If you notice a patch of lawn that is slightly shorter, thinner or that looks like it might have been recently mown (but you know it hasn’t been), you could have army worm.
Army Worm or Sod Web-Worm can be really bad news & can attack all sorts of lawns right across Australia. Sadly their favourite lawn is a healthy one.
Lawn grubs are leaf eating caterpillars, the larvae of an adult moth. Lawn grub is a collective term that describe Army Worms, Sod Web-Worms & Cultworms. All of these lawn grubs caause similar issues on your otherwise healthy lawn.