Males like meat for bait and Females like sweet.
They are pretty easy to make. just take a 2L bottle, cut the top off, flip it over, tape it shut, drill or cut holes in the edges so you can hang it where your wasp or hornets are travelling.
Even with soda with no sugar i managed to catch quite a few. with better bait this method works wonders. you will also want to ad some dish soap into the mix. this makes their wings slippery so they can't fly out.