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




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
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.
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.
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
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
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
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.
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, 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.
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.
April 1, 1978
The authors discuss the importance of water quality in regard to irrigation water, the source of the water used, and the various pathogens it could contain. Detection of pathogens in water, control methods, and a titration method for chlorine content are addressed.
December 1, 1965
Eight different ornamental species were planted and treated with various herbicides in a two to three year study to determine the herbicides effectiveness at weed control. The details and results of the study are discussed by the Oregon State University affiliated author.
November 1, 1978
The Oregon State University affiliated authors discuss fertilizers for container grown plants and the different factors to take into account when making or buying a fertilizer mix. The North Willamette container mix and suggestions for use are included.
April 1, 1967
Root base rot and a specific Penicillium rot was affecting the forcing of lilies in the Pacific Northwest. Studies were carried out to discover a successful control for the two rots and are discussed by the author.
July 1, 1979
A survey and eradication program was put into place after pear trellis rust (Gymnosporangium fuscum), was found in the Frasier Valley, British Columbia in 1972. A pear and juniper quarantine was imposed in the area in an effort to gain control of the disease.
June 1, 1970
The influence of lily bulb maturity, temperature, and long day treatments on flowering was researched in this Oregon State University affiliated project. The three cultivars of Easter lilies tested were; 'Ace', 'Croft', and 'Nellie White'.
May 1, 1957
The effects of Cherry Crown Gall on cherry tree productivity in comparison to disease free cherry tree productivity are researched in this 1952 study. The results of the study indicate trees planted with galls on roots showed reduced vigor and infection with new galls.
March 1, 1980
A table put together by Robert Stebbins, an extension tree fruit and nut specialist in affiliation with Oregon State University. The table provides information on a variety of pear rootstocks, the general characteristics of the rootstock and limitations of the rootstock.
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.