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.

Bred for Success

Breeding
Oregon State University professor Ryan Contreras discusses the Nursery Crop Breeding Program at OSU and the current research being conducted into woody landscape cultivars with reduced invasive potential, increased disease resistance, and increased abiotic stress tolerance.

Protecting Container-grown Plants

Container

Pests and pathogens are a threat for growers that produce containerized nursery stock. The authors discuss how to reduce these threats by considering the type of containers and growing media they use, where they are sourced, how they are handled, and how they are stored.

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.

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.

Activity of Meadowfoam (Limnathes alba) Seed Meal Glucolimnanthin Degradation Products Against Soilborne Pathogens

Disease
Researchers evaluated the toxicity of glucolimnathin 1 and its degradation products on several important soilborne pathogens of high-value crops. Pests targeted in the studies included plant-parasitic nematode Meloidogyne hapla, fungus Verticillium dahliae, and oomycete Pythium irregulare.

The Effects of Methyl Bromide Alternatives on Soil and Seedling Pathogen Populations, Weeds, and Seedling Morphology in Oregon and Washington Forest Nurseries

Disease
Fumigation treatments (a conventional methyl bromide – chloropicrin application and reduced-rate alternative fumigant treatments) and a nonfumigated treatment were evaluated at forest nurseries in Oregon and Washington for their effects on soil pathogen populations, weeds, and seedling morphology.

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