Disease Control for Perennial Plants

Plant Disease
The Oregon State University affiliated author discusses implementing preventative disease control programs for a wide variety of perennial plants. A list is provided of the many different perennials grown in the pacific northwest and the diseases they are commonly associated with.

Phytophthora Crown Rot of Rock Daphne

Plant Disease
A warning to growers of rock daphne (Daphne cneorum) in 1976 after Phytophthora crown rot was detected in rock daphne production fields. Very little was know about the disease at the time but the authors reference a previously published report on Phytophthora as a general guide for growers.

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.

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.

What about Phytophthoras in the Pacific Northwest?

Disease
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.

Rots Currently Affecting Lily Forcing

Bulbs
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.

New Fuchsia Disease Favored by Warm Weather

Greenhouse Crops
Root rot (Phytophthora parasitica) was thought to be affecting fuchsias of all ages around the Portland, Oregon area in the summer of 1958. Tests were conducted to figure out whether the root rot really was the cause of the observed symptoms.

High Temperatures Curb Poinsettia Rot

Nursery Crops
Research was conducted on poinsettia root rot in an effort to control the severe losses growers were experiencing due to poinsettia root rot. The study used a variation of temperature and lighting conditions and then observed under what conditions the plants did best.

New Rootstocks Reduce Blackline Danger

Rootstocks
Several varieties of walnut rootstocks were tested in a study to find suitable rootstock with the hope of preventing blackline disease. The author provides background information about blackline disease in Oregon and it's impact on growers.

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