Hawaiʻi’s palm crisis, in plain terms
The coconut rhinoceros beetle (Oryctes rhinoceros) is a large black beetle that bores into the crown (growing point) of palms to feed and breed. As it tunnels, it shreds new leaves before they unfurl, leaving telltale V-cuts, scalloped edges, and 1.5–2” boreholes. Repeated damage can starve a palm, collapse the crown, and kill the tree. Native loulu (Pritchardia spp.), iconic coconut palms, and many ornamental and food-producing palms are at risk.
How we got here—and where CRB is now
CRB was first detected on Oʻahu in December 2013. Despite years of trapping, sanitation, and public outreach, the beetle established across parts of the island. In 2024–2025, detections on Hawaiʻi Island (Waikōloa and then near Kona Airport) confirmed the threat had jumped islands; multiple breeding sites in Kona were located and treated in mid-2025. State and county teams continue targeted treatments and surveys.
Why Hawaiʻi Island is uniquely vulnerable
The west side’s resort corridors and coastal neighborhoods are dense with palms and generate green waste—prime breeding material when piled, chipped, or composted improperly. Warm, dry microclimates speed beetle development. Once CRB finds unmanaged mulch or decaying organic piles, populations can spike locally before visible tree symptoms appear. That’s why new movement rules restrict transporting palm material, mulch, and soil likely to harbor larvae or pupae.
What damage looks like
Early warning signs include:
• V-shaped notches on new coconut fronds
• “Snowflake” scalloping on fan palms
• Conical cuts and frass (chewed fibers) in the crown
• A soft or collapsing spear leaf
Seeing one or more of these—especially in clusters along a street—warrants immediate reporting and inspection. .
Coconut Rhinoceros Beetle in Hawaii
What’s working (and what isn’t)
Most effective: neighborhood-scale sanitation (remove or tarp green waste), targeted insecticides on susceptible palms during outbreaks, crown netting on high-value specimens, and aggressive trapping to monitor populations. Not enough on its own: treating one or two trees while leaving unmanaged mulch piles nearby. CRB management succeeds when communities suppress breeding sites and protect trees at the same time.
What state and county partners are doing
Hawaiʻi’s CRB Response (with HDOA, DLNR, UH, counties, and NGOs) runs detection traps, rapid response teams, canine surveys, and public education. In 2025, Kona Airport palms received repeated treatments, and interagency crews removed breeding sites to slow spread. Expect continued inspections and public compliance efforts as the response shifts between eradication and containment depending on location.
What homeowners, HOAs, and landscapers should do now
- Lock down green waste. Chip finely, solarize under heavy tarps, and avoid long-term piles. Never move suspect material off-site.
- Protect high-value palms. Consider crown netting and timed insecticide programs during active seasons.
- Inspect monthly. Watch for V-cuts and scalloping on new growth; report suspicious damage and beetles immediately.
- Coordinate at the block level. CRB doesn’t respect property lines—neighborhood action is what saves tree canopies.
Our commitment
At Hawaii Tree Protector, we help communities harden their landscapes: site assessments, sanitation plans, palm protection programs, and coordinated monitoring so you’re not fighting CRB alone. If you see symptoms—or simply want to protect signature palms before there’s a problem—reach out. Together, we can keep Hawaiʻi’s skyline green.
