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Mexican Bean Beetle
(John Obermeyer, Purdue University)
Common Name: Mexican Bean Beetle

Order: Coleoptera

Family: Coccinellidae

Pest Status: Mexican bean beetles are the only member of this family that is considered a serious pest.

Appearance: The copper-colored adults resemble large lady beetles. They are 1/4-inch long with eight black spots on each wing.

Life Cycle: Adults overwinter and emerge when temperatures increase, usually mid-summer. After feeding, the females lay their eggs on the undersides of foliage. They hatch within a week during warm weather. The larvae feed for two to five weeks before pupating. When pupating, a larva fastens the tip of its abdomen to a part of the plant and sheds its larval skin. The pupal stage lasts for a week before the adult emerges.

Where to Collect: Adults are most commonly encountered on garden and field beans and cowpeas.