Hatching of praying mantis cocoons (2nd posting)

Richard Pavelle rp at world.std.com
Sat Oct 15 06:05:52 EST 1994

I bought some praying mantis cocoons in the spring and most had
hatched by July. Recently, I cut open up one of the cocoons that 
had not hatched, and it is filled with larvae.

Can someone tell me why they did not hatch? What determines
whether it will or will not hatch. Might it hatch if I keep it
in a warm place now or are the larvae likely dead? 


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