Posts Tagged: Geosmithia morbida

Jackson Audley: A Case Study with the Walnut Twig Beetle

So tiny and so destructive. It's about the size of a grain of rice but it's a killer. That's the walnut twig beetle, Pityophthorus juglandis, which in association with a newly described fungus, Geosmithia morbida, causes thousand cankers disease, wreaking havoc on native black walnut...

The walnut twig beetle is about the size of a grain of rice. (Photo by Kathy Keatley Garvey)

The walnut twig beetle is about the size of a grain of rice. (Photo by Kathy Keatley Garvey)

A Thousand Questions about TCD

Researchers have a thousand questions about thousand cankers disease (TCD), the newly discovered disease that kills black walnut trees.Chemical ecologist and forest entomologist of Steve Seybold of the USDA Forest Service, Pacific Southwest Research Station, Davis, Calif., and a faculty affiliate...

Dying Walnut Trees in Davis

THESE DYING WALNUT TREES in Davis, Calif., are victims of thousand cankers disease. (Photo by Steve Seybold)

Walnut Twig Beetle

ELECTRON SCANNING MICROSCOPE image of walnut twig beetle, by Andrew Graves, formerly of UC Davis.

Bad News for Black Walnut Trees

The news is startling, but not totally unexpected.Thousand cankers disease, which infects and kills black walnut trees, has spread from the western United States to the eastern United States.Officials announced Aug. 5 that the disease has been detected in Knox County in east Tennessee. This marks...

Walnut Twig Beetle

TINY walnut twig beetle is cause for concern when a newly described fungus (with the proposed name of Geosmithia morbida), hitches a ride on its back when it bores into black walnut trees. Together they wreak a havoc known as "thousand cankers disease." (Photo by Kathy Keatley Garvey)

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