What most homeowners are dealing with is the Asian lady beetle rather than the native lady bug — it clusters on light-coloured, sun-exposed walls in fall and can release a yellowish, foul-smelling defensive fluid if disturbed.
Large indoor clusters can stain walls and fabric, and the beetles can bite lightly, which surprises people expecting a harmless native lady bug.
We apply exterior perimeter treatment ahead of the fall cluster season and seal entry points around siding, soffits, and window frames to keep them from moving indoors.
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They're a different, non-native species — larger clusters, a musty odor when disturbed, and a light bite are the main giveaways.
They can stain walls and fabric with a yellowish defensive fluid if crushed, but they don't cause structural damage.
They're drawn to sun-warmed, light-coloured exterior walls, which is usually the south or west side in fall.
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