Pest guide
Lesser mealworm
Alphitobius diaperinus
- Do you need a pest-control professional?
It depends
Whether professional treatment is needed depends on the extent and circumstances. Possible response: Inspect food, discard infested products and clean.
- Potential harm
Damages feed and grain products and may carry contamination between areas
- What to expect
Possible response: Inspect food, discard infested products and clean. If you are unsure of the species, call and describe what you found before deciding what to do.
Not sure? Call and describe it. Identification by phone is free.

About this species
This entry covers Lesser mealworm (Alphitobius diaperinus). Typical location: Damp feed and grain. Potential harm: Damages feed and grain products and may carry contamination between areas. Possible response: Inspect food, discard infested products and clean.
Facts
- Latin name
- Alphitobius diaperinus
- English name
- Lesser mealworm
- Preferred conditions
- Damp feed and grain
- Life cycle
- Development from egg to beetle takes about a month at 32°C
Response and treatment
Inspect food, discard infested products and clean
Treatment depends on the species, extent and circumstances. Products are not always needed. Any products used are permitted for the intended use in Iceland. Follow their instructions and the pest-control professional’s guidance.
Do you have an unwelcome visitor?
Call and describe it. Advice is free, and one phone call often solves the problem.