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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April 1, 1978
Two of the most commonly used treatments to change the salt content of water are explained and related to plant growth by the Oregon State University affiliated author. The two treatments, "ion exchange" and "deionization" are individually discussed.
May 1, 1966
Pear rootstocks were tested in an experiment to discover whether any of the rootstocks were resistant to pear root aphid (Eriosonia pyricola). Several different varieties were tested in the process and the author discusses the results of those tests.
March 1, 1979
The fungal plant disease "Anthracnose", Gloeosporium nervisequum, occurs when the conditions are favorable for fungus growth and a suitable host is available. The author describes the various symptoms of the disease and provides a partial list of susceptible hosts.
June 1, 1968
The standard method for propagation of Mugo pine (Pinus mugo) at the time the article was written was by seed. The challenges involved in propagating by seed were thought to be overcome by using summer softwood cuttings. Recommendations are made based on the rooting studies carried out by the authors.
September 1, 1979
A discussion about propagation and the transmission and control of plant diseases. The topics addressed in relation to propagation and plant disease include; significance of propagule transmission, control procedures, bulbs and corms, and seeds.
December 1, 1970
An experiment was conducted by the author on red-oiser dogwood plants to determine the importance of early defoliation. Leaf removal and its role in dormancy and cold hardiness are explained by the author in an effort to clarify the effect of early defoliation on plants.
May 1, 1957
The article discusses application of insecticide to control three common scales in western Oregon; soft brown scale, cotton-camellia scale, and Lecanium scale.
July 1, 1980
An informative discussion about "poisonous plants" and the need to be educated about plants so we not have to live in fear of them. The author also discusses a book called "Name Your Poison, A Guide to Cultivated and Native Oregon Plants Toxic to Humans".
March 1, 1972
The dwarfing pear quince, Cydonia oblonga, was commonly used as rootstock but had compatibility problems resulting in some varieties requiring an interstock. A plot was established in Corvallis, OR in 1965 to determine the importance of interstem length in pear trees.
November 1, 1957
The results of a study conducted on using antibiotics to reduce cherry crown gall are discussed by the author. Several different antibiotics and methods of application are tested in the experiments cited in the article.
July 1, 1981
A partial list of herbicides for perennial weed control intended for nurseries and ornamental plantings. The author addresses correct weed identification, weeds controlled and not controlled by the herbicides, terms used in weed control, and application methods.
September 1, 1975
A report on the history of the research conducted at Oregon State University (OSU) on important diseases of nursery, bulb, and florist crops. Topics covered are research on; fungus diseases, virus diseases, bacterial diseases, nematode diseases, and the past and future of ornamental research at OSU.
September 1, 1958
Research on the Hexe variety of azalea from 1957-58 indicated an interaction between light, temperature, nitrogen and their affects on azalea growth. The studies were conducted in four separate seasonal studies under greenhouse conditions.
September 1, 1981
Callery pear (Pyrus calleryana) cultivars are the subject discussed after the introduction of a new cultivar, 'Autumn Blaze', to the nursery industry. The characteristics of 'Autumn Blaze' are addressed along with information regarding other Pyrus calleryana cultivars.
March 1, 1976
Oregon State University affiliated author briefly discusses hawthorn leaf-blight, a common hawthorn disease, included are descriptions of the affected leaves, lifecycle, and control measures. The cause of the disease is Fabraea thuemenii, it leads to defoliation and possible death of the tree.
August 1, 1959
Several different insecticides were tested for control of soft scale on holly and camellia over a five year period. Brown soft scale (Coccus hesperidum) and cottony camellia scale (Pulvinaria floceifera) were the two most common soft scale pests of holly and camellia when the study was done.
January 1, 1982
Douglas-fir needle midges are discussed in regard to their impact on Christmas tree production. The topics specifically addressed are; midge descriptions, building emergence traps, chemical control, cultural control, physical control, and biological control.
June 1, 1976
A report of the author's observations concerning Dothiorella canker of crab apples, Botryosphaeria ribis. Symptoms of the fungus are discussed along with other plants the fungus was noticed to be affecting, control methods for the disease are also addressed.
December 1, 1960
Control of nematodes in clematis was researched in this Oregon State University affiliated study. Root rot nematode, Meloidogyne hapla, one of the most devastating pests of the flowering clematis is discussed specifically by the author.
January 1, 1982
An explanation of what agricultural grower associations are and what they do. The author also addresses reasons to join an association, how they are formed, who pays and when, and the advantages and disadvantages of agricultural grower association membership.
April 1, 1982
A discussion about the three major foliar pathogens of poplar trees identified in the Pacific Northwest; rust, Marssonina leaf spot, and shoot blight. The discussion includes descriptions of the pathogens, damage, life cycle, and controls for two of the pathogens mentioned.
October 1, 1976
A discussion involving the propagation of compatible pear rootstock, inter-stock and scions for production. Comparisons of the various varieties were based on overall tree size, compatibility, and yield per tree area for scion-rootstock combinations.
January 1, 1963
Stripe disease, also called "crazy disease" by growers, was researched in an effort to find a control method. The Oregon State University affiliated author also discusses future research to determine whether the disease was a virus or a fungus.
A discussion about the factors to consider when making irrigation decisions involving container plants in the nursery environment. Topics include leaching, irrigation timing, substrate material, and plant architecture.
