Mason bee
Mason bee is a common name for bees in the genus Osmia, a group of solitary bees in the family Megachilidae.
Mason bee is a common name for bees in the genus Osmia, a group of solitary bees in the family Megachilidae. They are named for their use of mud to partition and seal nest cells in cavities such as hollow stems, beetle holes, and other small openings. Many species are important early-spring pollinators, especially for fruit trees and other orchard crops.
Description
Mason bees are small to medium-sized solitary bees in the genus Osmia. They are found mainly in temperate parts of the Northern Hemisphere and are known for carrying pollen on the underside of the abdomen rather than on the hind legs like honey bees.
Nesting behaviour
Females build nests in narrow cavities such as hollow stems, beetle tunnels, and holes in wood or masonry. They use mud to separate and seal individual brood cells, which is the source of the common name.
Pollination
Mason bees are valued for pollinating fruit trees and other early-blooming plants. Sources describe them as highly efficient pollinators, and some species are managed for orchard use.
Life cycle and seasonality
Many mason bees emerge in early spring, when temperatures begin to rise, and use available blossoms for pollen and nectar. Their short active season makes them especially useful for early fruit bloom.
Key facts
- Mason bees are solitary bees in the genus Osmia, with more than 350 described species.
- They use mud to build and seal nest cells, giving them the name "mason" bee.
- They do not produce honey or beeswax.
- They are effective pollinators of fruit trees such as apples and cherries.
- They are generally non-aggressive and sting only if provoked.
Mason bees are relevant to Canadian gardeners and orchard growers because they are native or naturalized in parts of North America and are widely used as efficient pollinators for fruit trees in temperate regions, including Canada.
Frequently asked questions
What is a mason bee?
Do mason bees live in hives like honey bees?
Why are they called mason bees?
Do mason bees make honey?
Are mason bees good pollinators?
Do mason bees sting?
References
- Britannica — https://www.britannica.com/animal/mason-beeSupports: Genus Osmia, solitary nature, mud nesting, lack of honey production, general sting behaviour.
- Chesapeake Bay Program — https://www.chesapeakebay.net/discover/field-guide/entry/mason-beeSupports: Size, pollen-carrying method, and importance for pollinating fruit trees.
- National Institute of Environmental Health Sciences — https://www.niehs.nih.gov/health/kids/topics/natural-world/wildlife/insects/mason-beesSupports: Solitary behaviour, nesting in pre-existing cavities, no honey or beeswax, and early spring pollination role.
- U.S. Forest Service — https://www.fs.usda.gov/wildflowers/pollinators/pollinator-of-the-month/mason_bees.shtmlSupports: Orchard bee name, fruit-tree pollination, and managed use in agriculture.
- Oregon State University Extension Service — https://extension.oregonstate.edu/catalog/pub/em-9130-nurturing-mason-bees-your-backyard-western-oregonSupports: General name, mud-based nest construction, pre-existing holes, pollination efficiency, and orchard value.
- The Wildlife Trusts — https://www.wildlifetrusts.org/wildlife-explorer/invertebrates/bees-and-wasps/red-mason-beeSupports: Solitary nesting behaviour, mud-lined cells, seasonal activity, and non-aggressive nature of a mason bee species.