Officials shift approach to sudden oak death

Ten years after initiating a campaign to eradicate sudden oak death in Oregon forests, state officials are moving to Plan B. "There is more to treat now than we have resources to treat," administrator of the Oregon Department of Agriculture's Plant Division Dan Hilburn said at a recent Oregon Board of Agriculture meeting. "The program has to change. There is no way we can treat this as an eradication program." The change in strategy -- from eradication to containment -- comes at a time when the disease is spreading rapidly and funding for controlling it is shrinking. Capital Press Posted: Tuesday, September 06, 2011 10:39 AM

Colourful allure of sudden oak death

Sudden oak death doesn't sound pretty but snap it with the right camera, from the right angle, and it can look alluring. This forest in Cheshire, UK is one that's already known to suffer from sudden oak death, or Phytopthora ramorum. The firm APEM in Manchester used one of only two Leica RCD30 cameras in the world to photograph it from an aeroplane. With the ability to capture visible light and near-infrared, the 60 megapixel, £35,000 camera being tested as a method of diagnosing diseased trees. See it here: http://www.newscientist.com/blogs/shortsharpscience/2011/09/camera-reveals-tree-disease.html

UC Berkeley Research Links Tree Die-Offs to Climate Change

An interesting idea:

Fungus-related plant diseases are wiping out forests across the world – and new research indicates a similar phenomenon emerged as a result of radical climate change some 250 million years ago. That in turn suggests that scourges such as sudden oak death, Dutch elm disease, and the collapse of eucalyptus stands in Australia could be linked to contemporary climate change.

Source: The Bay Citizen (http://s.tt/12YHN)

Agri-fos treatments to prevent SOD spread

Scientists Battle Sudden Oak Death

A swath of uninfected forest on the Peninsula could hold the key to stemming the tree-killing disease

By John Upton

Source: The Bay Citizen (http://s.tt/12RB9)

On a hot summer day in 2008, a pair of plant disease researchers made an extraordinary discovery as they toured a hillside forest in San Mateo County: a stand of trees that had not been infected by the killer disease known as sudden oak death.

The healthy swath of forest, located on watershed lands owned by the San Francisco Public Utilities Commission, is now being used as a laboratory for the largest experiment ever conducted in the wild on a promising preventive treatment for this fast-spreading scourge.

P. ramorum found in Georgia stream

Georgia trees threatened by disease
By April Reese Sorrow
University of Georgia

"In 2005, the Georgia Forestry Commission began monitoring selected Georgia waterways by floating rhododendron leaves in sample bags. They were looking for black spots on the leaves. They found them in 2009.

“We’ve detected the disease in a stream in Forsyth County,” she said. “But we can’t pin down the source. It was repeatedly detected since 2009, and all of the known affected areas have been fumigated. Stream water moves, so it is picking it up all over again from somewhere.”

Pathogens flushed into streams through runoff can lead experts to the source. They’re focusing on streams located in urban areas and around nurseries"

Read the whole article here

USDA funding for P. ramorum related projects

The USDA is allocating $50 million in fiscal year 2011 Farm Bill funding for projects that prevent the introduction or spread of plant pests and diseases that threaten U.S. agriculture and the environment. Of those funds, nearly $2 million will be provided to P. ramorum efforts, including survey and analysis of nurseries in 17 participating states, safeguarding nursery systems, and enhanced mitigation through monitoring the efficacy of treatments in wildland areas. To access the FY 2011 funding plan and list of projects, click here.

From the July COMTF newsletter.

Washington received some of this funding to develop biofiltration systems for reducing inoculum of Phytophthora in nursery water.

New water finds of P. ramorum in Washington

Washington had two new and one repeat P. ramorum-positive waterway detections in June. One of the new positives was detected upstream from a 2010 positive site. The positive stream feeds into the Sammamish River. The other new positive was detected in a watershed sub-basin adjoining the Sammamish River. The repeat detection site has been positive since 2010 and is in a stream that feeds into the Sammamish. While the exact source of the inoculum remains unknown, genetic evidence points toward previously positive nurseries in the associated watershed.

From the July COMTF newsletter