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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Oregon Association of Nurseries

International Plant Propagator's Society

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Production and Management

Greenhouse Grower Magazine

Nursery Management Magazine




November 1, 1987
Dr. James Green, a horticulture extension specialist affiliated with Oregon State University, discusses the skin disease Sporotrichosis. The disease is caused by the fungus Sporotrichum schenckii and is usually transmitted in sphagnum moss but can also be found in nursery soils, flowers, shrubs, and lumber.
September 1, 1987
European rhododendron rust (Chrysomyxa ledi var rhododendri), is a disease which can lead to severe defoliation in rhododendrons and deciduous azaleas. The rust also affects it's alternative host, spruce (Picea sp.) and can cause severe defoliation. Symptoms, disease lifecycle, and control are discussed.
September 1, 1987
Research conducted in affiliation with Oregon state University on herbicide phytotoxicity of Ronstar, Methazole, and Priodiamine. Plants tested included Calluna vulgaris, Cotoneaster congesta, Euonymus fortunei 'Emerald n 'Gold', Ilex crenata 'Green Island' and Ligustrum japonicum.
July 1, 1987
Research conducted on growth and flower bud formation of three rhododendron cultivars grown with and without overhead irrigation. Authors were interested in determining the role of overhead irrigation and adequate soil moisture in preventing sunburned foliage.
July 1, 1987
Recommendations for specific tree species to incorporate into landscape settings based on a five-year study involving 460 cases and over 60 woody ornamentals. Tree species were ranked according to how likely the roots were to enter and damage sewage pipes.
July 1, 1987
The Oregon State University affiliated author addresses hot weather sprinkling and whether or not it damages or protects plants. Incite is offered into how water could be affecting the plants in high temperatures and whether or not it actually leads to plant damage.
April 1, 1987
Survey of the most popular shade and flowering trees taken by the National Landscape Association (NLA) over a 26-year period. The NLA surveyed members from the Northeast, Southeast, Great Lakes, and Great Plains and based their tree selections on hardiness, maintenance, and aesthetics.
September 1, 1986
North Carolina State University affiliated authors conducted a study to investigate the effects of planting azalea in raised and ground-level beds and pine bark. The study examined the survival rate of the plants and the population levels of Phytophthora innamomi.
September 1, 1986
Research conducted by Dr. R. G. Linderman on rhododendron leaf spot and stem die back determined both to be caused by Phytophthora syringae. Details about the effects and lifecycle of the fungus and possible control methods are provided.
September 1, 1986
The author discusses the importance of noxious weed control in nursery crops along with chemical control methods. Specific noxious weeds identified in nurseries include yellow nutsedge, quackgrass, Canada thistle, field bindweed, horsetail rush, blackberries, and dandelion.
September 1, 1986
Oregon State University extension agent specializing in horticultural weeds discusses the herbicide atrazine. Specific topics addressed by the author include; herbicide degradation, carry over, buildup, and management of herbicide residues in horticultural crops.
April 1, 1987
Increased interest in using biological control of insects by nurseries prompted the author to provide the brief report on using pathogenic nematodes for insect control. Topics discussed include nematode species, nematode lifecycle, host insects, and other factors.
December 22, 2009
Final report on research project comparing different methods of fertilization of field grown conifers and also containerized conifers. Study covers methods used, products tested and results obtained.
September 1, 1986
An informative discussion regarding eriophyid mites and their effect on Scotch, Australian, red, and white pines. Symptoms of eriophyid mite injury on pines, biology and control methods, and monitoring are the topics the author focuses on.
September 1, 1986
The results of experiments conducted by Agriculture Canada Saanichton Research and Plant Quarantine Station to determine procedures for forcing container grown rhododendrons. The authors discuss the details of the experiments along with the different rhododendron cultivars used.
November 1, 1986
Growers guide for adjusting fungicide and bactericide rate use amounts in water for foliage plants. Author provides information on rates of use for many different fungicides and bactericides, specifically offering amounts for smaller rates of use.
