Cold Tolerance of Container-grown Green Ash Trees is Influenced by Nitrogen Fertilizer Type

Nursery Crops
Using green ash (Fraxinus pennsylvanica) trees as a model for fast-growing shade trees, the objective of this study was to determine whether N application rate and fertilizer type differentially influence cold tolerance of green ash.

Bud Necrosis of Green Ash Nursery Trees is Influenced by Nitrogen Availablity and Fertilizer Type

Nursery Crops
The objectives of this study were to determine whether bud necrosis in green ash was associated with tree N status, and whether green ash trees containing the same amount of N from different types of fertilizer exhibited similar amounts of bud necrosis.

A Systematic Approach to Diagnosing Plant Damage

A comprehensive guide for determining the difference between nonliving and living causes of plant damage. The authors also provide a list of available references for identifing plant problems, references topics vary from general plant problem diagnosis to crop specific.

Tomato Spotted Wilt Virus and Western Flower Thrips: Update

Plant Disease
Update report on tomato spotted wilt virus (TSWV) and western flower thrips. The Oregon State University affiliated author provides information about the plant species affected, genetic resistance to TSWV, insecticides, and cultural practices.

Plant Pathogens - Plant Diagnosis Clinic

Plant Disease
An overview of the B.C. Ministry of Agriculture and Fisheries plant diagnosis clinic at Cloverdale. The author discusses the history of the clinic, types of specimens examined, identified diseases and associated crops, and grower losses due to disease.

Aphids: A Brief Introduction

The Oregon State University Department of Entomology affiliated author briefly discusses aphids and their impact on plants. Other topics also addressed in the discussion include control using natural enemies of aphids and management methods.

Simple Monitoring of Black Vine Weevil in Vineyards

The adult black vine weevil (Otiorynchus sulcratus Fabricus), a well-known pest of ornamentals, started to make its way into vineyards located in the south central coast of California in the late 80's. A study conducted on control of the pest in vineyards is discussed.

Biology and Control of Honeylocust Pod Gall Midge

A brief discussion about the honeylocust pod gall midge (Dasineura gleditschiae), a pest of Oregon honeylocust trees. The Oregon State University affiliated author addresses the biology and chemical control of the honeylocust pod gall midge.

New Insect and Mite Pests of Conifers

The Oregon State University affiliated author discusses several pests of conifers and possible controls. The pests addressed include an eriophyid mite ("leaf vagrant" type), coneworms (Dioryctria), and a spider mite (Eotetranychus libocedri).

Physiology and Culture of Picea pungens 'Hoopsi'/Picea abies Grafts

Nursery Crops
A study was conducted to determine the physiology of graft formations in Picea pungens 'Hoopsi' scions grafted on Picea abies rootstocks. The purpose of the study was to identify factors limiting grafting success and improve production techniques.