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From the UC Blogosphere...

The Butterfly and the Bee

An alfalfa butterfly, Colias eurytheme, sips nectar from an African blue basil blossom. (Photo by Kathy Keatley Garvey)

It's a strikingly beautiful insect. But in its larval stage, the alfalfa butterfly, Colias eurytheme--also known as the...

An alfalfa butterfly, Colias eurytheme, sips nectar from an African blue basil blossom. (Photo by Kathy Keatley Garvey)
An alfalfa butterfly, Colias eurytheme, sips nectar from an African blue basil blossom. (Photo by Kathy Keatley Garvey)

An alfalfa butterfly, Colias eurytheme, sips nectar from an African blue basil blossom. (Photo by Kathy Keatley Garvey)

A honey bee shadows an alfalfa butterfly, Colias eurytheme, on African blue basil. (Photo by Kathy Keatley Garvey)
A honey bee shadows an alfalfa butterfly, Colias eurytheme, on African blue basil. (Photo by Kathy Keatley Garvey)

A honey bee shadows an alfalfa butterfly, Colias eurytheme, on African blue basil. (Photo by Kathy Keatley Garvey)

Two can get along: the alfalfa butterfly and the honey bee. In its larval stage, this butterfly is a pest. (Photo by Kathy Keatley Garvey)
Two can get along: the alfalfa butterfly and the honey bee. In its larval stage, this butterfly is a pest. (Photo by Kathy Keatley Garvey)

Two can get along: the alfalfa butterfly and the honey bee. In its larval stage, this butterfly is a pest. (Photo by Kathy Keatley Garvey)

Posted on Tuesday, October 8, 2019 at 9:00 AM

A Worthy Cause: A Water Bear Sculpture

An artist's sketch of the proposed tardigrade sculpture in front of the Bohart Museum of Entomology.

If you're looking for a worthy cause to support during the giving season (and as a bonus, receive a tax deduction), think...

An artist's sketch of the proposed tardigrade sculpture in front of the Bohart Museum of Entomology.
An artist's sketch of the proposed tardigrade sculpture in front of the Bohart Museum of Entomology.

An artist's sketch of the proposed tardigrade sculpture in front of the Bohart Museum of Entomology.

Posted on Monday, October 7, 2019 at 5:00 PM

Sudden Oak Disease (SOD) Still Here

Advice for the Home Gardener from the
Help Desk of the UC Master Gardener Program
of Contra Costa County

Gardener's Request:  We just moved into a 30-year-old house in the East Bay hills, and we expect to stay here a long time. We have numerous oaks and Bay trees on the property. We've heard from neighbors that we should get those trees reviewed by a trained arborist familiar with Sudden Oak Death (SOD), e.g. identification, disposal, and potential danger to other trees in your neighborhood. Can you please recommend sources?

MGCC Help Desk Response:  Thank you for contacting the UC Master Gardener Program Help Desk with your questions about your oak tree and how to identify sudden oak death (SOD).  The links below include information on identification, disposal, and potential danger to other trees in your neighborhood.

Accurate disease diagnosis can be difficult because the symptoms caused by SOD (Phytophthora ramorum) are very similar to those caused by other fungi, insects, or adverse environmental conditions. The only way to confirm a P. ramorum infection is to take a sample and analyze the affected plant tissue in a certified laboratory. Several of the links include guidance on laboratories.

External symptoms of SOD canker development can include the bleeding of a thick, sticky sap. It oozes out of the bark, not from a crack or hole, typically smells like the inside of a wine barrel and is a deep burgundy but can vary in color from nearly black to an amber-orange. This brochure, A Homeowner's Guide to Sudden Oak Death, has a good image of the sap on a coast live oak:
http://www.suddenoakdeath.org/wp-content/uploads/2010/08/Homeowners-Guide-to-Sudden-Oak-Death.pdf

California bay trees are the primary carrier of SOD fungus. You should see symptoms of infection on the leaves if they are infected. SOD shows as leaf spots and usually brown tips surrounded by a yellow halo: https://nature.berkeley.edu/garbelotto/downloads/sod_diagnostic_report_final.pdf

The recommendation is to remove bays within 30' of susceptible oaks. http://nature.berkeley.edu/garbelottowp/?p=1063

Here are some local contacts with local links for more information and possible tests of your trees:

The SOD Blitz Project informs and educates the community about Sudden Oak Death, gets locals involved in detecting the disease, and produce detailed local maps of disease distribution. The map can then be used to identify those areas where the infestation may be mild enough to justify proactive management:
http://nature.berkeley.edu/garbelottowp/?page_id=148.

California Oak Mortality Task Force for information and how to find arborists they have trained to identify and sample for SOD infection:http://www.suddenoakdeath.org/ 

Contra Costa County
Department of Agriculture
2380 Bisso Lane
Concord, CA 94520
Phone: 925-608-6600

And, finally, here is the link to the UC Pest Note with even more detailed information about SOD:
http://ipm.ignore.edu/PMG/PESTNOTES/pn74151.html

Best of luck to you!

Regards, 
Help Desk of the UC Master Gardener Program of Contra Costa County (SLH)
Note: apologies... an earlier posted version required a minor editorial change for clarity.


Notes: Contra Costa MG's Help Desk is available almost year-round to answer your gardening questions. Except for a few holidays (e.g., last 2 weeks December), we're open every week, Monday through Thursday for walk-ins from 9:00 am to Noon at 2380 Bisso Lane, Concord, CA 94520. We can also be reached via telephone:  (925) 608-6683, email: ccmg@ucanr.edu, or on the web at  http://ccmg.ucanr.edu/Ask_Us/MGCC Blogs can be found at http://ccmg.edu/HortCoCo/ You can also subscribe to the Biog.

Posted on Monday, October 7, 2019 at 12:15 AM

John Mola: The Ins and Outs of Bumble Bee Movement

A yellow-faced bumble bee, Bombus vosnesenkii, heads for a California golden poppy. (Photo by Kathy Keatley Garvey)

It's all about the bumble bees... And now doctoral candidate John Mola of the Neal Williams lab, UC Davis Department of...

A yellow-faced bumble bee, Bombus vosnesenkii, heads for a California golden poppy. (Photo by Kathy Keatley Garvey)
A yellow-faced bumble bee, Bombus vosnesenkii, heads for a California golden poppy. (Photo by Kathy Keatley Garvey)

A yellow-faced bumble bee, Bombus vosnesenkii, heads for a California golden poppy. (Photo by Kathy Keatley Garvey)

UC Davis doctoral candidate John Mola stands by his first-place poster at the 2018 UC Davis Bee Symposium. (Photo by Kathy Keatley Garvey)
UC Davis doctoral candidate John Mola stands by his first-place poster at the 2018 UC Davis Bee Symposium. (Photo by Kathy Keatley Garvey)

UC Davis doctoral candidate John Mola stands by his first-place poster at the 2018 UC Davis Bee Symposium. (Photo by Kathy Keatley Garvey)

Posted on Friday, October 4, 2019 at 3:07 PM

Wild Mock Orange

Photo by Jutta Thoerner

    Wild Mock Orange By Jutta Thoerner  UCCE Master...

Posted on Friday, October 4, 2019 at 10:57 AM

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