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Entomology (Study of Bugs)/praying mantis egg hatching

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Question
I would like to know when the young will emerge from the praying mantis egg sac that has overwintered in my garden.  Somewhere I saw that a certain number of days above a certain temperature was needed, but have not been able to find that again.  Can you help me?
I don't want to miss this.
Thanks!

Answer
Gail,

The exact date of hatch is highly variable and is different for different populations, even within the same species. Your best option may be to enclose the egg sac in a mesh bag and check it every day once the weather starts to get warm. The measure you are referring to is called "degree-days".

Jack DeAngelis  

Entomology (Study of Bugs)

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Jack DeAngelis

Expertise

I can answer questions in any area of entomology (study of insects, spiders, mites, ticks, and other terrestrial arthropods). Contact me about home and garden insects, insects that bite and sting, and insects that damage homes such as carpenter ants and termites.

Experience

20 years as university extension entomologist, now retired; currently publish a website about home and garden insects.

Publications
see www.livingwithbugs.com/resume.html

Education/Credentials
Ph.D. in Entomology

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