Managing Phytophthora

Plant disease

Oregon State University affiliated author discusses the top 10 tips for preventing disease in nurseries. Specific topics addressed include site selection and drainage, sanitation practices, disease free plant sources, plants in container, and irrigation.

Sudden Oak Death and Phytophthora ramorum

Disease

A comprehensive guide for forest managers, Christmas tree growers, and forest-tree nursery operators in Oregon and Washington on sudden oak death, the disease caused by the recently introduced Phytophthora ramorum.

The effects of Phytophthora ramorum infection on hydraulic conductivity and tylosis formation in tanoak sapwood

Disease
Researchers investigated the the mechanism by which P. ramorum causes disease symptoms and mortality in tanoak trees. This study sought to determine the spatial and temporal development of tyloses in tanoak infected with P. ramorum, and the relationship between abundance of tyloses and specific conductivity of the xylem.

Genetic Methods for Mitigating Invasiveness of Woody Ornamental Plants: Research Needs and Opportunity

Breeding

A review of the different means by which the potential for invasiveness in woody ornamentals can be reduced using genetic methods. Progress is reviewed in conventional breeding and transgenic biotechnology approaches to producing sterile forms of ornamental woody plants.

Feeding Bare-root Trees

Fertilizer

Researchers, extension agents and growers affiliated with Oregon State University provide fertilizer recommendations for growing bare-root shade, flowering and fruit trees in Oregon's northern Willamette Valley.

Reducing Phytophthora

Plant Disease

Phytophthora species are some of the most problematic plant pathogens in nursery production systems. The Oregon State University affiliated author provides these top 10 tips which will help prevent this group of pathogens from taking hold.

Feeding Through the Leaves

Christmas Trees
Research was conducted at Oregon State University North Willamette Research and Extension Center with the objective of determining whether the addition of foliar fertilization would benefit a Christmas tree plantation or container-grown conifer operation.

When Mite Makes Right

Nursery Crops
Comprehensive guide on how to control spider mites in the nursery biologically by using predatory mites. Predatory mites are tiny little animals whose appetite for spider mites makes them a great tool for suppressing and managing mite outbreaks.

Into the Blue

Soil

A comparison of substrate amendments for the adjustment of hydrangea flower color based on data collected from studies conducted at Oregon State University North Willamette Research and Extension Center in Aurora, Oregon.

Testing Two Genera

Nursery Crops
Plant trials featuring Arctostaphylos and Grevillea varieties were conducted at Oregon State University North Willamette Research and Extension Center (NWREC). The purpose of the trials was to evaluate the plants performance in the landscape.

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