Yellow grubs- What are they?

Hi there,
These may be the beneficial wasps.   The crop of bees this year is terrible as the weather this last spring was awful.
Cheers
Kevin in Tofino

Yes,  the large yellow grubs look like beneficial wasps.  Clean out the rest of the channels, and close up the nesting tray.  Set out with cleaned trays ready for next spring.  Margriet

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