Greenhouse

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

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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.

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USDA-Agricultural Research Service (ARS)

Production and Management

Greenhouse Grower Magazine

Nursery Management Magazine

 

Publications

Publications

December 1, 1971
Readers are warned about the issues concerning leached cedar tow used for packing trees and shrubs. It was discovered that runoff from a pile of cedar tow was responsible for a fish kill and can also damage machinery. A few tips are offered on how to use cedar tow safely.
August 1, 1957
The fast forcing of Croft lilies for a specific production date is addressed by the author in this article. The results of a 1956-57 experiment are discussed which indicate optimal timelines and cultural practices.
May 1, 1981
The gypsy moth was detected in the Seattle, WA area in 1977 using pheromone (female sex scent) traps. The author discusses the gypsy moth in regard to; local history, the problem involving gypsy moths, eradication efforts, and the efforts nurseries could make.
September 1, 1974
The disease Phytophthora ilicis in cut holly led to berry and leaf infection and defoliation. Tests were preformed on the cut holly stems by dipping them in solutions and leaving some untreated for comparison. After a suitable solution was found it was tested on several varieties of holly.
September 1, 1958
Croft lilies were researched in an Oregon State University affiliated study in an effort to answer practical questions in lily production. The survey of five different grower fields in Curry County, Oregon took into account soil differences and management practices in relation to bulb growth.
September 1, 1981
The Oregon State University affiliated author discusses leaf necrosis, specifically two of the frequent causes of leaf necrosis and/or defoliation. Water and heat stress, and 'anthracnose' are addressed in relation to their contribution to leaf necrosis and/or defoliation.
December 1, 1975
In the winter of 1975, shade and fruit tree growers were warned about possible tent caterpillar population increases during the up coming growing season. Oregon counties that experienced high populations during the previous population spike in 1965-66 were; Multnomah, Columbia, Washington, and Yamhill
May 1, 1959
Rooting of large-flowered hybrid clematis cuttings was the subject of research in the two studies discussed by the Oregon State University affiliated author. The studies tested four rooting treatments on different varieties of clematis with varying results.
January 1, 1982
A discussion about the flatheaded apple tree borer (Chrysobothris femorata Olivier) and the Pacific flatheaded borer (Chrysobothris mali Horn). The authors offer information concerning; physical descriptions, habits, life cycle, damage, and several control methods.
May 1, 1976
Junipers were affected by what appeared to be a unknown root disease. Although it was thought to be Phytophthora, because it could not be verified the disease was referred to as "juniper decline". The Oregon State University affiliated authors discuss the disease, it's symptoms, and research being conducted on the subject.
October 1, 1960
Research was conducted on Croft Lily bulbs and the influence the digging date had on the number of flowers produced. The author discusses the assumptions made by the industry about Croft lily bulb production in that time period in relation to the results of the research.
January 1, 1982
A thorough and informative discussion about commodity commissions in Oregon. The author addresses what commodity commissions are, how and why commissions form, general information on how they operate, and advantages and disadvantages of commodity commissions.
September 1, 1976
The importance of thermometer accuracy in regard to energy conservation in the greenhouse is discussed by the Washington State University affiliated author. Directions are provided, instructing the reader on how to properly calibrate a thermometer.
September 1, 1976
A brief report on Cylindrosporium Padi, a serious fungal disease of cherry seedlings in nurseries. The Oregon State University affiliated author discusses symptoms of the disease, the timeline for leaf spot development, and causes of continued infection.
November 1, 1962
The importance of maintaining certain standards for shipping holly was researched in a 1957 study. The study involved several different groups in Oregon and Washington and experimented with various packing materials to to prevent the holly from drying out.
A discussion on wise water use for container production, presented at the 2006 Far West Show by Jim Owen.
April 1, 1977
Growers of ornamental plants were encouraged to monitor for signs of herbicide contamination from several different sources. The four sources of contamination discussed are atmospheric contamination, contamination of growing medium, fertilizer contamination, and water contamination.
August 1, 1963
The 'Peace' rose variety was used in a study to determine standard fertilizer treatments for the Oregon rose industry. Nitrogen, potassium, phosphorus, magnesium, and certain minor elements were all tested in the treatments.
January 1, 1983
A discussion about the use of computers in the agriculture industry to assist with researching diagnostic and and analytical problems. Also addressed are the benefits and concerns about the instant accessibility of pertinent information and what is available online.
August 1, 1977
Greenhouse and nursery container media along with the idea of using a wetting agent are discussed by the Cornell University affiliated authors. Research was conducted at the university testing approximately 150 wetting agents, methods and rates of application are addressed.
September 1, 1964
Tam and Pfitzer junipers were notice to be experiencing chlorosis and/or necrosis of certain foliage. Samples taken from several different nurseries indicated a possible magnesium deficiency causing the symptoms.
January 15, 2008
A discussion about the importance of plant root health in the landscape environment and the factors that can influence root system health. The authors address a variety of topics that influence root health ranging from nursery production methods to landscape practices.
April 1, 1978
Oregon State University affiliated author James Green, Extension Ornamental Specialist, discusses the practice of chlorinating water. Included in the discussion are characteristics of; chlorine, salts of hypochlorous acid and other chlorinating compounds.
December 1, 1965
Conditions for successful rooting of Old Home pear cuttings are discussed by the Oregon State University affiliated authors. After it was noticed that the cuttings rooted in fall did better than the spring rooted cuttings, studies were conducted to find out why.
November 1, 1978
