Rhopaea canegrubs usually cause typical 1-year type damage.
There are many different types of canegrub. It is important to know which type you have so that the best control method can be used. To identify the grub look at the hair pattern at its tail end (you will need a magnifying glass). Rhopaea canegrubs have a hair pattern of two straight rows, each with about 20 short hairs. Beetles are dark brown, about 21-30mm long, and have a coat of short, fine semi-erect hairs. Males have large feelers made up of 8 segments.
Rhopaea canegrubs have a 1-year or 2-year life cycle depending in the weather.
Beetles do no feed. Females appear not to fly and mate on the ground. Males are strong fliers and are attracted to lights.
Canegrub Identification: Hold the grub with its tail-end facing you and its head pointing towards the ground. The shape, the number of rows of hair, and the number of hairs in the hair pattern (raster) are used for identification.