Dennis
are the entomologists reporting more hornet/wasp populations this year?
These are the smaller yellow hornet/wasps that one usually sees around trash cans at picnics/parks. Not the larger cicada killers I think are true yellow jackets.
I am in a "high risk" for insect bites with my work I realize. But in over 25 years I have been stung 5 times by bees/wasp/hornets. In the past 2 weeks I have been stung 3 times by those small yellow hornets.
Wasps have gotten me in the past when I didnt hit evergreens before pruning or when I was cutting down a vine growing on a garage (they had nested in a crack under the eaves and I hadn't noticed them). Hornets have gotten me when I have moved old compost or brush piles in late summer. A honey bee stung me once years ago when I was walking in clover with sandals. But this year all three times I was just walking along in areas I hadn't disturbed and OUCH!

Hornet Populations
Sounds like you have had a string of bad luck with the bees and wasp. You ask a very good question and often times not an easy one to answer. I have not seen any research reports that indicate the population is up so my answer will be more theory.
This spring we had more bee calls about swarms than I can remember in years. Based on the fact that these are all related I would guess that maybe hornets and wasp are also on the increase.
Food, water and habitat are plentiful so maybe all factors have come together and there is a higher than normal population.
Stay safe - Dennis
Thanks and OUCH! I had
Thanks and OUCH!
I had another one almost get me yesterday!
I am more vigilant (probably why it didnt get me). I suggest if working in weedy/brushy areas people tap beds/bushes with a long handled tool first, wait a minute for a response and then work in that area just to be safe.
Or wait till a hard freeze to start clean up.
Ive also noticed more carpenter bees (fortunately for me not at my house).
Good Tips
Carpenter bees have been very busy this summer. Waiting till frost will also help with the mean old hornets. Be safe - Dennis