The USDA Animal and Plant Health Inspection Service is considering proposed rule changes involving wood packaging material used in domestic commerce, such as crates, pallets and sticks. Nurseries commonly use pallets and sticks when shipping plant material, but such wood material unwittingly could transport unwanted and dangerous hitchhikers, such as the emerald ash borer and […]
A persistent pathogen
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— PostedScientists 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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— PostedResearchers 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 […]
Citrus longhorned beetle fears spur federal order
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— PostedThe USDA Animal and Plant Health Inspection Service (APHIS) today issued a federal order (PDF) restricting importation of several plants from several countries (mostly in Asia) due to the threat of the citrus longhorned beetle (pictured; photo courtesy of Wikipedia) and the Asian longhorned beetle. The affected countries include the following: Afghanistan, China, Japan, Indonesia, […]
Online Phytophthora course now in Spanish
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— PostedSince 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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— PostedOregon 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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— PostedPuccinia 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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— PostedUSDA 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 […]
Asian longhorned beetle found in Illinois, Massachusetts
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— PostedIt’s long. It’s distinctive. And it chews dime-sized holes in many species of hardwood trees so that it can lay eggs in them, perpetuating a cycle that leads to infestation and the death of the tree.USDA officials are mobilizing a response after confirming the presence of the Asian longhorned beetle in Worcester, Mass. A resident […]
Emerald ash borer found in two states
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— PostedFor the first time, the emerald ash borer has been detected in Missouri, as well as in Wisconsin. The adult borer doesn’t cause much harm to trees, but in larvae form, it’s a whole different story. The borer larvae consume the inner bark of ash trees, disrupting their vascular systems and causing them to dehydrate […]
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