In New Zealand, there are four known species of Privet, including: Tree Privet (Ligustrum lucidum), Chinese privet (Ligustrum sinense), Californian privet (Ligustrum ovalifolium) and Common Privet (Ligustram vulgare). These are tall shrubs or small trees which spread by means of thousands of blue-to-black berries that form after flowering. Berries are generally spread by fruit-eating birds.
Cut established trees close to the ground and paint immediately with a solution of Yates Woody Weedkiller Concentrate mixed at the recommended strength. Watch carefully for re-growth. Trimming the plants immediately after blooming will help prevent the development of a large proportion of the seeds.