November 1, 1986
Oregon State University affiliated author offers an overview of commercial production of cut English holly in the Pacific Northwest. Topics include production statistics, marketing, culture, insect and pathogen problems, berry production, and post-harvest care.
This survey will help clarify the current weed management needs of the nursery industry.
July 1, 1985
Oxalis (Oxalis europaea), known also as Yellow Wood Sorrel, is a persistent weed with characteristic explosive seed dispersal from elongated pods. The University of California affiliated authors emphasize the importance of understanding seed production, dispersal, and germination.
July 1, 1985
Quackgrass (Elymus repens L. Gould) is a perennial problem weed of the cooler climates in the Northern Hemisphere. Quackgrass reproduction and spread, competition with crop plants, and quackgrass control methods are addressed in the article.
July 1, 1985
A detailed guide for how to overwinter container grown plants, produced in affiliation with the Oregon State University Horticultural Department. Topics covered include; an explanation on the theory of desiccation, effects of freeze damage, cold acclimatization, and the prevention of winter damage.
November 1, 1985
The general physical characteristics for identifying common root weevils are discussed along with characteristics for identifying several specific weevil species. Weevils discussed include; Clay-Colored Weevil, Obscure Root Weevil, Rough Strawberry Root Weevil, Strawberry Root Weevil, Small Grass Weevil, Woods Weevil, Woodburn Weevil, Black Vine Weevil.
July 1, 1985
Yellow nutsedge (Cyperus esculentus) is a persistent weed, especially in cultivated areas, that grows well in varying habitats with different environmental conditions. Information is provided on the following topics; identification, life cycle, infestation, controls, and year-round management.
July 1, 1984
The use of photoperiod as a management tool to achieve optimal plant growth and development in a nursery or greenhouse environment. The information provided includes explantations of photoperiod; how it works, its importance to the grower, and the various effects of photoperiod manipulation.
July 1, 1984
Computerized marketing allowed for increased interaction between growers and potential buyers and was the subject of discussion for the OSU affiliated author. An overview of the benefits of electronic marketing, along with its history, development risks and costs, and implementation.
April 1, 1985
A comprehensive guide for the management of root weevils including the strawberry root weevil (Otiorhynchus ovatus) in greenhouses, nurseries, landscapes and gardens. Topics discussed include root weevil damage, life cycle, hosts, and control.
July 1, 1984
Research was conducted on the distribution and chemical control of the black vine weevil in California nurseries after an increasing number of California nurseries were reporting control problems and damage associated with the black vine weevil.
Forest Phytophthoras of the World is an international resource for the latest information on ten major species of Phytopthora.
April 1, 1984
A summary of Dr. Frank Hall's presentation at the 1984 NW Ag Show in Portland, OR on chemical application of pesticides. Topics addressed in the summary include; spray deposition, importance of accuracy, methods, nozzle size, and nozzle calibration.
April 1, 1984
Washington State University affiliated author discusses the results of a six year study on the use of specific chemicals for weed control and their effects on both the weeds and the nursery plant in container-grown nursery plant production.
April 1, 2011
Article reporting on a containerized study conducted at the University of Georgia, determining the genome size estimates for 16 taxa and chromosome counts on 6 species of Callicarpa L. Details of methods and results are discussed and reviewed.
January 1, 1984
Electrical conductivity or 'salts' in soils and media are addressed by the author in terms of what a salt meter does, what electrical conductivity means, and how the information can help the grower. Several methods used to do electrical conductivity readings are included.
January 1, 1983
Washington State University affiliated entomologist discusses the European crane fly (Tipula paludosa) and it's impact in the Pacific Northwest. Topics addressed include it's introduction into North America, lifecycle, biological and environmental controls, and chemical controls.
An in-depth look at the relationship between phosphorus, container plant health, the impact of phosphorus on the environment, and possible solutions.
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.
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.