April 1, 1977
Oregon State University affiliated Drs. Jim Green and David Adams discuss the importance of using an integrated system to provide the best root environment possible. The authors focus on the integration of media, irrigation, and fertilization, specially how the three components effect plant growth.
December 1, 1963
Oregon Christmas tree shipping trials were conducted in 1962 to determine the factors involved in deterioration of the trees post-harvest. Details of the study are discussed along with the factors that seemed to be the most important based on the results produced.
April 1, 2010
An investigation was conducted into the increased susceptibility of pear nursery trees to infection by Phytophthora syringae following fall foliar sprays of urea which increased nitrogen (N) content in the trees. The authors discuss the methods and materials involved in the experiments along with the results.
October 1, 1977
The University of Florida affiliated author addresses how to avoid pesticide phytotoxicity in ornamental plants. The five most common types of phytotoxicity identified are; burn, necrosis, chlorosis, leaf distortion, and stunting or abnormal growth.
November 1, 1964
Yew or Taxus are discussed as one of the more popular trees due to their variety in size, shape, shades of green. A descriptive list of yews, thought to be the best at the time the article was written, is provided.
June 1, 1978
A discussion of dogwood (Cornus florida L.) diseases and their impact on the growth of the shade tree which could have an effect on the market value of the tree. Diseases discussed include; foliar diseases, viruses, twig blights, root rots, cankers, and a few other important diseases.
May 1, 1966
The Easter lily bulb market shifted from Croft lilies to Ace lilies, growers had to adapt to the change in production timelines as the Ace lilies were slower to force. The authors discuss the effect storage temperature had on the Ace lily bulbs tested.
March 1, 1979
The USDA affiliated author addresses the issue of tree defoliation and re-foliation. Information is provided on the following topics regarding defoliation; the factors that influence tree defoliation, the effects of defoliation, and tree care.
June 1, 1968
In an effort to find an Easter lily that was more resistant to virus and diseases, an Easter lily breeding program was established in 1960 in Harbor, OR. A cultivar was produced that was promising to the researchers working on the project.
September 1, 1979
Research was conducted on the propagation of rhododendron, apples, raspberries, strawberries, lily bulbs, iris bulbs, Kalmia, Daphne, and arctostaphylos by tissue culture at the Northwestern Washington Research and Extension Unit.
June 1, 1971
Prevention and control of viruses affecting garden and Easter lilies were studied in Oregon by the Oregon State University affiliated author. Specific viruses are discussed in regard to characteristics of the virus, descriptions of size, and affected lily cultivars.
August 1, 1957
A helpful guide for recognizing Cucumber Mosaic virus in Gladiolus. A general timeline is given for how and when to rogue the plants infected with the virus.
January 1, 1981
A brief description of each of the six dwarf mugo-pines, Pinus mugo mughus, released to licensed nurserymen after years of research and cultivar selection. The author was looking for responses to a series of questions he had regarding the six mugo-pine cultivars.
December 1, 1972
Conditions and cultural practices to prevent "summer sprout" in 'Ace', 'Croft', and 'Nellie White' Easter lilies was the basis of two Easter lilies studies. Details and results of the experiments are discussed with the hope of conducting future research based on the results found.
February 1, 1958
A propagation project on English Holly (Ilex aquifolium) at Oregon State University looked at the effectiveness of holly propagation by air layering cuttings with berries for market potential. Another propagation project discussed examined various degrees of shading and mist.
July 1, 1981
The apple maggot was detected on a homeowner's tree in the Portland, OR area in the late summer of 1979 and was again detected on other noncommercial plantings the following year. Apple maggot hosts, damage, detection and control are addressed by the author.
October 1, 1975
Concerns about Phytophthora and it's impact on the Pacific Northwest nursery industry are discussed. The authors offer incite into the disease itself, control methods, phytophthora prevention in propagation, phytophthora prevention in containers and growing beds, prevention of the disease in the field, and future phytophthora research directions.
December 1, 1958
Studies on Croft lily bulbs treated with Thimet examined the insecticides effectiveness as a control against nematodes, aphids and fungus. The study also looked at the effect Thimet had on plant growth when forcing Croft lilies.
November 1, 1981
The western spruce budworm (Choristoneura occidentalis Freeman), a native Oregon insect, is the subject of discussion. The author addresses the history of the pest in Oregon, life cycle, damage caused, controls, and plans to implement a spray program.
March 1, 1976
The topic discussed by the Oregon State University affiliated author is the brown garden snail and it's impact on the nursery industry. The issue of shipping and receiving plant material is addressed. Suggestions on how to control the snail and information on it's lifecycle are also included.
December 1, 1959
Croft lily summer-sprouting was a problem for growers in Curry County, Oregon in 1953 and 1954 which caused significant financial losses for the growers. Greenhouse tests were conducted to find a control for the summer-srpouting and to figure out the conditions that contributed to sprouting.
January 1, 1982
The Oregon State University affiliated authors offer incites into the issues concerning the timing of fall digging of bareroot deciduous trees. The authors discuss key concepts involving vegetative maturity and related research conducted on the subject.
June 1, 1976
The Oregon State University affiliated author offers incite into the importance of adequate aeration when choosing a growth medium. A few of the topics discussed include; the relationship between oxygen, root growth and plant growth, and symptoms of poor aeration.
March 1, 1961
Research was conducted for three years on control of the Black Cherry aphid in this Oregon State University study. Black Cherry aphids were a major pest of Black Cherry trees when this study was conducted as they attack the new growth and can proliferate quickly.
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.