Hawaiʻi County is continuing to ask residents and businesses to help stop the spread of the coconut rhinoceros beetle (CRB) by avoiding the transport of CRB host materials within parts of West Hawaiʻi covered by a voluntary compliance order.
The voluntary order, initially put in place in June 2025, applies to parts of West Hawaiʻi where CRB has been detected, been extended through April 30, 2026, while the Hawaiʻi Department of Agriculture and Biosecurity (HDAB) drafts interim rules for Hawaiʻi Island.
To stop the spread of CRB, residents and business operators in this area are asked not to transport CRB host materials that include:
- Decomposing plant material such as compost, wood or tree chips, and mulch.
- Plant propagation material.
- Other items, such as landscaping material, that are comprised of decomposing organic plant material.
- All live palm plants in the genera Cocos (Coconut palm), Livistona (Fountain palm or Chinese fan palm), Phoenix (Date palm, Canary Island date palm), Pritchardia (Loulu), Roystonea (Royal palm), and Washingtonia (California fan palm, Mexican fan palm) — except unsprouted seeds of these palms.
Residents and business operators within the compliance area who need to get rid of green waste should take the material to proper disposal sites located at the West Hawaiʻi Organics Facility at 71-1111 Queen Ka’ahumanu Highway and Kealakehe Transfer Station at 74-598 Hale Makai Place. These facilities, located within the compliance area, heat compost piles to at least 131 degrees to kill CRB larvae.
Host materials, such as decomposing plant material, can contain CRB eggs, larvae, and adults. Moving such infested materials outside the compliance area could unintentionally spread CRB far beyond its current range, complicating eradication efforts and hindering control measures.
CRB primarily targets coconut and other palm species. However, it will feed on other important crops such as ʻulu, banana and kalo when the palm food sources are eliminated.
Residents can take the following steps to minimize the risk of spreading CRB:
Inspect and Report
- Inspect CRB host materials at least every 4 months, especially finished compost and nearby host palms, for signs of CRB or damage.
- Examine incoming CRB host materials before accepting them to ensure they are not infested with CRB.
- Collect any suspected CRB and report findings or visible CRB damage to HDAB at 808-643-PEST (7378) or the Big Island Invasive Species Committee (BIISC) at 808-933-3340. Reports can also be made online at 643pest.org.
- Anyone who cannot inspect CRB host materials themselves should contact BIISC, CRB Response (808-679-5244), or HDAB for assistance.
Properly Manage Materials
- Chip incoming CRB host materials within 48 hours.
- Properly compost CRB host materials by heating piles to at least 131 degrees Fahrenheit.
- Monitor finished materials at least every 4 months (visual during turnover). Once compost cools to around 110 degrees Fahrenheit, it can be infested and is a good breeding material for CRB.
- Do not stockpile or keep a mound of CRB host material. Routinely distribute around plants or thinly spread up to 4 inches in depth to enable it to dry completely.
Prevent the Spread
- Utilize or process CRB host materials that are already on-site for end use, eliminating the need to move potentially infested materials.
- Safeguard CRB host materials that have been properly composted or treated in completely sealed containers that prevent CRB entry. Containers made of metal, concrete or glass are acceptable. CRB can chew through many plastics.
- Ensure CRB host materials are still at acceptable temperatures or are subjected to effective treatment before being transported off site.
- Profume, a restricted use pesticide, is one option for treating certain CRB host materials, such as compost. Call HDAB for additional information about the use of this chemical.
- Anyone who receives CRB host materials, must ensure it comes from a reputable source that follows CRB Best Management Practices.
Photo credit: Hawaiʻi Department of Agriculture