From January 1 to June 3, 2015, P. ramorum was reported in 10 nurseries (OR 8, WA 1, VA 1), one commercial landscape (LA), and a botanical garden (WA) in non-quarantine areas.P. ramorum was detected in Camellia (2), Kalmia (1), Mahonia (1), Osmanthus (1), Pieris (10), Rhododendron (40), Viburnum (4), Vinca (2), and soil samples (8). Four of the nurseries ship interstate and are in the USDA APHIS compliance program (started spring, 2014; Federal Order DA-2014-02). The Confirmed Nursery Protocol is underway in all nurseries and no findings were made at trace-forward sites. Detections at the WA botanical garden are in managed landscapes; survey and disinfestation procedures are underway.
Rhododendron and Kalmia samples were collected from two Puget Sound, WA residential landscapes in April as part of a P. ramorum trace-forward investigation from an out-of-state nursery. All samples were negative.
A mature Pieris plant at a Kitsap County, WA botanical garden was found P. ramorum positive. The sample had been submitted to the Washington State University Plant Clinic in Puyallup. Under the direction of the USDA, regulatory sampling was conducted on the suspect Pieris plant, as well as other plants around the botanical garden. Mitigation and management procedures are being identified and put in place to help prevent spread and future introductions of the pathogen into the garden.
Two Washington waterways in Kitsap and Thurston Counties have been found positive for P. ramorum in 2015. Both waterways have been positive in previous years and are downstream from previously positive nurseries. Ten waterways in six counties (Clallam, King, Kitsap, Lewis, Mason, and Thurston) are being monitored this year for the pathogen; no other confirmations have been made.
This webinar will be especially useful to native plant nurseries addressing Phytophthora species. It will be recorded and posted online if you are not able to attend the live session.
A Systems Approach To Producing Healthy Container-Grown Plants
Tuesday, April 28, 2015
10–11 a.m. PDT
Native plant nurseries are becoming increasingly aware of the risk of harboring plant pathogens, especially Phytophthora species, that have the potential to threaten the health of ecosystems. In this webinar you will learn how to apply a systems approach to analyze your nursery production system and identify potential contamination hazards. You will also learn best management practices that will allow you to take corrective action and help ensure the health of your plants. The presenter will be Jennifer Parke, Dept. of Botany and Plant Pathology, Oregon State University.
This webinar is sponsored by the Working Group on Phytophthoras in Native Habitats; the California Native Nursery Network; the University of California Cooperative Extension; and the USDA-Forest Service, Pacific Southwest Research Station.
See below for information about this exciting new citizen science program
My name is Joey Hulbert and I am a forest pathologist in training. I recently completed a MS at Oregon State University and now I am prepping to move to South Africa for a PhD with Dr. Micahel Wingfield at FABI.
For the PhD, we plan to survey the indigenous forests of South Africa for Phytopthora species with the help of the public. We want to create a citizen science program that teaches the public about forest pathology and invites them to help sample the trees in their communities and near-by forests. The PhD will be funded but we are trying to raise support for starting the citizen science program. To do this we have launched a crowdfunding campaign.
I am reaching out to you with hope that you will share this project with your social networks and anyone who may see the value in this project. Please help us spread the word!
The below link will take you to the project. There is a 5-minute video that I put together to summarize the scope and value.
A Phytophthora tentaculata Pest Alert is now available. To date, P. tentaculata has been found infecting plants at three restoration sites – one in Monterey County and two in Alameda County. It has not been found in the soil nor detected on adjacent native vegetation. At the sites, the pathogen has been found on sticky monkey flower (Diplacus [=Mimulus]) and toyon (Heteromeles). Treatment, monitoring, and safeguarding at each location is ongoing to prevent spread.
Phytophthora tentaculata has also been found in five native plant nurseries to date in Butte, Monterey, Placer, and Santa Cruz Cos. on sticky monkey flower (Diplacus aurantiacus), toyon (Heteromeles arbutifolia), coffeeberry (Frangula californica), and Salvia mellifera. All infected plants were destroyed. Nearly 500 samples have been analyzed from native plant nurseries (voluntarily) as well as from additional restoration sites to test for pathogen presence. In response to this situation, numerous native plant nurseries are now implementing best management practices, helping to insure that the best possible quality of plants are being grown. Surveys continue to determine if the pathogen occurs in undisturbed areas, particularly where the native plant nurseries have collected their propagative materials. These are the first detections of this Phytophthora in the US. For more information, contact Kathy Kosta, CDFA, at email@example.com.