Coconut Rhinoceros Beetle
Be Vigilant, Act Fast
Protecting Our Island Ecosystem from Invasive Threats
The Coconut Rhinoceros Beetle (CRB) is a highly destructive invasive species threatening Kaua‘i’s native and agricultural ecosystems. These beetles bore into coconut palms and other plant species such hala and banana trees, destroying their ability to grow and reproduce. Left unchecked, CRB infestations can cause widespread damage to vital habitats and local economies.
Signs of CRB Damage
Adult beetles feed on the inner spear or heart of the palm. Using their strong
front legs and horn, they burrow into the palm and suck the juices they
extract. The damage left behind can vary depending on the plant species.
Not just Coconut Trees
CRBs don’t just damage coconut trees—they also pose a serious threat to other palm species and can harm plants like hala and banana by feeding on their growing tissues. As their population grows, so does the risk to Hawai‘i’s broader ecosystem and agricultural crops..
How to Identify CRBs
If you find CRB-
Report Immediately
Follow the steps below to report your findings:
- Note your location and time
- Collect photos, beetles and larvae (if applicable)
- Click the button to the right to report to the 643-Pest team.
High Risk Materials
CRB lay eggs in decaying plant matter but they prefer coconut debris, tree
stumps, mulch, compost, and various gardening materials. CRB larvae (grubs)
have been found in other places like dirt, grass clippings, planter boxes, a dead
root of a living citrus tree, the tops of palms, and leaf litter.
Best Management Practices
Geographic spread of CRB is largely due to human-vectored transportation
through movement of plants and high-risk materials from infested areas. Source
materials from non-infested areas and treat when applicable. Below are resources that cater to specific groups that can help prevent the spread of CRBs.
Additional Resources
For more information, click below.
