Just like people and animals, wasps and bees need water to survive. When the weather heats up, they cool down by drinking water and letting it evaporate off their bodies. Unfortunately, insects can become a major summer nuisance as they crowd pools, ponds and birdbaths. The only way to keep wasps and bees out of the birdbath is to provide an alternate water source--such as a bee bath or pond--that is so appealing they forget about the source that's off limits.
Select a shallow dish for your bee bath. The dish can be a piece of pottery, a pretty plate or even another birdbath. Pick a dish that's blue, white or light yellow if possible--bees and wasps are most attracted to these colors.
Sprinkle gravel or small pebbles in the bottom of the dish. Fill the dish with water, stopping just short of the top of the stones. These rocks will serve as landing spots for the bees, hopefully making this new bath more attractive to them.
Place the bee bath in a quiet part of the yard, away from the birdbath. Drain the birdbath. You can fill it up again later, but the idea is to do everything possible to encourage the bees to seek out the new watering hole.
Obtain a pot, bucket, barrel or other container--basically anything that will hold at least 10 gallons of water. If necessary, line the pond with sturdy plastic. Fill it with water.
Purchase aquatic plants such as water hyacinth or elodea (you can find these and other varieties at most nurseries). Submerge the plants in the pond. Like the stones in the bee bath, the plants will serve as landing areas for wasps and bees.
Place the pond in a quiet, sunny part of the yard away from the birdbath. Drain your birdbath. Keep it empty until the bees seem to have established their new hangout.