Reducing Phytophthora

Authors: Parke, Jennifer (OSU) Date: 2010

Phytophthora species are some of the most problematic plant pathogens in nursery production systems. The quarantine pathogen Phytophthora ramorum has received the most notoriety, but many Phytophthora species pose a challenge for nursery growers.

These pathogens cause trouble because of their persistence and spread in infested soil and water, and their ability to attack a wide variety of plants. Some species cause root rot, whereas others cause foliar blight and shoot dieback. Several species can infect plant parts both above and below the ground.

In collaboration with Niklaus Grünwald and Val Fieland of the USDA-ARS Horticultural Crops Research Laboratory, Carrie Lewis and I (Oregon State University) recently completed a three-year project to determine the most common sources of Phytophthora contamination in nurseries. We applied a systems approach to identify three critical control points in nursery production systems: contaminated soil/gravel beds, contaminated irrigation water, and used pots. Another potential source of Phytophthora spp., not included in our study, is nursery stock brought in from off site.

So what is the take home message for growers? Here are the top 10 practical tips for nursery growers:

Download (PDF): Reducing Phytophthora (2MB)

Native Plant Network Propagation Protocols

Author: Native Plant Network (various authors)

The Native Plant Network is devoted to the sharing of information on how to propagate native plants of North America (US, Canada, Mexico and the Pacific Islands). Search the database for extensive details on how to propagate different plants, or scroll through alphabetically.

Visit (website): Native Plant Network Propagation Protocols

Native Plant Propagation and Restoration Strategies

Author: Haase, D. and Rose, R. (OSU) Date: 2001

Abstract: Propagation and planting of native plants for habitat restoration is a multi-faceted process. There are many issues over which there is general agreement among restorationists, but there are a number of subjects that cause disagreement. For example, restorationists often agree that native plants should be emphasized, but disagree over where seeds or transplants should come from. In this paper, I examine four areas of controversy: the use single or multiple sources of a species at a given restoration site (the SOMS debate), source distance of plant materials, the use of native plant selections, and the importance of one’s definition of “native plant.” I conclude that some of these issues may be resolved through careful research, while others will remain a matter of personal opinion, and can only be resolved through a clear statement and scope of objectives of each restoration project.

Download (PDF): Native Plant Propagation and Restoration Strategies (3MB)

Raising Native Plants in Nurseries: Basic Concepts

Authors: Dumeroese, Luna & Landis (eds.) Date: 2012

Growing native plants can be fun, challenging, and rewarding. This booklet, particularly the first chapter that introduces important concepts, is for the novice who wants to start growing native plants as a hobby; however, it can also be helpful to someone with a bit more experience who is wondering about starting a nursery. The second chapter provides basic information about collecting, processing, storing, and treating seeds. Chapter three focuses on using seeds to grow plants in the field or in containers using simple but effective techniques. For those native plants that reproduce poorly from seeds, the fourth chapter describes how to start native plants from cuttings. The final chapter provides valuable information on how to successfully move native plants from the nursery and establish them in their final planting location.

Download (PDF): Raising Native Plants in Nurseries: Basic Concepts (17.2MB)

Nursery Manual for Native Plants: a Guide for Tribal Nurseries

Authors: Dumeroese, Luna & Landis (eds.) Date: 2009

This handbook covers all aspects of managing a native plant nursery, from initial planning through crop production to establishing trials to improving nursery productivity into the future. It was written to assist Native Americans in growing native plants and draws extensively on tribal activities for the many photos and specific examples in the text.

Download (PDF): Nursery Manual for Native Plants: a Guide for Tribal Nurseries (3.7MB)