Advice needed on huge bee and ant invasions in my yard.

[csziggy]

6. Bumble bees WILL sting if their nests are disturbed

My worst stings ever were from bumble bees that got me four times on one ankle - the entire leg was so swollen I thought the skin would split. Normally bumble bees do not get agitated but my husband and I had been digging post holes within a few feet of their ground nest, not knowing they were there. What with the pounding the entire nest got upset and came boiling out. I was standing closest and they got me twice before I could move, then chased me 200 yards to get me the other two times.

I do agree with you that large yellow and black bees are likely bumble bees and they will nest in holes in trees as well as in the ground and in buildings.