I fought fleas here in central Texas for years with no success. I didn't want to use harsh chemicals both for the dog's sake and the creatures in my yard. I used DE on the dogs and mixed it in with their food but I could never get rid of them.
I didn't know what to do until I learned, and I am not sure where I learned it from, that a mix of DE, salt, and sulphur spread on the yard would kill the fleas and keep snakes away. It worked. The rain dissolved the mix two years ago and the next year, last summer, we had no fleas. None. Even though the neighbors still had them. We still have bugs of all types but the fleas are gone. We have never had any problem with ticks, which is great, and the scorpions are a rare sight.
