Posts Tagged: UC IPM
As the guests dined on seafood, yellowjackets dined on bits of protein left behind.
The half-filled glasses were there to draw the yellowjackets away from the picnic tables. Don't know what was in the plastic glasses, but whatever it was, it did not kill them. It just slowed them down. A little. They jumped in, swam around, and climbed out.
Yellowjackets (genera Vespula) are pests.
"Defensive behavior increases as the season progresses and colony populations become larger while food becomes scarcer," wrote authors Eric Mussen of Uc Davis and Michael Rust of UC Riverside in the newly updated UC IPM Pest Note, Yellowjackets and Other Social Wasps.
"In fall, foraging yellowjackets are primarily scavengers, and they start to show up at picnics and barbecues, around garbage cans, at dishes of dog or cat food placed outside, and where ripe or overripe fruit are accessible. At certain times and places, the number of scavenger wasps can be quite large."
Yes, indeed. Uninvited guests are likely to join your picnic.
The ones we observed were Vespula pensylvanica, commonly referred to as "meat bees" because they like meat, including the hamburgers, hot dogs and other protein you serve at your picnic and at other outdoor outings. They also like sugary drinks.
An excerpt from the Pest Note:
"Usually stinging behavior is encountered at nesting sites, but sometimes scavenging yellowjackets will sting if someone tries to swat them away from a potential food source. When scavenging at picnics or other outdoor meals, wasps will crawl into soda cans and can sting your lips or the inside of your mouth or throat."
Want to know more about yellowjackets and other social wasps? Access or download the Pest Note.
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)
Where's the best spot for the new residents of my garden?
I acquired two ladybugs last Saturday during the 99th annual UC Davis Picnic Day. Background: as part of the campuswide celebration, the Department of Entomology annually hosts an all-out bugfest at the Bohart Museum of Entomology and at Briggs Hall. And keeping with the Briggs Hall tradition, the UC Statewide Integrated Pest Management Program gifted picnickers with the treasured ladybugs.
Now ladybugs aren't really "bugs"; they're beetles. Neither are they all "ladies"; some have manly qualities. (Gender issues may confuse us, but not the lady and gentlemen beetles.)
A ladybug is a good beneficial insect. It can devour an estimated 5000 aphids in its lifetime (three to six weeks).
So, every year for the past several years, I've adopted two ladybugs, chauffered them home, and tucked them in our garden. "Please eat the aphids," I tell them.
And they do.
They're good at following instructions.
Last year they took up residence in a bed of red roses. This year, they're coming up in the world--a high rise. A tower of jewels (Echium wildpretii) is "home sweet home."
Life doesn't get any better than this if you're a ladybug (and any worse if you're an aphid).
Two ladybugs in a tower of jewels, Echium wildpretii. (Photo by Kathy Keatley Garvey)
Ladybugs exploring the menu. (Photo by Kathy Keatley Garvey)
Hmm, looks like an aphid over there to me. (Photo by Kathy Keatley Garvey)