Holes in Your Yard Could Be Ground-Nesting Bees
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Spring has come early this year and the ground temperatures are warming up with every day. This is a signal to many insects to become active and start foraging for the season. North Carolina is home to more than 500 native bee species and almost 90 percent of them nest in the ground! At the Cooperative Extension Office in Lee County, we received a handful of calls a month about “holes” in folk’s yards where large numbers of bee burrows are congregated together. There is nothing to worry about and you don’t need to do anything! There are bee’s living in your soil, and this is normal and good!
Bees are in the Order Hymenoptera, along with ants and wasps, and scientists usually consider the superfamily Aculeata where most “bees” are located in the family tree. Bee identification in the field can be challenging to even the most seasoned entomologist. Bees are active and can move before all the necessary characteristics, like hairs, vein patterns and leg shapes, are observed. But, entomologists have learned bee behavior through observation and can make educated guesses based on their habits!
North Carolina is home to about 130 species in the family Andrenidae, which is most likely what is starting to emerge from the ground in large aggregations now. Species in the genus Andrena start to become active in February and March, while the species in the genus Calliopsis become active in May and June.
Most bee species nest in the ground, but it is usually bees that nest in logs and stems that get all the press. We leave our stems in the garden for bees to nest in, build hives for honey bees to colonize, and bee hotels in hopes that stem- and long-
nesters will move in. Yet, bare ground where humans have left it alone and the sun can warm the soil is where some of the most important bees will make a home.
Even though the holes are all grouped together the bees themselves are solitary. This means each hole is home to one insect. Females will mate, make a nest in the ground, pack it with pollen and resin, lay her eggs and die. She will not see her offspring. Why they group together is not totally understood, but is hypothesized to be for protection and taking advantage of ideal habitat.
What we can do as land managers is consider intentionally leaving bare ground areas on our property for ground-nesting insects. Observe these areas in the spring and try not to drive heavy machinery over them, especially if you see the tell-tale signs of soil piles next to holes! These bees are not going to swarm and attack, and would prefer to go about their business for their short lives. What perceived aggressive behavior might be a bee just checking you out as you near their nest.
But what about flowers?
Flowers are still critical to these ground-nesting bees, and vice versa! Members of the family Andrenidae are some of the earliest emerging bees in the late winter and
are important for pollinating early flowering species, like our favorite fruit trees! Most bees need both nectar and pollen, and many of them prefer certain species of groups of plants (these are called specialists). Nectar and pollen feed the adult insects, and the pollen is gathered and sometimes combined with other materials to make a bread-like food used to feed the young insects.
Insects of many kinds have been critical pollinators for millions of years, and as humans we sometimes lose sight of the importance of a diversity of habitat types. We delight when we see bees visiting our gardens, but rarely consider where they live when we don’t see them. Humans have been managing honeybees for thousands of years and most modern Americans assume the non-native honeybee, with its social colony and tidy beehive, is what most bees are like. This could not be farther from the truth. As we move into the future, it is critical we consider how unused, untraveled parts of our property could already be home to our favorite pollinators!
How to Manage a Successful Bee Hotel
iNaturalist Data on the Genus Andrena
More Reading- The Bees in Your Backyard, by Wilson and Carril