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I wanted to share some observation about the cycle change from larvae to pupae and what I've noticed helps speed up the process, and to get a discussion with other's ideas about how to accelerate the pupation so that if I want 600 beetles, or 1000 beetles in a tray, I can acquire that number of pupae quickly.
I've noticed that when the larvae have a clean environment (little frass buildup, no dead larvae / pupae) and adequate nutrition and moisture (yeast, carrots) they tend to pupate more quickly. I've also noticed that there seems to be an exponential curve to the number that pupate maybe due to the presence of pheromones of previously emerged pupae. Maybe it's good to leave the larvae and pupae in the same bin so that these pheromones encourage pupation.
I was hearing that a strong magnetic field might have some sort of biological response in mealworms and that it might be possible to get a mass pupation by using something like a cattle magnet in the tray with the larvae.
Do others have additional information about speeding up the transition?