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

September 1, 1979
Progress report on research conducted on crown gall and hairy root disease in the northwest. Noninfectious hairy root on apples, the effect of crown gall on boysenberry production, and biological control of crown gall on fruit and shade trees are discussed.
June 1, 1971
Pea pears capture the interest of the author for their use in ornamental horticulture. The pea pear was especially attractive because the pears stayed on the tree and display a variety of fall foliage coloration. Descriptions of various varieties of pear tree size, foliage color, bloom time and other ornamental factors are provided.
August 1, 1957
Several English apple rootstock were studied in variety trails and are discussed in regard to differences in production, tree size, and resistance to specific pests.
May 1, 1981
Phytotoxicity, damage to plants from pesticides, usually occurs most commonly in five forms on ornamental plants; burn, necrosis, chlorosis, leaf distortion, and stunting. The author discusses the five plant disorders along with general rules or guidelines to help reduce phytotoxicity.
December 1, 1972
After it was notice that Arborvitae (Thuja occidentalis) produced sparse, yellow-green foliage during years of heavy cone production, trials were conducted. The Oregon State University affiliated trials focused on cone prevention with the use of two different treatments.
February 1, 1958
A new method for propagation of hardwood cuttings of dwarf apple rootstock is discussed by the author.
July 1, 1981
A discussion about the apple tree pest, the woolly apple aphid (Eriosoma lanigerum), by an Oregon State University affiliated entomologist. Topics include; descriptions, behavior, association with canker, life cycle, natural control, and chemical control.
October 1, 1975
Pesticides were tested over a period of four summers for improved control of European pine shoot moth. The author suggests several methods for predicting the first spray application date as it can vary from year to year.
March 1, 1959
The results of a 1958 marketing survey to determine the nursery buying habits of homeowners in the Portland, OR area. The survey included questions about the influence of home value, age, length of residence, and family income on buying habits.
November 1, 1981
The pine needle sheath mite, Trisetacus campnodus (Acarina: Eriophyidae), was reported to be causing damage first on plantation scotch pine. The mite was then discovered on two other pines, black pine (Pinus nigra), and cluster pine (Pinus pinaster).
April 1, 1976
Control of barnyardgrass (Echinochloa crus-galli) and redroot pigweed (Amaranthus retroflexus) was a growing problem in the nursery environment. Research was conducted to determine an effective control for both of the weeds, the results of the experiments are discussed by the author.
December 1, 1959
Rose rootstock and scions were researched in this Oregon State University affiliated study. The tests were conducted to determine the importance of rootstock in the nursery and garden.
January 1, 1982
The author discusses the programmed plant development of bare-root of deciduous trees and controlled environments to ensure plants goes though the required developmental stages post field removal in order to be acclimatized to new environments.
July 1, 1976
Research was conducted to gain incite into the fungal disease, Lophodermium needle cast, affecting Scotch pines in the Pacific Northwest. The most susceptible species were considered to be Scotch pine (Pinus sylvestris), red pine (Pinus resinosa), and Monterey pine (Pinus radiata).
March 1, 1961
Croft lilies are discussed by the authors in relation to the importance of continuously selecting the best lilies for production as growers were faced with more and more challenges at that time.
July 1, 1982
The Oregon State University affiliated author examines the practice of complementary field plantings and the various benefits of the practice. A list is provided that includes multiple practical ideas for growers to incorporate into their operations for increased efficiency.
October 1, 1976
Veinal chlorosis in the leaf tips of maple and other shade trees was a persistent problem although it was notice some of the trees out grew the symptoms. Several Acer saccharinum cultivars were used in experiments testing the tolerance of the trees to the herbicide.
January 1, 1963
Due to widespread interest in Old Home as a pear rootstock, studies were conducted to test its disease resistance and to establish effective propagation methods. The Oregon State University affiliated author discusses the results of the study and provides propagation recommendations.
The following minerals are addressed in the Octoberpest 2006 presentation: nitrogen, phosphorus, ammonium, magnesium, potassium, sulfur, calcium, boron, copper, zinc, salt, and fluoride.
April 1, 1977
Concern was growing about increasing Black Vine weevil populations in the winter of 1976-77. Part of the reason for concern over the weevil infestation was the lack of approved pesticides for the weevil. The authors discuss possible control methods and encouraged growers to learn about the Black Vine weevil.
December 1, 1963
Several different varieties of garden lily bulbs and their response to insecticides was the subject of the Oregon State University affiliated study. The author discusses the results of the study and provides tables to illustrate the data collected.
February 1, 2010
Nursery-grown green ash (Fraxinus pennsylvanica ‘Summit’) trees were tested to determine the relationship between the nitrogen (N) status of the trees in the fall and bud necrosis during the following spring. The results of the study and it's implications are discussed by the authors.
October 1, 1977
Research was conducted by University of Idaho affiliated horticulturists answered concerns raised about the water shortage and how often to irrigate orchards. The types of trees used in the study were; Red Delicious, Rome Beauty and Jonathan apple trees and Italian prune trees.
May 1, 1964
Nutrient deficiency was investigated in the large-flowered hybrid clematis 'Ramona' after it was noticed that the large-flowered hybrid clematis often became chlorotic. The tests used several different nutrients to determine the cause of the deficiency.
August 1, 1978
A report on research conducted by Dr. Davis of the University of Massachusetts testing the root hardiness of several Pieris cultivars released to the nursery industry by Oregon State University. The two Pieris cultivars tested were, 'Valley Valentine' and 'Valley Fire'.
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
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.
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.

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