- Author: Kathy Keatley Garvey
Throughout the year, we haven't been seeing this species, Pieris rapae, much--and neither has Art Shapiro, UC Davis distinguished professor of evolution and ecology who has been monitoring all the butterfly populations of the Central Valley since 1972. Usually, cabbage whites are quite prevalent. (See his research website.) As you may remember, he sponsors the annual "Beer-for-a-Butterfly Contest." The first person to collect the first cabbage white of the year--in Yolo, Sacramento or Solano counties--receives a pitcher of beer or its equivalent. It's all for scientific research; he's studying the first flights of this species.
But back to the two cabbage whites fluttering in our garden. One seemed quite interested in the other. A suitor?
In one image (below), they both raised their abdomens.
The cabbage white butterfly is also known as the European cabbage butterfly. Shapiro provides interesting information on his website about this species:
"Our only introduced butterfly--from the Old World--this is also one of our weediest, occurring in disturbed habitats from sea level to about 8000.' It even invades riparian woodland and montane coniferous forest habitats in summer. We are not certain how or when it reached our area. We know the species was introduced in southern Canada in the 1850s; the great Lepidopterist Samuel H. Scudder traced its spread, but was unable to resolve the history on the West Coast. It was not in San Francisco in the early 1880s, but was abundant by the time of the earthquake (1906). There is a mysterious specimen sent by the early collector Lorquin to Tryon Reakirt in Philadelphia, which may have been collected at Yreka in Gold Rush days. Was there an early introduction by the Spanish during the Mission Period?"
"In a typical year, after overwinter mortality, numbers of this species rise rapidly to a peak in late spring, exploiting almost unlimited quantities of host plants (weedy mustards). Then all the annual hosts (Brassica and Raphanus) die off by the 4th of July, and the butterfly is forced to contract down to local pockets of hosts that remain green in summer--cultivated Crucifers and Nasturtiums, the perennial mustard Hirschfeldia incana, and the aggressive weed Tall White-Top or Perennial Peppergrass, Lepidium latifolium. This last plant has invaded the western Great Basin, producing virtual monocultures along the Truckee River and other watercourses, and spreading the butterfly into areas where it had been rare or absent not so long ago."
Agriculturists probably wish the cabbage white butterflies would be more absent, as the larvae, known as "imported cabbageworms," are pests of crucifer crops such as cabbage, kale, bok choy and broccoli. (See the Pest Management Guidelines on the UC Statewide Integrated Pest Management website.)
As for the two in our garden this week, the female lingered for a little more nectar. The male butterfly fluttered silently away.
Rejection. Rejection in the butterfly world.
- Author: Kathy Keatley Garvey
...Birds do it, bees do it
Even educated fleas do it
Let's do it, let's fall in love
When Cole Porter wrote “Let's Do It, Let's Fall in Love” in 1928, he wasn't thinking about butterflies. He was thinking of birds, bees and...well, educated fleas. As opposed to uneducated?
“The Birds and Bees” soon became a euphemism for courtship and reproduction. "The Talk."
Well, Cole Porter could have—should have--added "butterflies."
Monarch butterflies. Especially considering the dwindling number of overwintering monarchs along coastal California.
According to a Dec. 8 article in The Guardian, in the 1980s some 4.5 million monarchs overwintered in California, but today the number has dropped to about 30,000. That's a drop of some 97 percent, The Guardian noted.
Earlier, on Nov. 30, the Xerces Society for Invertebrate Conservation (which organizes the Thanksgiving count) reported:
"We currently have preliminary count results from 97 sites, which includes many of the most important overwintering sites. In 2017, these sites accounted for 77% of the total monarch overwintering population, hosting approximately 148,000 monarchs. In 2018, the same sites have only 20,456 monarchs. This represents an 86% decline since last year."
"We will not have final numbers until the count is over and all the data are in and vetted (usually late January)—and we will keep our fingers crossed that other sites are hosting more monarchs."
Speaking of The Birds and The Bees, when migrating monarchs from the Pacific Northwest and inland California were fluttering to coastal California--and some were just eclosing--we encountered a courtship in Vacaville, Calif.
The date: Sept. 29, 2018
- A bird: A metal sculpture nailed to a post.
- Bees: Dozens of honey bees foraging on Spanish lavender beneath the post
- Butterflies: Two monarchs, Danaus plexippus...well...getting acquainted.
- Educated Fleas: No where in sight. (No uneducated fleas in sight, either.)
Sadly, the statistics indicate--with or without educated fleas--a dismal spring for monarchs.