Psyllid can cause the young leaves of a tree to be pitted, distorted or crinkled. Orthene (NZ) or Shield (NZ) or a similar insecticide can be used to treat this problem. | Psyllid can cause the young leaves of a tree to be pitted, distorted or crinkled. Orthene (NZ) or Shield (NZ) or a similar insecticide can be used to treat this problem. |