Elm Leaf Beetle Control in Waukesha County, WI

Elm leaf beetles are seasonal invaders in Waukesha County that defoliate elm trees during summer and invade homes for winter shelter in fall. They're yellow-green beetles that aggregate on south-facing walls, similar to boxelder bugs and Asian lady beetles.

Signs of Elm Leaf Beetles

• Yellow-green beetles on walls in fall
• Skeletonized elm leaves
• Beetles emerging on warm winter days
• Aggregations near windows

Common Locations

Prevention Tips

• Treat elm trees in summer
• Seal exterior gaps in fall
• Perimeter treatment in September
• Professional tree and home treatment

Wisconsin Climate Factors

• Fall cooling triggers home invasion
• Presence depends on nearby elm trees
• Warm winter days activate dormant beetles

Seasonal Activity