Posts Tagged: black walnut tree

A Sign of the Times: Why This Black Walnut Tree Is Dying

If you've ever walked into the courtyard on the 100 block of E Street in downtown Davis, Calif.,...

Forest entomologists Steve Seybold (right) and Jackson Audley stand by a 150-year-old black walnut tree on the 100 block of E Street. It is dying of thousand cankers disease. (Photo by Kathy Keatley Garvey)

Walnut twig beetles tunnel into branches and trunks of walnut (Juglans) where they create galleries for mating and reproduction. In association with a canker producing fungus, Tthey cause a disease known as thousand cankers disease. This tree is in downtown Davis, Calif. (Photo by Kathy Keatley Garvey)

This massive, 150-year-old black walnut tree on the 100 block of E Street, Davis, is dying of thousand cankers disease. (Photo by Kathy Keatley Garvey)

This massive, 150-year-old black walnut tree on the 100 block of E Street, Davis, is dying of thousand cankers disease. (Photo by Kathy Keatley Garvey)

Posted on Friday, May 24, 2019 at 5:00 PM

Comments: 0

Author: Kathy Keatley Garvey

Tags: Andrew Graves (1), black walnut tree (1), Davis (14), Geosmithia morbida (4), Jackson Audley (7), Pityophthorus juglandis (5), Stacy Hishinuma (3), Steve Seybold (23), thousand canker disease (1), walnut twig beetle (13)

Focus Area Tags: Agriculture, Environment, Innovation, Natural Resources, Pest Management

Killer in Our Midst

There's a killer in our midst, and a chemical ecologist will tell us all about it. The killer:...

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

Comments: 0

Author: Kathy Keatley Garvey

Tags: black walnut tree (0), Steve Seybold (0), thousand cankers disease (0), walnut twig beetle (0)