No information exists on natural enemies for the beetles in southern Africa.
Regularly monitor trees for any suspicious-looking markings, holes and slits.
Create a physical barrier by covering trunks with steel mesh. The mesh should cover the trunks from the surface of the ground to approximately one meter.
Clear weeds from the trunks as the females can use it as a shelter when eggs are laid.
Plant garlic or other herbs which could act as a repellent for these unwanted beetles.
When a fresh hole is found, you can use a piece of wire and stick it into the hole. You can hook the grub out and kill it. Use a sealer, in a paste form, and apply to the hole. This will seal off the hole and prevent further infections.
If you can see areas of expelled sawdust, it's a good indication of where the grub is located. Taking care, use a sharp knife (or gardening tool) to cut vertically through the bark. Once you find the larva, you can insert a long, sharp wire into the hole to ensure the grub is dead. Cover up the burrow and damage with pruning sealant.