Computer Modeling and Simulation of Plant Development

Management
The Oregon State University affiliated author discusses the use of computer modeling and simulation of plant development. The discussion includes various different ways growers could use the technology to improve multiple aspects of their operation.

Douglas-Fir Needle Midge...Determining a Spray Schedule Through Use of a Midge Trap

Christmas Tree
Douglas-fir needle midges are discussed in regard to their impact on Christmas tree production. The topics specifically addressed are; midge descriptions, building emergence traps, chemical control, cultural control, physical control, and biological control.

The Columbia Root-Knot Nematode Problem

Management
In 1982, new regulations were put in place by Canada in an attempt to limit the Columbia root-knot nematode from spreading to Canada. In regard to the nematode, the author discusses; the problem, distribution, habitat, life cycle, hosts, and controls.

Flatheaded Apple Tree Borer & Pacific Flatheaded Borer: Live Larvae - Dead Trees

Insects
A discussion about the flatheaded apple tree borer (Chrysobothris femorata Olivier) and the Pacific flatheaded borer (Chrysobothris mali Horn). The authors offer information concerning; physical descriptions, habits, life cycle, damage, and several control methods.

Pseudomonas Syringae Damage Increasing in Some Nursery-Grown Shade Trees

Plant Disease
Increased damage by Pseudomonas syringae, a bacterial disease, was noticed on a variety of nursery-grown shade trees. Research was conducted to determine how the bacterium was spreading, conditions encouraging infection, and possible control methods.

The Western Spruce Budworm Strikes Again!

Insects
The western spruce budworm (Choristoneura occidentalis Freeman), a native Oregon insect, is the subject of discussion. The author addresses the history of the pest in Oregon, life cycle, damage caused, controls, and plans to implement a spray program.

'Autumn Blaze' - New Callery Pear Introduction from Oregon State University

Breeding and Selection
Callery pear (Pyrus calleryana) cultivars are the subject discussed after the introduction of a new cultivar, 'Autumn Blaze', to the nursery industry. The characteristics of 'Autumn Blaze' are addressed along with information regarding other Pyrus calleryana cultivars.

Leaf Necrosis - Defoliation

Plant disorders
The Oregon State University affiliated author discusses leaf necrosis, specifically two of the frequent causes of leaf necrosis and/or defoliation. Water and heat stress, and 'anthracnose' are addressed in relation to their contribution to leaf necrosis and/or defoliation.

The Chemical Basis for Resistance of Certain Rhododendron Cultivars to Foliar Feeding by Root Weevils

Breeding and Selection
Studies were conducted to determine if there was foliar feeding resistance to root weevils in certain rhododendron cultivars. The results, suggesting the lepidote branch had more resistant cultivars than the azalea branch, are thoroughly discussed by the author.

A Root Weevil Perspective

Insects
Root weevils can be a serious pest for Oregon growers of ornamental plants, the root weevil feeds on more than 100 plant species. The author offers a brief but informative discussion on the life cycle, root and foliar feeding, control of adult root weevil, and larval control.

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