Rhododendron Rusts

Plant Disease
A brief report on the symptoms and lifecycle of several rusts known to attack rhododendrons. The disease first appeared in Oregon in 1955 and had become a serious problem for growers of susceptible varieties by the time this article was written.

Concepts in Pest Management

The Oregon State University affiliated author addresses concepts in pest management regarding weeds, disease, and insects. The need for integrated pest management control measures and how an integrated program can be implemented are included in the discussion.

Biology and Control of the Obscure Root Weevil on Rhododendron

Research was conducted on the obscure root weevil (Sciopithes obscurus), the main foliar feeding root weevil in Oregon, on rhododendrons in an effort to determine the biology and control for the weevil. It was the intention of the authors to provide information on control of the pest.


Plant Disease
The author discusses cankers on woody plants, caused by either a bacterial or a fungus. Descriptions of cankers, how and where cankers form, and life cycle are all addressed. While control varies from plant to plant, the author does offer general canker control guidelines.

Update: The Black Vine Weevil Plague

Concern was growing about increasing Black Vine weevil populations in the winter of 1976-77. Part of the reason for concern over the weevil infestation was the lack of approved pesticides for the weevil. The authors discuss possible control methods and encouraged growers to learn about the Black Vine weevil.

Back to Basics: The Optimum Root Environment

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.

Irrigation and Oregon Water Laws

Water availability for the upcoming growing season was a concern due to an unusually dry winter. The author discusses the legalities of Oregon water rights regarding greenhouse and nursery crops. Several different types of irrigation permits are addressed along with where to obtain them.

Warning--Be on the Look Out for Herbicide Contamination

Nursery Crops
Growers of ornamental plants were encouraged to monitor for signs of herbicide contamination from several different sources. The four sources of contamination discussed are atmospheric contamination, contamination of growing medium, fertilizer contamination, and water contamination.

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.

Pre and Post Emergence Poa Annua Control Program

Research was conducted in an experimental program on control of Poa annua in Kentucky bluegrass lawn turf and Bentgrass putting turf. Successful control methods were established and are discussed, along with other factors to take into consideration when implementing a control strategy.