Lophodermium Needle Cast

Plant Disease
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).

Bacterial Gall Disease on Douglas Fir, Pseudotsuga taxifolia

Plant Disease
Research indicated the disease bacterial gall on Douglas fir was caused by an insect, Cooley's chermes (Chermes cooleyi Gill.). The author offers descriptions of the galls, where they form on the tree, the impact the galls have on trees, and how the insect transmits the disease.

Juniper Decline

Nursery Crops
Junipers were affected by what appeared to be a unknown root disease. Although it was thought to be Phytophthora, because it could not be verified the disease was referred to as "juniper decline". The Oregon State University affiliated authors discuss the disease, it's symptoms, and research being conducted on the subject.

Douglas Fir Needle Cast

Plant Disease
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.

Insect Problems on Narrow Leaf Evergreens

Several insect pests of narrow leaf evergreen trees are discussed in regard to hosts, lifecycle, the type of damage caused, and control methods for each of the pests. The insects addressed are; the Cooley Spruce Gall Aphid (Adelges cooleyi), pine needle scale (Phenacaspis pinifoliae) and the black pineleaf scale (Nuculaspis californica), and Douglas fir needle midge (Contarinia spp).

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.

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.

A Review of Ornamental Plant Pathology at Oregon State University

Nursery Crops
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.