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.

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Production and Management

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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.
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.
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
A discussion of the influence stress can have on diseases of nursery and landscape plants. The author addresses the increased susceptibility to disease when plants are weakened by stress, drought or water stress, excess water stress, and high and low temperature stress.
June 1, 1968
A study was conducted to determine the effectiveness of a specific control for bulb fly larvae (Merodon equestrist) on Narcissus bulbs. The results showed it was possible to control the pests while leaving the Narcissus bulbs in the ground for the desired 2-3 years without being damaged.
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.