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New treatments for palms and breeding sites are also showing promising results in reducing CRB populations. Public reports of CRB adults, larvae, damage, breeding sites, and adopting CRB green waste management guidelines all support efforts to eradicate CRB. Q: Is it possible to get rid of CRB on Oʻahu?Ī: The CRB Response is working to completely get rid of CRB in Hawaiʻi and we believe that it is possible with the cooperation of public and private entities.

Learn more in our lookalike species blog. Please note that OFB breed in the same kind of material as CRB, so if you find OFB larvae, CRB may be nearby. Although they are a nuisance, their feeding does not seem to harm fruit and flower production. OFB feed on rotting or damaged fruits, and are widespread around Oʻahu. Q: What about the oriental flower beetle (Protaetia orientalis OFB)?Ī: OFB are also non-native but have less impact on the environment compared to CRB. Q: Why don’t you hang traps on coconut trees?Ī: We don’t want to attract beetles to their preferred food source, it is difficult to hang traps on coconut palms, and falling coconuts pose a hazard to our field technicians. CRB are unable to escape this trap because the cup is too slippery to climb and CRB wings are too wide to fly out. The adult beetle flies into the side panel and drops into the cup. If you are concerned about CRB, please consult our green waste management suggestions or contact us.Ī: Traps have a pheromone lure (a chemical substance that triggers a social response in the same species) that attracts CRB. A single trap will not protect palms in the vicinity or catch every CRB. Q: Why do I see the traps everywhere?Ī: The CRB Response monitors all of Oʻahu for CRB, using traps to identify where beetle populations exist and the size of those populations.Ī: Over 3,000 traps are deployed across Oʻahu in strategic locations, at higher concentrations in areas that are infested with CRB. The North Shore of Oʻahu has also seen an increase in detections. Most of the beetles are found in Central Oʻahu and the Waiʻanae Coast, ʻEwa Beach, Iroquois Point, Waipahu, Waikele, Mililani, and Kunia. Hatched grubs are C-shaped and grow to be between 2.3-4.Q: Where have coconut rhinoceros beetles been detected in Hawaiʻi?Ī: The CRB Response’s monitoring and trapping network has only detected CRB on select areas of Oʻahu.

CRB eggs are laid and develop inside rotting coconut logs, mulch or compost piles.

All CRB will have a horn on it’s head, though the male’s horn is more than twice as long as the female’s (see photo above).

Adult coconut rhinoceros beetles can grow to be between 1 t0 2 inches in length and are solid black in color.

CRB also pose threats to all oil palms, pandanus trees, and banana trees.

Threatens the endemic and endangered fan palms, Loulu.

Adults can spread through flight, hitchhiking and in high wind events.

Grubs can be spread through green waste transfer.

The damage to palms and their fronds can outright kill the tree or leave it susceptible to disease.

CRB damaged palm fronds have distinct geometric notching, appearing to have been cut by scissors.

Adult CRB bore into the crowns of coconut palms to eat developing leaves.

So far, CRB has only been detected on the island of Oahu where control efforts are underway. The MoMISC crew actively sets and monitors CRB traps at the Molokai Airport with no captures to report. Coconut Rhinoceros Beetle (CRB) has not yet been detected on Molokai.