Cooperative Extension San Joaquin County
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Cooperative Extension San Joaquin County

Posts Tagged: Vespula pensylvanica

Aren't You Supposed to Be Hibernating?

A western yellowjacket, Vespula pensylvanica, flies toward Algerian ivy in mid-December in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

Dec. 22 marked the winter solstice, the first day of winter. But don't tell that to the western yellowjacket, Vespula pensylvanica. It's supposed to be hibernating, not flying. But there it is flying around--and sipping nectar--from flowering Algerian...

A western yellowjacket, Vespula pensylvanica, flies toward Algerian ivy in mid-December in Vacaville, Calif. (Photo by Kathy Keatley Garvey)
A western yellowjacket, Vespula pensylvanica, flies toward Algerian ivy in mid-December in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

A western yellowjacket, Vespula pensylvanica, flies toward Algerian ivy in mid-December in Vacaville, Calif. (Photo by Kathy Keatley Garvey)

A western yellowjacket, Vespula pensylvanica, sipping nectar from Algerian ivy in Vacaville, Calif. in mid-December. (Photo by Kathy Keatley Garvey)
A western yellowjacket, Vespula pensylvanica, sipping nectar from Algerian ivy in Vacaville, Calif. in mid-December. (Photo by Kathy Keatley Garvey)

A western yellowjacket, Vespula pensylvanica, sipping nectar from Algerian ivy in Vacaville, Calif. in mid-December. (Photo by Kathy Keatley Garvey)

Posted on Monday, December 26, 2016 at 2:24 PM

Yellowjacket or Paper Wasp?

A Western yellowjacket, Vespula pensylvanica, sipping water. Note the black antennae. (Photo by Kathy Keatley Garvey)

Western yellowjackets, nicknamed "meat bees" (as opposed to the "vegetarian honey bees") are often misidentified. A recent visitor at a camp in the Sierra Nevada mountain range witnessed a large number of wasps and stinging behavior. They crowded...

A Western yellowjacket, Vespula pensylvanica, sipping water. Note the black antennae. (Photo by Kathy Keatley Garvey)
A Western yellowjacket, Vespula pensylvanica, sipping water. Note the black antennae. (Photo by Kathy Keatley Garvey)

A Western yellowjacket, Vespula pensylvanica, sipping water. Note the black antennae. (Photo by Kathy Keatley Garvey)

A European paper wasp, Polistes dominula, soaking up sun. Note the orange antennae.(Photo by Kathy Keatley Garvey)
A European paper wasp, Polistes dominula, soaking up sun. Note the orange antennae.(Photo by Kathy Keatley Garvey)

A European paper wasp, Polistes dominula, soaking up sun. Note the orange antennae.(Photo by Kathy Keatley Garvey)

This is a European paper wasp nest tucked inside a shrub. Yellowjacket nests are often in abandoned rodent nests. (Photo by Kathy Keatley Garvey)
This is a European paper wasp nest tucked inside a shrub. Yellowjacket nests are often in abandoned rodent nests. (Photo by Kathy Keatley Garvey)

This is a European paper wasp nest tucked inside a shrub. Yellowjacket nests are often in abandoned rodent nests. (Photo by Kathy Keatley Garvey)

Posted on Friday, September 2, 2016 at 3:29 PM

Quit Mimicking Me!

This wasp mimic is actually a fly, genus Ceriana. (Photo by Kathy Keatley Garvey)

Last weekend a little critter made its first-ever appearance in our family bee garden. It was neither a grand entrance nor a grand insect.    "A fly!" I thought, as I looked at its knoblike bristle or arista on the end of each antenna....

This wasp mimic is actually a fly, genus Ceriana. (Photo by Kathy Keatley Garvey)
This wasp mimic is actually a fly, genus Ceriana. (Photo by Kathy Keatley Garvey)

This wasp mimic is actually a fly, genus Ceriana. (Photo by Kathy Keatley Garvey)

Davis photographer Allan Jones captured this fantastic  image of the wasp mimic, Ceriana. (Photo by Kathy Keatley Garvey)
Davis photographer Allan Jones captured this fantastic image of the wasp mimic, Ceriana. (Photo by Kathy Keatley Garvey)

Davis photographer Allan Jones captured this fantastic image of the wasp mimic, Ceriana. (Photo by Kathy Keatley Garvey)

This is a Western yellowjacket, Vespula pensylvanic, which looks a lot like the wasp mimic, genus Ceriana. (Photo by Kathy Keatley Garvey)
This is a Western yellowjacket, Vespula pensylvanic, which looks a lot like the wasp mimic, genus Ceriana. (Photo by Kathy Keatley Garvey)

This is a Western yellowjacket, Vespula pensylvanic, which looks a lot like the wasp mimic, genus Ceriana. (Photo by Kathy Keatley Garvey)

This is a European paper wasp, Polistes dominula. A syrphid fly mimics this. (Photo by Kathy Keatley Garvey)
This is a European paper wasp, Polistes dominula. A syrphid fly mimics this. (Photo by Kathy Keatley Garvey)

This is a European paper wasp, Polistes dominula. A syrphid fly mimics this. (Photo by Kathy Keatley Garvey)

Posted on Monday, September 8, 2014 at 6:07 PM

What to Do About Yellowjackets

A yellowjacket entering its nest at an apiary. (Photo by Kathy Keatley Garvey)

The question begged for an answer. "It's yellowjacket time again.  Does anyone have or recommend a good trap?" A Bay Area beekeeper today sought recommendations from ledEric Mussen, Extension apiculturist with the UC Davis Department of Entomology...

A yellowjacket entering its nest at an apiary. (Photo by Kathy Keatley Garvey)
A yellowjacket entering its nest at an apiary. (Photo by Kathy Keatley Garvey)

A yellowjacket entering its nest at an apiary. (Photo by Kathy Keatley Garvey)

A yellowjacket sipping water at an apiary. (Photo by Kathy Keatley Garvey)
A yellowjacket sipping water at an apiary. (Photo by Kathy Keatley Garvey)

A yellowjacket sipping water at an apiary. (Photo by Kathy Keatley Garvey)

Posted on Monday, October 14, 2013 at 9:31 PM

Not What You Want in Your Drink

Yellowjackets are attracted to this plastic container. (Photo by Kathy Keatley Garvey)

On an outing last Saturday to a Marin County restaurant, we spotted half-filled glasses lining a railing near the picnic tables. As the guests dined on seafood, yellowjackets dined on bits of protein left behind. The half-filled glasses were there to...

Yellowjackets are attracted to this plastic container. (Photo by Kathy Keatley Garvey)
Yellowjackets are attracted to this plastic container. (Photo by Kathy Keatley Garvey)

Yellowjackets are attracted to this plastic container. (Photo by Kathy Keatley Garvey)

Close-up of yellow jackets. They soon climbed out and flew away. (Photo by Kathy Keatley Garvey)
Close-up of yellow jackets. They soon climbed out and flew away. (Photo by Kathy Keatley Garvey)

Close-up of yellow jackets. They soon climbed out and flew away. (Photo by Kathy Keatley Garvey)

Posted on Wednesday, August 14, 2013 at 8:00 PM

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