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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Greenhouse Grower Magazine

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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
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.
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.
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
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
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
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
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, 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, 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.
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.
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.
An in-depth look at the relationship between phosphorus, container plant health, the impact of phosphorus on the environment, and possible solutions.
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.