How to Identify Plaster Beetles
Plaster beetles are very small, measuring only 1 to 2 mm in length. Their brown coloration and tiny size make them difficult to spot, especially in dark or hidden areas. Because there are many plaster beetle species, their shape and features—such as antennae—can vary.
Signs of a Plaster Beetle Infestation
Infestations can go unnoticed until large numbers gather. Signs include beetles leaving damp areas and congregating near lights or window sills, especially in the evening or in moist environments.
How to Remove Plaster Beetles
Reducing moisture is critical. Use dehumidifiers and repair any leaks promptly. Ensure air vents are clear to promote circulation. Small infestations can sometimes be managed by vacuuming visible beetles. For larger or recurring infestations, professional pest control is recommended to eliminate the beetles and treat affected areas.
How to Prevent Plaster Beetles
- Ensure new building materials and renovations dry thoroughly to prevent mold growth.
- Dispose of food before mold develops.
- Maintain low humidity levels in basements, crawlspaces, and bathrooms.
- Fix leaks and ensure proper ventilation throughout the home.
Habitat, Diet & Life Cycle
Plaster Beetle Habitat
Plaster beetles thrive in damp spaces where mold or mildew grows. Outdoors, they shelter under rocks or near water sources. Indoors, they prefer basements, crawlspaces, bathrooms, and areas with high humidity or consistent leaks.
Plaster Beetle Diet
Plaster beetles feed exclusively on mold, mildew, and fungal spores. They may also be found in moldy stored food, although they are drawn to the mold rather than the food itself.
Plaster Beetle Life Cycle
Females lay around 10 eggs. At optimal temperatures (around 24°C), they complete their life cycle in about 20 days. Cooler temperatures can extend development to five months. Before becoming adults, larvae pupate as part of their metamorphosis.
Why Do I Have Plaster Beetles?
Plaster beetles are attracted to damp environments with mold or mildew, such as newly plastered buildings, basements, bathrooms, and crawlspaces. Leaky windows, plumbing, and high humidity create ideal living conditions. Their small size and ability to fly allow them to enter homes unnoticed.
How Serious Are Plaster Beetles?
While they don’t damage structures, plaster beetles can infest damp or moldy food, creating unsanitary conditions. Infestations can be hard to detect until the population becomes large. Professional pest control services are often required to fully eliminate the infestation and prevent recurrence.