- Author: Kathy Keatley Garvey
Well, there's good news and there's bad news.
The good news: Art Shapiro found and collected a cabbage white butterfly (Pieris rapae) on Jan. 2, the day after New Year's Day, in a mustard patch along the railroad tracks in West Sacramento, Yolo County. The bad news: it's a 2015 butterfly, not a 2016 one. In other words, it's a fall brood spillover, and the contest is still underway.
Shapiro, distinguished professor of evolution and ecology at the University of California, Davis, sponsors the annual contest as part of his four-decade study of climate and butterfly seasonality.
The contest works like this: The first person finding a cabbage white butterfly within the three-county area of Sacramento, Solano and Yolo--and verified by Shapiro as the first of 2016--will receive a pitcher of beer or its equivalent.
"The cabbage white is typically one of the first butterflies to emerge in late winter," says Shapiro, who launched the contest in 1972. "Since 1972, the first flight has varied from Jan. 1 to Feb. 22, averaging about Jan. 20.”
Although the first flight of the cabbage white has been as late as Feb. 22, Shapiro says it is emerging earlier and earlier as the regional climate has warmed. “There have been only two occasions in the 21st century in which it has come out this late: Jan 26, 2006 and Jan 31, 2011.”
Shapiro, who has monitored the butterfly populations of Central California since 1971, has one of the two largest butterfly databases in the world. He maintains a research website at http://butterfly.ucdavis.edu.
The professor usually wins his own contest because he knows where to look. The butterfly inhabits vacant lots, fields, and gardens where its host plants, weedy mustards, grow.
The cabbage white is regarded as a pest of cole crops (cabbage, kale, Brussels sprouts, cauliflower, radish, horseradish, arugula, canola, mustard, etc.) "It is generally the commonest butterfly in and around urban and suburban areas, and routinely visits gardens," he says.
As for his catch on New Year's Day, Shapiro opted to look for it in West Sacramento (south side of the railroad embankment) where he had seen two cabbage whites on Dec. 22. "There had been two rapae there on the 22nd and at that time I had forecast a potential fall brood spillover into January, as happened in 1990 and 2013 and possibly 2012--there was a long lag time after the last December 2011 record."
New Year's Day, 2016, was overcast. "By 1:20 I had about given up and there were only brief sunny intervals. Then I noticed the triangular white form of a dorsal-basking rapae among dead annual litter! Once I convinced myself that's what it was--not a piece of paper--I caught it. It never took flight and it may have been too cold to do so."
The live catch is now in his Storer Hall lab. "It's an old male, definitely frazzled, the hindwing undersides faded, unambiguously autumn-phenotype and a 2015, not a 2016 bug. So the record goes in the book--first for 2016--but the contest remains open, as in prior spillover years."
Shapiro does not expect the first cabbage white of 2016 "very soon" due to lack of vegetation and inclement weather.
"The vegetation looks terrible," he explained. "There has been very little germination of Crucifers (mustard family) since November. Most of the non-grass seedlings are yellow star thistle and milk thistle; even Conium (carrot famiy) is scarce. There are areas, mainly under standing litter, where nothing has germinated at all."
Rain is forecast for much of the week and next week. "Although it's a sort-of El Nino pattern (lasting maybe through Saturday) and there is a chance of measurable rain every day next week (except Sunday), amounts will not be huge," Shapiro predicts.
The contest rules include:
- It must be an adult (no caterpillars or pupae) and be captured outdoors.
- It must be brought in alive to the department office, 2320 Storer Hall, UC Davis, during work hours, 8 a.m. to 5 p.m., Monday through Friday, with the full data (exact time, date and location of the capture) and your name, address, phone number and/or e-mail. The receptionist will certify that it is alive and refrigerate it. (If you collect it on a weekend or holiday, keep it in a refrigerator; do not freeze. A few days in the fridge will not harm it.)
- Shapiro is the sole judge.
Shapiro has been defeated only three times since 1972. And all by his graduate students. Adam Porter defeated him in 1983; and Sherri Graves and Rick VanBuskirk each won in the late 1990s.
- Author: Kathy Keatley Garvey
Seen any cabbage whites lately?
If you capture one before UC Davis professor Arthur Shapiro does, he'll trade you a beer for your butterfly. Actually, a pitcher of beer or its cash equivalent.
Yes, it's time for Shapiro's 38th annual Butterfly-for-Beer contest. The "state-of-the-Art" rules are easy: the first person to find and capture a live cabbage white butterfly outdoors in California's Central Valley (Sacramento, Solano or Yolo counties) after the first of the year, will win a pitcher of beer. You get the beer, he gets the butterfly. He gets the data, you get the recognition.
Shapiro, a noted lepidopterest equally renowned for his heavily accessed UC Davis butterfly site and field guide about butterflies in the San Francisco Bay and Sacramento Valley regions, almost always finds the first cabbage white of the year. It's tough to beat him because he knows where to look. Most likely the cabbage white will be in a vacant lot or by a roadside where wild mustards grow. It probably won't be in your backyard garden or neighborhood park.
The cabbage white is the Pieris rapae, a white or buff-colored butterfly about 1-1/4 inches long. It sports a black spot or spots near its wing base. The underside of its hindwing is yellow with a grayish cast.
The cabbage white is emerging about a week earlier than it did 30 years ago, Shapiro says. When was the first specimen found in 2008? Jan. 19.
Entries should be delivered to the receptionist in the Evolution and Ecology office, 2320 Storer Hall. Be sure to include when (time and date) you found it and where you found it. If it's on the weekend, when the UC Davis office is closed, store it live for a few days in your refrigerator.
Here's a photo I captured of two cabbage whites in Vacaville, Solano County on Sept. 7, 2008--about eight months too late for Shapiro's competition.
And no beer.