Hawthorn Leaf-Blight

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.

Distribution of SEEBB and DED in Oregon

Dutch elm disease, Ceratocystis ulmi, and it's principle vector the European elm bark beetle, Scolytus multistriatus, are traced from their arrival in the US to their detection in various Oregon counties. Detection methods are discussed along with anticipated increased efforts to slow the spread of Dutch elm disease.

Tent Caterpillar Alert

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

Conifer Needle Rusts

PLant Disease
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.

Progress Report on Phytophthora Ilicis Research--1975

PLant Disease
A report on the progress of research to find a control for Phytophthora illicis in cut holly and holly plants in the field. The results of the two year study suggests a viable control for Phytophthora illicus once it is detected but not for use in prevention of the fungus. The authors discuss their goals for the ongoing research.

Status of the European Shoot Moth in Oregon

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.

Pine Shoot Moth Control

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.

What about Phytophthoras in the Pacific Northwest?

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.

Mugo Pine Cuttings Rooted in June or January

Breeding and Selection
Over a seven year period Mugo pine (Pinus mugo mughus) was researched by the Department of Horticulture at Oregon State University, the project focused on selection and vegetative propagation of Mugo pine. The results led to anticipation of the release of several cultivars varying in appearance.

35 Years of Specialty Horticultural Research

Nursery Crops
The results of 35 years of horticultural research in nursery and ornamental crops conducted at and in affiliation with Oregon State University are discussed. Topics include; defoliation problems, gladiolus, new crop development, lilies, holly, wood waste utilization, ornamental plant nutrition, graduate research assistance, rose and tree fruit rootstock research, ornamental research, root regeneration, propagation research, and plant growth research.