Wasps deterrent

Wasps are being a real nuisance now, they are looking for food and come buzzing round you when you are trying to have a late summer BBQ.
We have found that by putting out a jam jar with jam smeared round the top and a small amount of water in the bottom attracts them to that and not your food.
They crawl round the top and fall in then drown.

If you would prefer a more humane way to get rid of them, we also found that by burning incense sticks is helpful. They just do not like the smell.
Here is a packet of sticks I bought from a 99p store.

Each separate packet contains 15 sticks!