A tutorial on how to establish a production schedule for container grown rhododendrons for Valentines Day and Mother's Day. The author discusses scheduling and cultural practice, evaluation of 140 cultivars, and first season flowering cultivars.
April 1, 1967
In 1960 a project was started to identify pear rootstocks resistant to pear decline, a virus that negatively impacted Oregon's pear orchards. Several viable clonal rootstocks were found and are discussed in regards to hardiness and resistance to other pear issues.
September 1, 1979
A discussion involving Narcissus Smolder (Botryotinia narcissicola) in the Pacific Northwest focused mainly on British Columbia. The author describes the disease, discusses the impact it had on the Narcissus industry in British Columbia and addresses control strategies.
December 1, 1970
Mugo pine, also called Swiss Mountain pine, was studied growing naturally and in gardens and arboretums in Europe by the Oregon State University affiliated authors. They share their findings and observations concerning Mugo pine selection and propagation.
May 1, 1957
A short article summarizing successful propagation of Azaleas by cutting grown in containers in a greenhouse.
July 1, 1980
Fertilizer trials involving Osmocote and minor element formulations were conducted in 1979 in British Columbia to determine appropriate formulation, the rates to be used, and how long the formulations lasted in their sawdust:peat mixes.
March 1, 1972
A report on the effectiveness of different treatments used to deflower 'Ace' and 'Nellie White' Easter lilies, tested in the 1971 growing season. Along with deflowering, observations were also made on foliar damage, plant height, and final bulb weight.
November 1, 1957
Oregon State University affiliate conducted a 15-year investigation into control of root rot in lily production. The results indicate a specific fungicide as being the most effective at helping the lilies grow. The author also includes methods for application of the fungicide and the economics involved.
July 1, 1981
An informative discussion about Bulbous iris forcing based on information involving fertilizer requirements from previously conducted studies. The author focuses on the following topics; nitrogen deficiency, calcium deficiency, and boron deficiency.
September 1, 1974
Over a seven year period Mugo pine (Pinus mugo mughus) was researched by the Department of Horticulture at Oregon State University, the project focused on selection and vegetative propagation of Mugo pine. The results led to anticipation of the release of several cultivars varying in appearance.
September 1, 1958
The study was carried out by the author based on a French method of propagating tree peonies using leaf-bud cuttings. Propagation of tree peonies had previously been done generally by grafting as propagation by cutting was considered very difficult to impossible.
September 1, 1981
The University of Minnesota affiliated author discusses container production of caliper shade trees. The "Minnesota System" was designed to address the following problems; root circling in the container, winter injury of root system, and tipping over in windy weather.
December 1, 1975
Dutch elm disease, Ceratocystis ulmi, and it's principle vector the European elm bark beetle, Scolytus multistriatus, are traced from their arrival in the US to their detection in various Oregon counties. Detection methods are discussed along with anticipated increased efforts to slow the spread of Dutch elm disease.
May 1, 1959
Oregon State University affiliated research on control of crown gall and black mold on Mazzard cherry seedlings is discussed the the author.
January 1, 1981
In 1982, new regulations were put in place by Canada in an attempt to limit the Columbia root-knot nematode from spreading to Canada. In regard to the nematode, the author discusses; the problem, distribution, habitat, life cycle, hosts, and controls.
May 1, 1976
Research indicated the disease bacterial gall on Douglas fir was caused by an insect, Cooley's chermes (Chermes cooleyi Gill.). The author offers descriptions of the galls, where they form on the tree, the impact the galls have on trees, and how the insect transmits the disease.
October 1, 1960
Cuttings of several kinds of deciduous azaleas were tested in studies addressing the lack of growth for rooted cuttings in the fall and winter. The study was based on the idea that fall and winter growth could reduce the time needed to produce a marketable plant.
January 1, 1982
An in depth look at agricultural cooperatives as a business organizational option. The author discusses what agricultural cooperatives are, how and why they form, who runs them, who does the work, and advantages and disadvantages of agricultural cooperatives.
September 1, 1976
A warning to growers of rock daphne (Daphne cneorum) in 1976 after Phytophthora crown rot was detected in rock daphne production fields. Very little was know about the disease at the time but the authors reference a previously published report on Phytophthora as a general guide for growers.
November 1, 1962
Based on interest in controlling soft brown scale (Coccus hespiridum) and other insect pests of holly, research was conducted on several insecticides. The insecticides were tested for effectiveness against more than one insect pest, the results of the research is discussed by the author.
Presented by Jim Owen at the 2006 North Willamette Research and Extension container workshop, a discussion about substrate in containerized production.
April 1, 1977
Water availability for the upcoming growing season was a concern due to an unusually dry winter. The author discusses the legalities of Oregon water rights regarding greenhouse and nursery crops. Several different types of irrigation permits are addressed along with where to obtain them.
August 1, 1963
A two year long study involving Croft lily bulbs and the effects of pre-planting treatments on the number of buds and plant growth. The results are briefly discussed by the Oregon State University affiliated authors.
January 1, 2010
The results of an investigation on pear (Pyrus communis L. OHF97) to determine whether specific factors influence the tree's susceptibility to Phytophthora syringae Klebahn. The factors included tree growth stage, nitrogen (N) status, wound age, and infection environment.
August 1, 1977
A brief report on the symptoms and lifecycle of several rusts known to attack rhododendrons. The disease first appeared in Oregon in 1955 and had become a serious problem for growers of susceptible varieties by the time this article was written.
November 1, 1964
Ace lilies are discussed by the authors in regard to possible methods to ensure a timely production after growers had disappointing production for Easter in 1963. Experiments were conducted to determine conditions and methods for forcing Ace lily bulbs by the Oregon State University affiliated authors.

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