve energy in greenhouses are discussed by the Oregon State University affiliated author. The type and conditions of materials used can affect the amount of heat lost, light conservation is also briefly discussed.
August 1, 1961
Croft lily growers could use the bulblets to increase their stock quickly. Research conducted on Croft lilies production examined the conditions that produced the best bulblets, the results of the research are discussed by the Oregon State University affiliated authors.
July 1, 1982
A discussion about the use of grass in between rhododendron field plantings in the nursery environment for weed suppression, improved water drainage, and mud control. The types of grass covered include; perennial ryegrass, tall fescue, red fescue, hard fescue, chewings fescue, colonial bentgrass, kentucky bluegrass, and annual bluegrass.
December 1, 1976
After years of research conducted on Mugo or Swiss Mountain pine, a popular dwarfing shrub used in landscaping, six cultivars were selected to be released to the nursery trade. The selected cultivars were; OSU 67-2, 'Oregon Jade', OSU 67-5, 'Alpenglow', OSU 67-9, 'Elfengren', 67-15, 'Oregon Pixie', OSU 67-20, 'Tyrol', and OSU 69-2, 'Green Candle'.
January 1, 1963
Recommendations for storing holly to minimize the effects of mechanical injury, withering, defoliation and discoloration of leafs or berries. Methods discussed are partial drying, use of hormone treatments and additives, and cold storage.
Studies were implemented to determine if specific amendments could improve water retention in an effort to reduce the amount of water, nitrogen and phosphorus inputs needed.
June 1, 1977
Technological advances in container design are discussed by the Oregon State University affiliated author. A comparison of the standard pot design and a new pot design in relation to plant growth, container media, and function.
January 1, 1965
An eight year long study was conducted on Quince rootstocks at the Oregon Agricultural Experiment Station. The researchers were looking at varietal compatibility, growth control, effect of interstocks, and resistance to decline.
April 1, 2010
Container-grown ‘Summit’ green ash (Fraxinus pennsylvanica) trees were used in a recent study in an effort to determine whether cold tolerance of the tree's buds and stems are related to nitrogen (N) application rate and fertilizer form.
December 1, 1977
The release of disease resistant varieties of Pyracantha for the Pacific Northwest prompted a study investigating the plants resistance to frost, suitable cultural characteristics, and required plant maintenance. The authors discuss the study and it's results.
May 1, 1965
Clonal propagation of plums and cherries was studied in an attempt to determine a standardized method for propagating plum and cherry trees. The recommendations made were supported by research done in Oregon and elsewhere on clonal propagation.
August 1, 1978
Rhododendrons samples were collected from different cultivars and nurseries then tested for calcium and magnesium content. The rhododendrons involved in the study were were given ratings based on leaf quality, plant quality, and flower bud formation.
December 1, 1966
Questions were raised by lily bulb growers as to the amounts of phosphorus needed in bulb production and the timing of the applications of phosphorus. The authors conducted a study to determine the answers to the grower's questions and discuss their findings in the article.
March 1, 1979
Anthracnose, a leaf blotch caused by the fungus Gloeosporium, was becoming a common disease of flowering dogwood trees in the late 1970's in western Washington. Discussed are the symptoms of the disease, lifecycle, effect on tree growth, and control methods.
November 1, 1969
The topic discussed by the Oregon State University affiliated author is the challenge of timing Easter lilies for bloom around variable dates. A new production method is offered as a solution to the issue of timing Easter lilies.
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
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.

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