WSU Extension

Pestsense

Lady beetles

(revision date: 1/11/2019)


Use Integrated Pest Management (IPM) for successful pest management.

Biology
There are several species of lady beetles (ladybird beetles, “ladybugs”) that occur in the Pacific Northwest. Many of the species commonly seen in the garden resemble the “classic” lady beetle, with black bodies and conspicuous red to orange wing covers marked with black spots. Other lady beetles may be black and white or even black with red spots. As a group, lady beetles are considered beneficial insects. The adults and larvae of many species feed on small, soft-bodied insects such as aphids, mites, or mealybugs. Besides their obvious coloration, common lady beetle species are distinguished by their characteristic body shape (round to oval), size (most are about 1/4 inch long), their short legs and antenna, and small head. Lady beetle eggs are usually laid on or near plants infested with prey insects. The eggs are spindle-shaped and yellowish to orange in color. They are laid on end (upright) in small clusters, often on the back of leaves, on bark or plant litter. The alligator-shaped larvae are dark gray to blue-gray with orange markings. The black and orange pupae are rounded and often found on leaves. Adults and larvae may occasionally bite humans if handled; however, lady beetle bites are not known to pose any risk to human health. For more information, visit the WSU Puyallup Plant Clinic Pest Leaflet Series, http:puyallup.wsu.edu/plantclinic/pls/, and read PLS 34 "Small Ashy Gray Lady Beetles" and PLS 85 "Lady Beetles". The multicolored Asian lady beetle, a non-native species introduced for pest control, can become a nuisance in homes as adults search for overwintering sites. For more information on this species, see the Multicolored Asian lady beetle page in the Nuisance section of this website. See WSU Publication 'Beneficial Insects, Spiders, and Other Mini-Creatures in Your Garden (EM067E)' by Dr. David James at http://pubs.wsu.edu for more information about beneficial insects.
Management Options

Non-Chemical Management
  • No control measures are necessary or recommended. Lady beetle larvae and adults are important predators of pest insects and should be welcomed to your garden.
  • If lady beetles are encountered indoors, the best method for dealing with them is to gently sweep them up or scoop them up on a piece of paper and place them outdoors.
Select non-chemical management options as your first choice!

Chemical Management
IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides

None recommended.

Images
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Caption: Convergent lady beetle
Photo by: unknown
Caption: Two-spotted Lady Beetle eggs found on the underside of a purple-leafed plum.
Photo by: M. Bush
Caption: Two-spotted lady beetle, Adalia bipunctata, larva.
Photo by: M Bush
Caption: The seven-spotted lady beetle is about 8mm long and was imported from Europe to manage aphids.
Photo by: M. Bush