PEST ALERT – Diaprepes Root Weevil
Photos: University of California Cooperative Extension (See Additional Resources below)
Distribution: The Diaprepes root weevil (Diaprepes abbreviatus) is currently not present on any Hawaiian islands. Native to Caribbean region, it was introduced into Florida in 1960s. The beetle is established in certain quarantine areas in Southern California (Los Angeles County, Orange County, and San Diego County – certain cities within each county).
Hosts: There are 270 different plants affected by the Diaprepes root weevil, including citrus, avocado, hibiscus, Indian hawthorn, holly, palms, and other ornamentals.
Damage: Chewing damages both leaves and roots of plants. Semi-circular areas are chewed from leaf margins. Grub-like larvae feed on roots, weakening or killing the plant.
Control: Each life stage must be treated with varying pesticides except for pupae stage.
If this pest is found in Hawaii, immediately report to Hawaii Department of Agriculture at 643-PEST, or reportapest.org or bring in samples (in a sealed bag) to HDOA .
”Have you seen this insect?: the Diaprepes root weevil”, University of California Cooperative Extension, October 2007. URL: https://www.cdfa.ca.gov/plant/factsheets/43617_HaveYouSeenThisInsect_DRW_ANR_Oct2007.pdf