Thirteen-spotted Lady Beetle © Ethan Maitra

Thirteen-spotted Lady Beetle © Gilles San Martin

Thirteen-spotted Lady Beetle © Pentti Ketola

The Thirteen-spotted Lady Beetle is native to North America. Its wing covers are reddish orange with thirteen black spots in total. This species is found primarily in wet meadows and marshes, lake shores, and flood plains. It feeds on aphids and is most active from May to September.

Status

Native

Listed as Critically Imperiled in the Prince Edward Island; Imperiled in Nova Scotia; Apparently Secure in New Brunswick, Ontario, Saskatchewan, Alberta, Yukon, and the Northwest Territories; and Secure in British Columbia.

This species has been in sharp decline, and its range is shrinking. This may be due to land use changes and the introduction of non-native species, many of which heavily utilize human-altered landscapes.

Last Seen

1913

Fun Fact

Thirteen-spotted Lady Beetle populations have declined over several decades. Scientists believe that introduction and establishment of the Seven-spotted Lady Beetle is one of the primary causes.

Identification

The Thirteen-spotted Lady Beetle is 4.5 to 6.5 mm in length and is oblong in form.

Habitat

Reed beds and marshes. Can also be found in meadows, gardens, and agricultural fields.

General Range

Distribution is holarctic (across the Northern Hemisphere), with one subspecies occurring in North America. In North America, the Thirteen-spotted Lady Beetle range spans from coast to coast, north to Alaska and south to Texas.

Food

Aphids.

Life History

Thirteen-spotted Lady Beetles sometimes aggregate on lake shores before winter hibernation and after they emerge from their overwintering sites. Thirteen-spotted Lady Beetles are active between April and October, and are most frequently encountered between July and August. Average development from egg to adult can take approximately 20 and 28 days, at 31 degrees C and 25 degrees C, respectively.

More Information

You can find more information about Thirteen-spotted Lady Beetles using the following links:

Vermont Distribution

Visit the iNaturalist Observation Map and Occurrence Records to find out where Thirteen-spotted Lady Beetles have been seen in Vermont.