I read at LSUAg that winter tilling can reduce problem insects in the soil. Our soil is about to freeze up, so I turned a few beds that had problems last year. My sweet potatoes were badly damaged by wire worms and other unidentified things. My carrots had root maggots. (Now that I think again, the carrot problem is from flies - not a soil issue. I'll use row cover on them next year.) But the sweet potato bed had soil problems. I won't plant them in that same bed next year. Maybe they can go in the winter tilled carrot bed. I'll do what I can to build up good soil structure this spring. Beneficial nematodes, lots of compost, fish emulsion, biochar, etc.