Carpophilus dimidiatus

(Fabricius, 1792)

cornsap beetle, corn sap beetle

Carpophilus dimidiatus, commonly known as the cornsap or corn , is a of sap-feeding beetle in the . It is a stored product pest with documented associations with walnuts and wheat bran. The species has been recorded in Oceania, Europe, North America, and parts of South America including Northwestern Argentina. Laboratory studies have characterized its temperature- and humidity-dependent development and patterns.

Cornsap Beetle (7572942020) by John Tann from Sydney, Australia. Used under a CC BY 2.0 license.Tiny beetle with hitchhikers (7526806834) by John Tann from Sydney, Australia. Used under a CC BY 2.0 license.Cornsap Beetle (7572942514) by John Tann from Sydney, Australia. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Carpophilus dimidiatus: //kɑrˈpɒfɪləs ˌdɪmɪdiˈeɪtəs//

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Habitat

Stored product environments; documented in association with stored walnuts in Northwestern Argentina and reared on wheat bran in laboratory settings.

Distribution

Oceania; Europe; North America; Northwestern Argentina; Azores (Flores, São Miguel, Santa Maria, Terceira); Galápagos Islands.

Diet

Wheat bran (documented in laboratory rearing); stored walnuts (documented association).

Host Associations

  • walnut - pestAssociated with stored walnut products in Northwestern Argentina
  • wheat bran - food sourceUsed for laboratory rearing

Life Cycle

Complete development from to has been observed. Development rates, survival, and patterns vary with temperature and humidity conditions. Specific thermal and moisture requirements have been quantified for laboratory rearing.

Ecological Role

Stored product pest in agricultural and post-harvest contexts.

Human Relevance

Economic pest of stored food products, particularly walnuts. Laboratory studies have examined rearing methods to support research on related .

Similar Taxa

  • Carpophilus truncatusCongeneric pest of almonds and pistachios; distinguished by associations and geographic invasion patterns. C. truncatus was not confirmed until 2020 and has more recently become a major agricultural pest, whereas C. dimidiatus has longer-documented association with stored products.
  • Carpophilus hemipterusCongeneric with similar sap-feeding habits; rearing methods for C. hemipterus on bananas and sand have been adapted for other Carpophilus species.

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Sources and further reading