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Aubrey Moore UG
Coconut Rhinoceros Beetle, Oryctes rhinoceros Coleoptera: Scarabaeidae
A Major Threat to Hawaii’s Coconut and Palm Trees
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Native range: Southeastern Asia
*CRB was introduced throughout the Pacific primarily due to increased sea traffic during World War II.
*Most recently, CRB was discovered in Guam in September 2007.
*Primary damage is caused by adults boring from the petioles of fronds into the crown, cutting through developing leaves, and feeding on the exuded sap.
*The beetle breeds in dead, standing coconut palms killed by pest/ disease/ lightning, and in decaying organic materials, such as compost and sawdust heaps. (Bedford, 1980).
*Eggs hatch in 8-12 days; larvae feed on decaying coconut/palm debris for 82-207 days.
*Prepupal and pupal stage is 25-35 days; adult remains in the pupal cell for 17-22 days.
*Adults live for 4-9 months; each female lays 50-100 eggs.
Coconut rhinoceros beetle (CRB)
egg 1st instar
3rd instar
pupa
(M. Schmaedick 2005 Am. Samoa)
ADULT FEMALE shorter horn than male
fuzzy, orange posterior
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*Primary damage is caused by adults boring from the petioles of fronds into the crown, cutting through developing, unopened fronds, and feeding on the exuded sap.
Coconut rhinoceros beetle (CRB) - Damage Symptoms
V-shaped cut on open fronds.
Similar to
mechanical pruning damage
to unopened fronds
Active adult boring hole in petiole
causing “wet look”
Coconut fibers resulting from adults’ boring
Active adult boring hole thru petiole
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DAMAGE TO EMERGING FROND ON FOXTAIL PALM
EXPOSED COCONUT FIBER CAUSED BY BORING
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Area attacked by adult beetle Site of old adult boring hole
Adult boring hole thru frond petiole Site of old boring holes in trunk
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Symptoms of CRB attack: V-cuts with associated lateral boring thru fronds
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Semi-circular damage caused by boring through folded new terminal growth
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Major breeding site among coconut trimming debris - Asan, Guam
09/13
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Major Breeding Site with all CRB stages - Asan, Guam
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Asan Beach, Guam Dead coconut
tree with CRB
Adults and grubs found in rotting coconut trunk terminal
O9/13
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Most Efficient CRB Trap in Guam
• 50 gal steel barrel filled with rotting coconut debris, live CRB, grubs and aggregation pheromone.
• Ultraviolet LED light over trap.
• Chicken wire allows CRB to enter but not fly out (with spread wings).
UV LED light
Pheromone w/CRB
(Moore & Quitugua, pers. com. 09/13)
UV LED light
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hooded vane trap
Traps with CRB pheromone
Rotting coconut stumps placed beneath trap with
CRB pheromone increases trap efficiency
Trap with chicken wire instead of vane
Guam 09/13
UV LED light plus pheromone increase trap efficiency (Moore & Quitugua, pers. com. 09/13)