Bee Basics - USDA Forest Service - US Department of Agriculture

Imagine a bunch of grapes; that is what some of the underground solitary miningbee nests look like.Hole-Nesters: Masons and LeafcuttersMembers of several families take advantage of already existing holes. Thesebees use hollow stems or holes made by beetles or other insects in dead wood.Still other bees locate and use rock crevices or surfaces to form their nests. There,they construct brood cells, usually lined up end-to-end in a row, which theyindividually stock one by one to serve as nurseries and growth chambers for thelarvae, pupae, and young adults.Most members of the family Megachilidae, mason and leafcutter bees, are hole(rarely ground) nesters who use certain materials to modify their nest chambers.Some use mud to construct partition walls between adjacent cells and a thickerplug to seal the nest entrance from parasites. These bees are called mason bees.Others cut rounded leaf pieces for the same purpose, to line the inner walls ofthe nest burrow; they are called leafcutter bees. You may have seen those nearlyperfect circles neatly clipped from the leaves of your prize rose bushes. Please,don’t begrudge this housing material to such hard working mothers. Beesrequire more than pollen and nectar; and like birds, they depend uponcollecting nest-building materials and finding suitable habitats in whichto forage and live.A female leafcutter bee(Megachile sp.) transports a cutleaf she will use as liner for herbrood cells. Characteristic cutsmade by these bees in leaf marginsare shown behind.9