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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.

Illustration: Lesser mealworm (Alphitobius diaperinus), whole animal on a light background.
Alphitobius diaperinus (Lesser mealworm)Based on a photo by: Erling Ólafsson, Náttúrufræðistofnun Íslands

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.