Packer reports that according to Florida officials, a nursery in that state knowingly attempted to sell trees infested with citrus canker out of a quarantined area. The infected trees were detected during an inspection, detained, and sent back to the originating nursery.
A persistent pathogen
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Scientists are wondering: Why does Phytophthora ramorum – the fungus that causes sudden oak death – survive sometimes even if all host material is removed, the area is fumigated and all runoff is ceased? Read more in this Page A-1 story from today’s San Francisco Chronicle.
A P. ramorum breakthrough
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Researchers probing linkages between the two North American strains and the European strain of Phytophthora ramorum – the pathogen that causes Sudden Oak Death – say they have found important clues to their origins. According to a USDA Agricultural Research service press release: Their evidence showed that the European lineage may be older than the […]
Online Phytophthora course now in Spanish
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Since earlier in the year, Oregon State University eCampus has been offering an online course for nursery growers on the management of Phytophthora, a genus of pathogens including the notorious P. ramorum, also known as sudden oak death. The course is free and available to anyone, and participants can try for a certificate of mastery […]
Out-of-state firewood: bad
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Oregon residents are being asked to make sure that if they purchase firewood, that it comes from Oregon. According to Dan Hilburn, administrator of the Oregon Department of Agriculture Plant Division, that’s because firewood often allows diseases and invasive species to hitchhike to new locales, endangering trees and nursery stocks in whole new areas. Officials […]
Chrysanthemum white rust found in Connecticut
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Puccinia horiana, also known as chrysanthemum white rust, was detected at six locations in two counties in Connecticut, the Litchfield County Times (Conn.) reported last week. Additionally, the parasite also was found in Michigan, according to a USDA bulletin. According to the USDA, “Chrysanthemum white rust may be recognized by the small white to yellow […]
Kousa dogwood IDd as P. ramorum host
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USDA APHIS officials indicate they are planning to add the Kousa dogwood, Cornus kousa, to the list of plants that have been identified as hosts for Phytophthora ramorum, the destructive plant pathogen that’s also known as sudden oak death. The species of dogwood will now come under federal regulations designed to combat the spread of […]
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