Deet is the active ingredient that keeps them all away. I read the label for the highest percentage of it, then buy that brand.
Keeping the grass mowed really short helps, but until you get a good freeze, nothing short of chemicals is going to help. Usually allot of chemicals!!!
Here, we have fire ants, which I'm told killed off all the chiggers, but when I've been down towards San Antonio, I was hit hard by the chiggers AND fire ants.
My current first aid solution is Gold Bond. This changes, and I'm not sure why that is. After awhile, what I've been using doesn't do it for me anymore, so I start trying something new.
Wasps are worse!!! Here, we have several types of wasps and they can be pretty scarry. I got hit by one a few weeks ago right between my eyes. I knew the nest was there, but had sort of forgotten about it until I saw them. Even after a dozen of them started flying around, I tried to get closer to see where the nest was. One of them came right at me and got me good!!! By the end of the day, tha pain was gone and I had pretty much forgotton about the sting. Then the next morning, I woke up with the skin under my eyes swollen up so bad that I could barely see. By noon, that was down and I was able to get to the job I was working on.
Good luck,
Eddie