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Healthy M. rotundata egg on surface of moist provisions
Dry pollen ball without visible egg or young larva.
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If you cut open a cell shortly after the bee completes construction you will see a mass of pollen mixed with nectar, and an egg. The egg hatches, feeds on the provisions, spins a cocoon, and overwinters in the last larval instar. In the spring it pupates and emerges as an adult about the time that alfalfa blooms.