The monodontomerus wasp, or mono wasp, is a parasitic wasp that can be extremely detrimental to mason bee populations. The mono wasp will insert its ovapositor into the mason bee nests and lay its eggs on the mason bee larvae. Once the young wasps hatch, they will eat the developing mason bees inside of their cocoons.
To avoid predation, we bring our mason bees in at the end of May/ early June and keep them at a controlled temperature inside. Take a look at these photos sent to us by Irvina Mizell of her mason bee cocoons filled with mono wasp larvae and developing wasps.
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