Looks like a Western Blue Orchard Mason Bee, Osmia lignaria ssp. propinqua, in the 40+ year old Gravenstein apple tree.

#NativePollinators #pollinators #NativeBees #bees #BlueOrchardBee #MasonBee #bee #GravensteinApple #orchard #April18 #pollination #WesternBlueOrchardBee #OsmiaLignariaPropinqua