Herbicide Contaminated Soils May Become a Major Problem

Soil Media
University of Maryland affiliated author discusses the effects of herbicide contaminated soils. Specifically addressed is the issue of herbicides used during row crop production and the later use of those same sites for nursery ornamental and conifer production.

Some Practical Tips on Pruning Shrubs

The comprehensive guide to pruning shrubs is broken down into three main categories; plants flowering on current years growth, plants flowering on old growth, and plants grown for special effects. The author also addresses problems, solutions, and conclusions in relation to pruning shrubs.

Cultural Practices for the Management of Plant Parasitic Nematodes

Information provided on cultural pest management practices for control of plant parasitic nematodes in the nursery industry. The main topics of discussion include; nematode identification, crop rotation, fallowing, weed control, resistant plant material, soil amendments, and sanitation.

Use of Yellow Sticky Traps in Greenhouses

Greenhouse Crops
A brief report on the yellow stick traps used in greenhouses to monitor and/or reduce certain pest populations. The topics discussed include; types of pests caught by the traps, how often to check traps, where to put traps, how many traps to use, and whether traps should be vertical or horizontal.

Options for Energy Conservation for Greenhouse Growers

Greenhouse Crops
Topic of discussion is energy conservation in greenhouse crop production. Five specific categories to address in energy conservation for greenhouse growers include management, maintenance, mechanization, masonry, modification, and memory. The author elaborates on subcategories for each of the five categories.

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.

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

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

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.

Nutrient Analysis Problems in Douglas-fir Christmas Trees

Christmas Tree
The results of an Oregon State University affiliated two year study on the nutrient levels of Douglas-fir trees on Oregon Christmas tree plantations. Samples were taken from trees four and five years old in the Corvallis, OR and Willamette Valley areas.

Grovesiella Abieticola - Associated With a Canker Disease of True Firs

Grovesiella canker caused by the fungus Grovesiella abieticola was known to infect True fir in Northern California and B.C. Canada but was discovered on Noble fir Christmas tree farms in Western Oregon and Washington in the mid-1980's. Descriptions of the fungus and control methods are included in the article.