Why are bumblebees hanging around my patio fence? Do they like rhododenderons?

But I never see them near the rhododendrons..only near the fence...if they will be working on my tomatoes this summer , then they are welcome..but not to build a nest...

Why are bumblebees hanging around my patio fence? Do they like rhododenderons?
Im also thinking what the person above wrote-with some corrections.





Take a look at the fence and see if there are any dime sized holes anywhere in the fence line. If you get close and they are carpenter bees, one or two of the males will come around and try to scare you off. The males DONT sting. Its the females who sting but they're usually inside boring the holes. If you dont see any holes, they arent carpenter bees, but keep an eye on it for awhile just to be sure.





If there are holes, you'll have to buy a special spray to kill them as you'll want to kill all the eggs they're laying inside all the holes they're making. Hornet spray doesnt work! Im includiing one link I used below. While it says to use a dust-we bought a liquid version that they have for sale at Lowes or Walmart.
Reply:They may be wood borers, a type of flying "bee" that resembles a bumblebee, they bore hole is wood about the size of a dime. The males are the ones who sting, but basically they are harmless to plants, b/c they are mainly attracted to wood such as fences, cedar siding, etc. This is a possibility, check with your local pest control company...