Rhinoceros Beetle & Their Management
Professor Paras Nath
College of Agriculture, Fisheries & Forestry
Fiji National University
Rhinoceros beetle is mainly a
pest of coconut and oil palms.
The beetles damage palms by
boring into the centre of the
crown, injuring the young
growing tissues and feed on the
As they bore into the crown,
they cut through the
developing leaves. When the
leaves grow out and unfold,
the damage appears as V-
shaped cuts in the fronds or
holes through the midrib.
Eggs are laid and larvae develop in
manure pits or other organic
matter and hatch in 8-12 days.
The larvae stage takes another 82-
207 days before entering an 8-13
day non feeding prepupal stage.
The pupal stage lasts for 17-28
Adults remain in the pupal cell for 17-
22 days before emerging and flying to
palm crowns to feed. They are active
at night and hide in feeding or
breeding sites during the day.
Mostly mating takes place at the
breeding sites. Adults may live for 4-9
months and each female lays 50-100
eggs during her lifetime.
Chop and burn decaying logs or break
them up and destroy any adult
beetles developing inside. Cut stumps
as close to the soil surface as possible.
A hooked wire can be used to extract
and destroy rhinoceros beetle adults
feeding in coconut trees.
The fungus, Metarhizium
anisopliae can be applied in
manure pits at 4 kg / tonne
to control the grubs that feed
on the decaying matter.
Apply mixture of neem seed kernel
powder + sand (1:2) at150 g per
palm in the base of the 3 inner
most leaves in the crown
Place phorate 10 G 5 gm mixed
with sand in two inner most leaf
axils for 2 times at 6 months'
Place some napthalene balls
at leaf axil at the top of the
Use pheromone traps with
rhinolure @ 12/ha for
trapping the adults and
Treat the longitudinally split
tender coconut stem and
green petiole of fronds with
fresh toddy and keep them in
the garden to attract and
trap the beetles.