In the Spring and Fall the bees begin looking for food at the early food sources. This will often be the early and late blooming bushes and trees. The bees are not there to harm you or your loved ones; they are simply there to gather food to feed themselves, the larvae, and most of the hard working Queen Bee!
How do you make them leave? This is not an easy question to answer unless you are willing to cut down your tree/bush to prevent the bees from returning year after year. There is truly no spray to place on the tree/bush that will make them stop coming to find food as they travel up to five miles to locate the nectar.