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United States Department of Agriculture

Agricultural Research Service

Title: A New Species of Ericaceas-Feeding Decodes from the Channel Islands and Mainland of Southern California (Lepidoptera: Tortricidae: Cnephasiini)

item Powell, Jerry - ESSIG MUS. OF ENTOMOLOGY
item Brown, John

Submitted to: Pan-Pacific Entomologist
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: January 10, 1998
Publication Date: N/A

Interpretive Summary: Moths in the family Tortricidae attach a variety of U.S. crops and can cause substantial damage and economic loss. Four genera of the tortricid tribe Cnephasiini occur in the New World, two of which, Decodes and Decodina, are endemic to North America. All members of tribe are leaf-rollers or leaf-tiers, and many different plant families are utilized as larval hosts. A new species, Decodes helix, described and illustrated. The new species feeds on manzanita (Arctostaphylos spp.; Ericaceae) and occurs on the California Channel Islands and on the mainland in San Diego County, California, and northwestern Baja California, Mexico. This information will be of use to insect taxonomists, IPM practitioners, and APHIS/PPQ.

Technical Abstract: Decodes helix, new species, is described and illustrated from Santa Rosa and Santa Cruz islands and several sites on the mainland in San Diego County, California, and Baja California, Mexico. It appears most closely related to D. aneuretus Powell on the basis of male and female genitalia, host plant, and seasonal flight period. Decodes helix is distinguished by the long, laterally bent aedeagus and very long, slender, coiled ductus bursae. Larvae were collected from Arctostaphylos confertifolia (Ericaceae) on Santa Rosa Island and A. insularis on Santa Cruz Island.

Last Modified: 4/18/2015