How do I tell the difference between small white grubs and grape colaspis larvae?
The grape colaspis larva is 1/8 to 1/6 inch in length, slightly curved (comma-shaped), and has a plump, white body with a tan head and prothoracic shield (or plate just behind the head). Its three pairs of legs are short. Bunches of hairs arise from bumps on the underside of the abdomen. Early instars of white grubs are more C- or U-shaped, and they lack the characteristic bumps on the underside of the abdomen. Also, the legs of white grub larvae are relatively long.
