my experience four our land and the surrounding area, during several draught years. is when the land dies, other stuff move in . You could see more and more of the big ant mounds in the area. I had a mound pop up on my property at my barn. I put corn starch on the area (was told the ants were soft body creatures and anything that would absorb moisture would hurt them.) If the corn starch hadn't of worked I would of tried the D-earth stuff in hopes to cut their bodies up?) we started seeing ground goffers and parie dogs moving across the open areas here.
When the draught broke, trying to refurbish the soil spreading manuer, putting in earth worms and trying to reseed areas with pasture grass seemed to make a difference.