Do not be concerned if your youngberry grown in Perth is now (late autumn) showing spots on leaves. This is normal, and the leaves will drop. New leaves will come in the springtime. One task that you do need to stay on top of is picking up the ends of growing shoots (carefully with garden gloves) from the ground to stop them taking root and starting a new plant (unless you want a new plant). Just pick up the flexible and long stems or canes and weave them around the trellis. Come summer they should yield some very tasty berries (or to be pedantically correct, some very tasty drupes).