Sydney NSW, Australia
Identification request
2018-11-08T16:00:00.0000000Z
   1
A beetle attacking oil palm - Papua New Guinea

Would anyone know what this beetle may be?They were observed damaging mature oil palm fruit bunches.
Thanks
Mark
Kimbe
Papua New Guinea

Posted on user's behalf

Beetles
Papua_New_Guinea
Oil_palm

Responses

   1    0
2018-11-07T18:00:00.0000000Z

What size are they?  They look like Papuana spp. Or female Xylotrupes gideon.

Bob Macfarlane
Ivoro Jonga
POBox 193
Gizo
Solomon Islands
Phone: +677 7135649

Posted on user's behalf
Papuana
Xylotrupes_gideon
2018-11-11T04:41:03.9546123Z
Can you get better photos? My initial reaction is Papuana, I agree with Bob. Were they on the palms or having been stored awaiting collection? Charles
   0
2018-11-08T04:00:00.0000000Z

Hi Bob and Charles,
I rechecked our reference collection again and it appears to be Oryctoderus latitarsus Boisd. I would appreciate any information on the biology of the species (if any available).

Thanks
Mark
 
Posted on user's behalf

Oryctoderus_latitarsus
   2
2018-11-08T14:00:00.0000000Z
Hi Bob and Charles,
The beetle does not appear to be either Xylotrupes or the taro beetle (Papuana). The males and female do not show sexual dimorphism (no pronounced horns). The male and female look about the same, but with the female slightly larger (around 4cm in length). The male is about 3cm long.This is a first record of this beetle attacking oil palm fruit bunches. It does not attack either the fronds or the palm base. I am attaching additional photos of the beetles in copula (female to the left and male to the right) and the beetles causing damage on the fruit bunch (the beetles are congregating at the base of the damaged fruit bunch).Hopefully someone can give a lead to the genus.

Thanks
Mark  

Posted on user's behalf
   2    0
2018-11-09T18:00:00.0000000Z
david.britton@agriculture.gov.au [pestnet]

Hi Mark,
I would agree with your diagnosis of O. latitarsus – I’ve recently found one adult specimen associated with Oryctes rhinoceros larvae in rotting coconut logs, and one adult in base of a moribund sago palm, where there was damage from Rhyncophorus bilineatus. I couldn’t find any other specimens in the NAQS collections, so they mustn’t be all that common. My feeling was that the individuals I collected were not associated with any primary damage to the palms. The larvae are included in the Beaudoin-Ollivier et al.(2000) key to larvae of rhino beetles associated with PNG coconut developments, so there does seem to be some association with palms.

Dave Britton
Senior Entomologist
Department of Agriculture and Water Resources
Building 114, Catalina Crescent, Airport Business Centre, Cairns Airport
Box 96 AAC Cairns International Airport QLD 4870
Phone 07 4241 7860  I  Fax 07 4241 7845  I  Mobile 0476 833 862

Posted on user's behalf
Oryctes_rhinoceros
Rhyncophorus_bilineatus
2018-11-11T12:41:12.0000000Z
Hi all, Just to clarify, these observations were not in Australia – we don’t have either species of beetle here. Cheers, Dave
2018-11-12T14:14:22.0000000Z
Hi David, Thank you very much for the information. They could be breeding within the fallen palm trunks as the infestation is within a replant field. Best regards, Mark Posted on user's behalf
   1    0
2018-11-10T08:00:00.0000000Z

Lastus Kuniata <lkuniata@rai.com.pg>

Dear all,
I found a similar beetle in Solomon Islands mostly associated with coconut rhinoceros beetles. We found these in breeding sites. The beetles prey on larvae of CRB and the larvae crawl on their backs.

Regards
Lastus Kuniata (PhD)
Head of Research & Development - Ramu
New Britain Palm Oil
Ramu Agri Industries Ltd
Gusap Downs
PO Box 2183
Lae, Morobe Province
Papua New Guinea
e-mail     lkuniata@rai.com.pg
phone    +675 4743299 ext 207
D/Line    +675 4743236
mobile    +675 71539386
fax           +675 4743476
website  www.nbpol.com.pg 

Posted on user's behalf
Solomon_Islands
2020-01-08T05:20:56.3554826Z
Dr. Jackson: I am intrigued by Dr. Kuniata's mention of a beetle predator on CRB. I attempted to email him at the address provided, but received a bounceback email that my message was undeliverable. Is anything additional known about this predator? Do you have current contact information for Dr. Kuniata? many thanks keith stokes entomologist Cooperative Research, Extension, and Education Northern Mariana College
   0
2020-01-08T14:00:00.0000000Z

I'll check and get back to you. I will send you his email directly when i find it.