European Rhododendron Rust

Plant Disease
European rhododendron rust (Chrysomyxa ledi var rhododendri), is a disease which can lead to severe defoliation in rhododendrons and deciduous azaleas. The rust also affects it's alternative host, spruce (Picea sp.) and can cause severe defoliation. Symptoms, disease lifecycle, and control are discussed.

Supply & Demand Information - "The Most Popular Shade and Flowering Trees"

Nursery Crops
Survey of the most popular shade and flowering trees taken by the National Landscape Association (NLA) over a 26-year period. The NLA surveyed members from the Northeast, Southeast, Great Lakes, and Great Plains and based their tree selections on hardiness, maintenance, and aesthetics.

Foliar Fertilization Efficacy

Final report on research project comparing different methods of fertilization of field grown conifers and also containerized conifers. Study covers methods used, products tested and results obtained.

Biological Control of Insects With Insect-Pathogenic Nematodes - A Brief Status Report

Insects
Increased interest in using biological control of insects by nurseries prompted the author to provide the brief report on using pathogenic nematodes for insect control. Topics discussed include nematode species, nematode lifecycle, host insects, and other factors.

Perennial Weed Control in Nurseries

Weeds
The author discusses the importance of noxious weed control in nursery crops along with chemical control methods. Specific noxious weeds identified in nurseries include yellow nutsedge, quackgrass, Canada thistle, field bindweed, horsetail rush, blackberries, and dandelion.

Atrazine - Herbicide Degradation, Carry Over, and Buildup

Management
Oregon State University extension agent specializing in horticultural weeds discusses the herbicide atrazine. Specific topics addressed by the author include; herbicide degradation, carry over, buildup, and management of herbicide residues in horticultural crops.

Weed Assessment Survey for Nursery Production now available online!

This survey will help clarify the current weed management needs of the nursery industry.

Quackgrass-A Serious Problem Weed

Weeds
Quackgrass (Elymus repens L. Gould) is a perennial problem weed of the cooler climates in the Northern Hemisphere. Quackgrass reproduction and spread, competition with crop plants, and quackgrass control methods are addressed in the article.

Photoperiod - A Grower Management Tool for Controlling Plant Growth and Development

Management
The use of photoperiod as a management tool to achieve optimal plant growth and development in a nursery or greenhouse environment. The information provided includes explantations of photoperiod; how it works, its importance to the grower, and the various effects of photoperiod manipulation.

New website focusing on species of Phytophthora launched by OSU Professor Jennifer Parke.

Forest Phytophthoras of the World is an international resource for the latest information on ten major species of Phytopthora.

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