Progress Report on Research in Black Vine Weevil Control

An update on research that was conducted in Black vine weevil control based on what had been on going research for black vine weevil control for both larva and adult. The researchers discuss their results and offer control tactics they found successful.

Special: Cyclamen Mite Alert

Greenhouse Crops
As the popularity of foliage plants from subtropical and temperate climates increased in the Pacific Northwest, so did the incidences of cyclamen mite (Steneotarsonemus pallidus Banks) infestations. Descriptions and lifecycle of the mite, symptoms of damage, and controls are discussed.

Bark and Sawdust - Mulches in Maintenance Planning

Soil media
Using mulches in landscaping and gardening environments is the topic discussed by the author. Specific areas addressed are; types of mulch, effect of mulch on microclimate, effect of mulch on soil conditions, and problems in mulch selection.

Avoiding Pesticide Phytotoxicity

Plant disorders
The University of Florida affiliated author addresses how to avoid pesticide phytotoxicity in ornamental plants. The five most common types of phytotoxicity identified are; burn, necrosis, chlorosis, leaf distortion, and stunting or abnormal growth.

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.

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.

Leaf Browning and Shedding - Arbor-Vitae and Juniper

Plant disorders
Leaf browning and shedding in juniper and arborvitae are addressed in an effort to differentiate between natural causes and disease in the plants. The three fungi discussed can infect the plants and cause extensive damage, they are; leaf-blight (Didymascella thujina), tip-blight (Coryneum berckmannii) and juniper blight (Phomopsis juniperovora).

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).

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.