Rhinoceros Beetle

What is this

Oryctes rhinoceros

Preferred Trap for this pest

Distribution and bionomics

It is an ubiquitous pest and distributed in all coconut growing countries of the world. The pest also infests Oil palm, Palmyrah palm, wild date palm and ornamental palms. The beetle breeds in decaying organic debris like compost, cow dung pits, saw dust, decaying coconut logs etc. Adults are nocturnal, remain hidden during day time in feeding / breeding sites. The pest occurs throughout the year with peak emergence during June to September

Pest Identification:
The hefty Coconut Rhinoceros Beetle is large and black. An adult male has large horns while a female has smaller, shorter horns. It bores holes into the young, upper fronds of coconut palm trees. It then drinks the sap that is released by the plant's soft tissue. This frond damage reduces coconut production and could kill younger trees. Coconut Rhinoceros Beetles are pests on a variety of other common island plants such as pineapples, bananas, papayas, dates and taro. Larvae feed on mulch and plant debris. The yellowish grubs are also large, growing up to 4 inches long.

The Coconut Rhinoceros Beetle is native to Asia, but migrated to the Pacific Island of Guam sometime in 2007. It has done significant damage to coconut tree populations there. The beetle has now been found on the island of Oahu in the state of Hawaii. Exactly how the beetle arrived on the island is still unclear. Efforts to find, control and, hopefully, eradicate it from the island are now underway. Other Pacific islands infested with the exotic beetle have used deliberate fungal and viral infections to kill adults and stop breeding. Lures and a pest hotline for reporting infestations are a step toward finding and eliminating this new North American destructive pest.

Life Cycle

Damage Crop:
1. Adult beetle bores through unopened spindle leaves and spathes
2. Collar regions of young seedlings are bored by the beetle
3. The pest on an average causes 10% loss in production of nuts