Most people call them ladybugs. They’re not. The Multicolored Asian Lady Beetle looks similar to the native ladybug but behaves completely differently — they bite, they stain surfaces with a foul-smelling yellow secretion, and they invade Iowa homes in huge numbers every fall. If you’ve had swarms of orange-and-black beetles crawling all over your south-facing walls in October, you know exactly what we’re talking about. Miller Pest Solutions helps Johnston homeowners deal with Asian lady beetle invasions every year.

Signs of an Asian Lady Beetle Infestation

  • Large swarms on exterior walls in fall — hundreds or thousands of beetles clustering on south- and west-facing siding, especially on warm October days, is the most obvious sign.
  • Beetles around windows, soffits, and vents — they probe for gaps and enter through any opening they find in the building envelope.
  • Yellow staining on walls and fabrics — when disturbed, they release a bitter-smelling yellow fluid (hemolymph) that stains curtains, walls, and window frames.
  • Biting sensation indoors — unlike true ladybugs, Asian lady beetles bite. It’s mild but noticeable, especially if they’re present in large numbers inside.
  • Emergence in winter or spring — beetles that overwintered in walls or attics become active on warm days and emerge into living spaces.

Why Asian Lady Beetles Are Common in Johnston

Asian lady beetles were intentionally introduced across the United States decades ago for aphid control, and they’ve thrived. Iowa’s soybean and corn fields provide enormous summer food sources (aphids on crops), which fuels massive beetle populations every year by late summer.

When fall temperatures drop, those populations converge on structures. Johnston’s homes — especially those with light-colored or south-facing walls, older wood construction, and gaps around windows — are prime targets. The beetles are attracted to light-colored surfaces and warmth, which is why your neighbor’s house might be covered in them and yours isn’t, or vice versa. Once inside wall voids, they overwinter in large clusters. The odor of dead beetles inside walls can attract other pests as well.

Our Asian Lady Beetle Control Process

Timing is everything. Miller Pest Solutions applies exterior perimeter treatments in late September or early October — just as beetles start their fall migration but before they’ve entered the structure. A residual insecticide applied to exterior walls, especially south and west exposures, window frames, soffits, and vents, kills beetles on contact and creates a barrier that deters others.

We also recommend sealing cracks around window frames, door frames, utility penetrations, and attic vents. Exclusion is the permanent solution — treatment keeps populations down year over year.

For beetles already inside, we can treat wall voids and attic spaces. Vacuuming up beetles in living areas is preferable to crushing them, since crushing releases the staining secretion.

Why Choose Miller Pest Solutions

In business since 2001, QualityPro Certified, NPMA member, and led by Joel Miller who’s been hands-on in pest control since 2007. We know Iowa’s fall pest calendar and we treat proactively. We offer free phone bids — call us, describe what you’re seeing, and we’ll give you a straight answer on what it costs and what to expect.

Get a Free Phone Bid Today

Asian lady beetle swarms in Johnston? Call Miller Pest Solutions at (515) 329-8801 for a free phone bid. Early fall treatment is far more effective than trying to deal with beetles after they’re inside your walls. Find us online at millerthekiller.com.