My name is Dr Margriet Dogterom and am the founder and owner of Beediverse. I write this blog for all who love bees and who want to learn more about these wonderful creatures.

A comment on this blog asked for more pictures on candling cocoons. 

Just today I candled 4000 cocoons.  It seems like an awful lot, but when they are in  petri dishes it is easy to do candle them- about 30 mins or so.  I did see some duds that are of some interest.  I call anything that is not a fully developed bee a ‘dud’.  The percent ‘duds’ in this batch was 2.5%.  Anything under 5% is excellent.  But even with 107 duds there are some interesting ones.  Few had fully developed parasitic wasps- ready to emerge in spring.  Others were bee larvae that had not completed development into an adult. In the next day or so I will take some photos and put them on this blog.

I was teaching a group of people about candling the other day.  It is a straight forward procedure but the conditions have to be right.  The room that you do the candling in has to be completely dark- a bathroom without a window for example.  Any extra light besides the flashlight is too much light and you cannot candle the cocoons.

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3 Responses to Candling cocoons

  • I've candled bantam chicken eggs many years ago to see if they are fertile, but never heard of this.
    Very interesting. Can you tell me what is a petri dish?
    I've had a lot of duds the last couple of years. Disappointing and this year's weather has wreaked havoc with wildlife.

  • Hello! I have candled pet bird eggs before and will now try it out on our Mason bee cocoons this fall. My question is, what does a cocoon with parasitic wasps look like? Is it really distinctive from a bee shape in the cocoon? Thanks! 🙂 Nora

    • yes it is very distinctive. When cocoon is filled with wasps- you can see individual wasps – usually up to 10 per cocoon. The bee inside a cocoon is curled up in a fetal position and looks very different from the parasitized ones.

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