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Rose chafer Cetonia aurata (Linnaeus, 1758) (Coleoptera: Scarabaeidae: Cetoniinae)

Rose chafers are beautiful iridescent flower chafers, about 15-21 mm long.
The photos shown below try to illustrate its life cycle. They were all taken by myself in Colchester, Essex, CO3 3AT, UK. Colchester being a remarkable hot-spot for rose chafers.

Click on a picture to see a larger view.


Life cycle
In general, the life cycle of Cetonia aurata takes two years. Note that they pupate in the middle of the summer, overwinter as adults and mate the following spring. For more see a new Life cycle fact sheet.

Ecology
Flower chafers, C. aurata included, are pollen and nectar feeders - they are pollinators. Their larvae develop on decomposing organic matter: wood, wood chips, compost, leafmould and even manure. Plus in places with well composted soil: plant pots, hanging baskets, trenches, etc. They don't seem to do any damage to the plants.
If you have found any larvae in plant pots, before you do anything rash, please refer to my Gardener's Larva Guide to identify them. Are they friend to foe? Root chafer larvae are very different from flower chafer larvae. Rose chafers are our friends!
Unfortunately, there are some websites that state that rose chafer Cetonia aurata adults feed on fresh leaves and that their larvae feed on fresh roots. This is wrong. In particular, it is about time that the mis-information on this page - http://www.arkive.org/rose-chafer/cetonia-aurata/ - was corrected. Unfortunately, it has now been copied and pasted in the Encyclopedia of Life!

Range
In the UK rose chafers are a southern beetle, indeed they seem to like it warm. There is a very good colony in Bristol, for instance. Colchester is an exceptional colony in north-east Essex. For their distribution in Essex, see my paper The Rose Chafer Cetonia aurata L. (Coleoptera: Scarabaeidae: Cetoniinae) in Essex: distribution and some aspects of its ecology.
Perhaps rose chafers are expanding their range. Therefore, all records of adults, and larvae would be very appreciated. Please, contact me if you find any, particularly in Essex, Suffolk and Norfolk!


Links
LA CÉTOINE DORÉE (Cetonia aurata)! (Coléoptère Cetoniidae) - A very informative page by André Lequet who has followed the whole life cycle and is showing pictures of their eggs.
Wikipedia page for Cetonia aurata
Cetonia aurata semiochemical, Pherobase. They do smell very strongly when distressed. Now we know that it probably is anethole.
Rose Chafer – Friend or Foe? Tatnam Organic Patch - An Urban Oasis Wildlife and Organic Garden

References
Chinery M (2005)  Collins Complete British Insects (Collins).
Englund R (1993)  Movement patterns of Cetonia beetles (Scarabaeidae) among flowering Viburnum opulus (Caprifoliaceae). Oecologia 94:295-302.
Fremlin M (2008)  Know Your Chafers, Nature in North-East Essex, 40-45. [PDF]
Fremlin M (2018) The Rose Chafer Cetonia aurata L. (Coleoptera: Scarabaeidae:Cetoniinae) in Essex: distribution and some aspects of its ecology. Essex Naturalist (New Series) 35: 167-178. [PDF]
Jessop L (1987)  Dung Beetles and Chafers (Scarabaeoidea), 2nd ed.
Karolyi F, Gorb SN, Krenn HW (2009)  Trapping pollen by the moist mouth: structure and function of the mouthparts in the flower visiting Cetonia aurata (Scarabeidae, Coleoptera). Arthropod-Plant Interactions 3:1-8. [PDF]
Micó E. and GALANTE, E. (2003)  Biology and New Larval Descriptions for Three Cetoniine Beetles (Coleoptera: Scarabaeidae: Cetoniinae: Cetoniini: Cetoniina, Leucocelina). Ann. Entomol. Soc. Am. 96(2): 95-106.
Micó E. and GALANTE, E. (2003)  Larval morphology and biology of four Netocia and Potosia species (Coleoptera: Cetoniidae: Cetoniinae). Eur. J. Entomol. 100: 131-142.
Micó, E., Juárez, M., Sánchez, A. & Galante, E. (2011)  Action of the saproxylic scarab larva Cetonia aurataeformis (Coleoptera: Scarabaeoidea: Cetoniidae) on woody substrates. Journal of Natural History, 45:41-42, 2527-2542.
Tashiro H (1990)  Insecta: Coleoptera, Scarabaeida Larvae, Soil Biology Guide, Edited by Daniel L. Dindal.

Contact: Maria Fremlin.

Last updated 8 December 2018

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