For the past several years, I have been having problems with ground bees on my front lawn which have been getting worse each year to the point that they not only "aerate" the lawn but damage it. They appear in the late spring/early summer and stay for about 4-6 weeks. They tend to be out when the sun shines. Although they fly around a lot, they are not aggressive, even if I mow the lawn over them - they have never stung. Yet, they are taking over a larger and larger amount of my front lawn each year (now about 2/3). I would like to know how I can get rid of them (have them move elsewhere) without using chemicals. Please let me know. Thank you.
Based on your description it sounds like you may be dealing with mining bees. Take a look at our website for photos and more information http://extension.umd.edu/hgic/mining-bees-lawns
If so, there are no easy answers. Mining bees are important pollinators and we do not recommend controlling them. Populations can fluctuate from season to season and they are not aggressive. They like exposed soil and good drainage. You can put out a lawn sprinkler to discourage them and see if they relocate.
Since activity is brief about several weeks it is best to tolerate them. After their activity is over rake the area if need be and take the opportunity to overseed in the fall to thicken up your turf. With a thick turf they are less noticeable and may move on as it will be harder to dig. See the attached publication for more information http://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG104_Mini...