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Occasional Invaders: What They Are and How to Control Them

What Are Occasional Invaders?

"Occasional invaders" are pests that normally live outdoors but sometimes enter homes or businesses, especially in search of shelter, food, or moisture. While most are not dangerous, their presence can be alarming, unsanitary, or disruptive.

Common Occasional Invaders

  • Silverfish – Small, fast-moving insects that damage paper, clothing, and books.

  • Earwigs – Brown insects with pincers; attracted to moisture.

  • Centipedes & Millipedes – Found in damp areas; some can bite or cause skin irritation.

  • Crickets – Noisy and damaging to fabrics or paper.

  • Sowbugs & Pillbugs – Crustaceans often found in basements and crawl spaces.

  • Springtails – Tiny jumping insects found in moist soil or bathrooms.

  • Stink Bugs – Shield-shaped insects that release odor when crushed.

  • Ladybugs & Boxelder Bugs – Often invade in large numbers, especially in fall.

  • Spiders – Technically beneficial, but unwelcome indoors.

 Why They Invade

  • Seasonal Changes – Insects seek warmth in fall/winter or moisture in hot/dry seasons.

  • Moisture – Leaky pipes, damp basements, and high humidity attract them.

  • Entry Points – Gaps around doors, windows, vents, and foundations.

  • Light & Shelter – Many are drawn to lights and protected indoor environments.

How to Control Occasional Invaders

1. Seal Entry Points

  • Use caulk or weatherstripping around windows, doors, and foundation cracks.

  • Install door sweeps and repair screens.

2. Reduce Moisture

  • Fix leaky pipes and use dehumidifiers in damp areas.

  • Improve ventilation in basements, crawl spaces, and bathrooms.

3. Keep the Home Clean and Dry

  • Store food in sealed containers.

  • Vacuum regularly, especially around baseboards, corners, and hidden areas.

4. Outdoor Maintenance

  • Keep mulch, leaves, and firewood away from your home’s foundation.

  • Trim vegetation and clear gutters to prevent water buildup.

5. Use Targeted Treatments

  • Residual insecticides and perimeter sprays can deter entry.

  • Sticky traps can monitor and reduce populations indoors.

6. Professional Pest Control

  • A licensed technician can identify entry points, apply long-lasting treatments, and provide year-round prevention plans.

 Quick Fact

Occasional invaders don’t usually reproduce indoors — but their presence can signal entry points or moisture issues that should be addressed.