Chrysobothris mali

Horn, 1886

Pacific flatheaded borer

Chrysobothris mali, the Pacific flatheaded borer, is a metallic wood-boring beetle in the Buprestidae. It is found in North America, with records from Canada (Alberta, British Columbia, Manitoba, Saskatchewan) and the United States. The has been documented infesting pear fruit in California orchards, representing a novel -plant association established through . It is also associated with walnut orchards in California.

1928. Drawing by W.D. Edmonston of Pacific flathead borer life history. (33341510320) by R6, State & Private Forestry, Forest Health Protection. Used under a Public domain license.

Pronunciation

How to pronounce Chrysobothris mali: /ˌkrɪsoʊˈbɒθrɪs ˈmɑːli/

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Habitat

Lake County, California orchards; walnut orchards in California. The has been found in agricultural settings, specifically fruit orchards.

Distribution

North America: Canada (Alberta, British Columbia, Manitoba, Saskatchewan); United States (California, with specific records from Lake County).

Host Associations

  • Pyrus communis L. 'Bartlett' (Rosaceae) - larval Novel -plant association established through ; larvae found infesting fruit in Lake County, California orchards
  • walnut - Associated with California walnut orchards based on study title

Life Cycle

Larval stage found infesting pear fruit. have been reared from larvae on artificial diet and from larvae left undisturbed in pear fruits, demonstrating the can complete its on pear fruit alone.

Human Relevance

Agricultural pest in California orchards. Larvae damage pear fruit, representing a previously undocumented fruit-feeding for this of insects. produce holes in fruit. The has been the subject of molecular diagnostics and taxonomic identification efforts due to its economic impact.

More Details

Taxonomic Verification

Molecular analysis and taxonomic identification confirmed the identity as Chrysobothris mali Horn, 1886. This verification was necessary due to the unusual nature of the association.

Research Significance

This represents the first documented case of flatheaded borers ( Buprestidae) attacking fruit, as this family had not been previously documented attacking any fruits. The finding generated considerable interest among UC Cooperative Extension , commodity advisors, advisors, and pest control advisers.

Sources and further reading