CORVALLIS — Freshly planted and carefully tended, vegetable gardens can quickly become a magnet for trouble. Problems seem to spring up overnight. Weeds, for instance, can overtake a garden in days.

Do you know why ants never get sick? They have anty bodies. Ants are annoying if they get into the house or make their anthills in places we’d rather they wouldn’t, but they don’t cause many problems ...