Posts Tagged: painted lady
The painted ladies are on move.
Scores of painted ladies (Vanessa cardui) are now migrating north from their overwintering sites near the U.S. Mexico border.
"Fascinatingly, they arrived in Prescott, Ariz., the same day (as the ones spotted in Benicia)," said butterfly expert Art Shapiro, distinguished professor of evolution and ecology at the University of California, Davis. "I think they're all from south of the border." The annual migration north varies, but can take place as early as late January and as late as mid-April.
The painted ladies spend the winter in the desert, where in the late winter, they breed on desert annual plants, Shapiro says. The adults emerge in February or March and immediately migrate into the Central Valley and foothills, where they breed. Around May, here in the Central Valley, you'll see the caterpillar offspring munching on borage, thistles, fiddleneck and mallows. Then the adults head toward the Pacific Northwest.
"The painted lady moves northward in a generational wave as the season progresses," Shapiro says on his website. "Frequently it disappears altogether from the lowlands in summer. Beginning in August the movement reverses and butterflies head south toward the desert wintering grounds."
"There is no evidence that this species overwinters successfully anywhere in our area, except for very rare individuals maturing in midwinter from really late autumnal larvae."
The painted lady migration may not be as popular as the monarch (Danaus plexippus) migration, but it's fascinating just the same.
Shapiro, who has monitored the butterfly population of California's Central Valley for 42 years, will be speaking at noon on Monday, March 24 on "Ecological Communities and the March of Time" in the Commonwealth Club, 595 Market St., San Francisco. For program detail and registration, please see the club website. His talk is open to the public. For a discount, access the website and use the coupon code, "friendsforshapiro," said spokesperson Chisako Ress (firstname.lastname@example.org).
A female butterfly, a painted lady, nectaring on Spanish lavender on March 8 in the Benicia Community Garden. (Photo by Kathy Keatley Garvey)
Painted lady twists around for a better shot at the nectar. (Photo by Kathy Keatley Garvey)
There it was.
A green caterpillar, aka larva, aka worm, occupied a blanket flower (Gaillardia) last Friday morning in the Häagen-Dazs Honey Bee Haven, a half-acre pollinator garden on Bee Biology Road at the University of California, Davis.
Soon a honey bee from the nearby Harry H. Laidlaw Jr. Honey Bee Research Facility landed on it. And then a Painted Lady butterfly, its wings tattered from predatory attacks, joined the duo.
Well, what WAS that green caterpillar?
We asked butterfly expert Art Shapiro, distinguished professor of entomology at UC Davis. "Well, it's a Noctuid (owlet moth family)," he said. "It may be one of the infinite variety of color forms of the tobacco budworm, Heliothis virescens, which is common right now--the fine lengthwise striations suggest that--but maybe not."
He suggested we contact his colleague, David Wagner, professor of ecology and evolutionary biology at the University of Connecticut.
"I am guessing that it is either Heliothis virescens as suggested by Art or Helicoverpa zea," Wagner said, looking at the photo. "Both equally probable. The former often favors plants with glandular secretory hairs: Solanaceae, geranium, etc."
According to Wikipedia, the Noctuidae or owlet moths "are a family of robustly build moths that include more than 35,000 known species out of possibly 100,000 total, in more than 4,200 genera."
Noctuidae comprises the largest family in Lepitopdera.
Most fly at night. Many are drawn to sugar and nectar-rich flowers. Some head over to the Häagen-Dazs Honey Bee Haven.
As for Helicoverpa zea, it's a major agricultural pest. It's known by various names, depending on what it consumes. When it consumes tomatoes, it's a tomato fruitworm. Cotton? Cotton bollworm. Corn? Corn earworm. And the list goes on.
We thought that perhaps a neighboring praying mantis would take a culinary interest in the worm, but not so.
The Noctuid appeared to a landing strip for honey bees and Painted Ladies (Vanessa cardui). They kept touching down and pulling up.
As Extension apiculturist Eric Mussen of the UC Davis Department of Entomology quipped: "If you're in the middle of the road, you're going to get hit."
Buddies? A honey bee edges toward a Noctuid caterpillar. (Photo by Kathy Keatley Garvey)
If two is company, is three a crowd? Painted Lady, honey bee and Noctuid caterpillar on blanket flower. (Photo by Kathy Keatley Garvey)