in some conditions fire ants will chew through your stalk at the base, they do it in a matter of days too. i had a five foot tall haze topple over and die on me about four years back, dont get me started on termites that suppossedly "dont eat plants" either
to solve the problem then i took a sort of radical solution. i elevated my five gallon pots on a metal wire stand that was then placed into a large pan filled with bleach water, this cut off there route and they killed themselves in the water.