Cooperative Extension San Joaquin County
University of California
Cooperative Extension San Joaquin County

Posts Tagged: thousand cankers disease

Jackson Audley: A Case Study with the Walnut Twig Beetle

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

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,...

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)

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

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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