Twenty-spotted Lady Beetle © Jason Michael Crockwell

Twenty-spotted Lady Beetle © Jason Michael Crockwell

Twenty-spotted Lady Beetle © Tom Murray

The Twenty-spotted Lady Beetle is native to North America. This species feeds primarily on fungus, especially mildews. It’s usually found at the base of Skunk Cabbage plants in the early spring, moving to any plant with powdery mildew on it in the summer and early fall. Its spot pattern varies, however its overall color is usually pale with dark or multi-colored spots.

Status

Native

Listed as Vulnerable in Indiana; Imperiled in Saskatchewan; Apparently Secure in Alberta, Manitoba, Ontario, and Newfoundland; and Secure in Nova Scotia, New Brunswick, and British Columbia.

Last Seen

2020

Fun Fact

Another common name for the Twenty-spotted Lady Beetle is the “Wee-tiny Ladybug”.

Identification

Twenty-spotted Lady Beetles are 1.75 to 3.0 mm in length.

Habitat

Twenty-spotted Lady Beetles will occur on any plants that are infected with mildews, from ground level to tree canopies.

General Range

Most of North America, excluding Florida and the northernmost parts of Canada. The Twenty-spotted Lady Beetle’s range does extend into Alaska, however.

Food

Mildews on plant leaves, especially powdery mildew.

Life History

Twenty-spotted Lady Beetles overwinter in small aggregations in leaf litter. In the spring, Twenty-spotted Lady Beetles can be found in groups at the base of Skunk Cabbage plants and in shrubby vegetation. They will then disperse to forage on mildews. Eggs are laid on leaves of plants infected with mildew in small groups.

More Information

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

Vermont Distribution

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