I use to live in Missouri about 70 miles West of St Louis and when we moved there to our farm I was about 8 ( I remember Mom putting Bleach in our bath water just a little and it did help kill them I would not suggest that however I think back then Mom just didn't have to much of a choice what to help us with) and chiggers were every where cutting the grass and getting rid of the weeds help but I never notice them here in Kansas at least where I'm at we do spray because we live out in the country and bugs can be bad. One thing I would watch is his privates Johnson last year got bit by something on his privates and they started swelling he was on meds for about 2 weeks.