Trinity County Cooperative Extension
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Posts Tagged: walnut twig beetle

A World of Scents

They Deal with Scents

“Nature is more a world of scents than a source of noise.” That quote sound familiar? Chemical ecologist Jacques Le Magnen (1916-2002) said that back in 1970.World-renowned organic chemist Wittko Francke (right) of the University of Hamburg, Germany,...

They Deal with Scents
They Deal with Scents

World-renowned organic chemist Wittko Francke (second from right) met with UC Davis researchers following his presentation on Wednesday at a UC Davis Department of Entomology seminar. From left are chemical ecologist Zain Syed of the Walter Leal lab; chemical ecologist and forest entomologist Steve Seybold of the USDA Forest Service, Pacific Southwest Research Station, Davis, and an affiliate of the UC Davis Department of Entomology; Wittko Francke; and chemical ecologist Walter Leal, professor and former chair of the UC Davis Department of Entomology. (Photo by Kathy Keatley Garvey)

Posted on Thursday, December 9, 2010 at 7:10 PM

Bad News for Black Walnut Trees

Walnut Twig Beetle

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...

Walnut Twig Beetle
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)

Posted on Monday, August 9, 2010 at 8:41 PM

Killer in Our Midst

Walnut Twig Beetle

There's a killer in our midst, and a chemical ecologist will tell us all about it. The killer: thousand cankers disease. The victim: native black walnuts. The speaker: Steve Seybold. Seybold (right), a research entomologist with the Chemical Ecology of...

Walnut Twig Beetle
Walnut Twig Beetle

WALNUT TWIG BEETLE, in association with a newly described fungus, can fell a mighty black walnut tree. This photo shows how tiny it is--it's smaller than a grain of rice. (Photo by Kathy Keatley Garvey)

Posted on Monday, May 17, 2010 at 6:48 PM

A One-Two Punch

Tiny walnut twig beetle

When you look at the tiny unassuming walnut twig beetle--it's smaller than a grain of rice--you wonder how it could possibily kill a majestic black walnut tree. By itself, it can't.  But when it's associated with a...

Tiny walnut twig beetle
Tiny walnut twig beetle

WALNUT TWIG BEETLE is smaller than a grain of rice. (Photo by Kathy Keatley Garvey)

Death and destruction
Death and destruction

DYING walnut trees in Davis, Calif., the result of "The Thousand Cankers Disease," caused by a tiny walnut twig beetle in association with an unknown fungus in the genus Geosmithia. (Photo by Steve Seybold)

Posted on Thursday, July 2, 2009 at 6:16 PM

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