Keep privet from affecting nearby land.
Keep privet from affecting nearby land.
|Production threat||Environmental threat||Public threat|
Privet is an evergreen shrub or tree with at least four species found in New Zealand. These include tree privet (Ligustrum lucidum), Chinese privet (Ligustrum sinense), Californian privet (Ligustrum ovalifolium) and common privet (Ligustram vulgare). Both tree privet and Chinese privet are tolerant of drought, as well as cold and wet conditions.
Privet’s leaves and berries are poisonous to animals and people. Its pollen and scent is also believed by some to contribute to respiratory disorders such as asthma and hay fever. However, because research shows privet is not a strong allergen for most people, a positive allergy test is needed before the regional council can require a privet tree to be removed on health grounds.
Privet is also an environmental pest, rapidly invading bush margins and waste areas. Tree privet is capable of crowding out canopy trees in native forests, may impede native seedling germination and can eventually dominate an area of forest. Chinese privet can displace shrubs on the margins of native forests.
Privet is widespread and common in the Waikato region.
Landowners/occupiers in the Waikato must destroy privet on their land if they receive a pest plant notice from Waikato Regional Council (issued when the council receives a positive allergy test for privet from a neighbour), or live in a community initiative area.
The privet causing the problem must be within 50m of the property boundary or within a public amenity area like a park, reserve, playground or walking track.
Privet is also banned from being sold, propagated, distributed or included in commercial displays.
A ‘total control’ rule for privet applies within the ‘community initiative’ areas of Kāwhia, Tuakau, Whatawhata, Ōtorohanga, Te Kūiti, Pirongia, Kihikihi, Orini, Mangatarata, Te Aroha, Waihi and Paeroa. This means all landowners/occupiers in these areas are required to control all privet on their property irrespective of a valid health-related complaint.
With a sharp chisel or axe, make a deep cut into the sapwood at regular intervals around the base of the tree. Immediately saturate the cuts with herbicide.
This can be done all year round. Apply with a paintbrush or low pressure sprayer using a solid cone nozzle. Liberally treat the full circumference and the basal parts of the shrub or tree trunk in a manner that thoroughly wets at least 2-3 times the diameter of the lower stem or trunk, including the root collar area.
This can be done all year round. Cut the tree down, leaving a stump no higher than 5cm above ground level. Immediately paint herbicide over the entire stump surface, including the sides.
This can be done all year round. Holes are drilled sloping into the sapwood at regular intervals around the tree. Inject herbicide into holes. A drench gun or similar can be used.
This can be done all year round. Spraying is more suitable for smaller or seedling plants but also consider hand pulling. Total coverage of leaf surfaces is required for effective control and is most effective when applied in fine weather during privet’s active growing season, which is spring to autumn.
Disclaimer: Any product names mentioned below are not an endorsement nor are they a criticism of similar products not mentioned.
Summary of herbicides and application methods for control
|Triclopyr plus penetrant||Frilling, cut and inject, cut stump treatment,spray application.|
|Triclopyr/picloram mix plus penetrant||Frilling, cut and inject, cut stump treatment,spray application.|
|Metsulfuron plus penetrant||Frilling, cut and inject, cut stump treatment,spray application.|
|Glyphosate plus penetrant||Frilling, cut and inject, cut stump treatment,spray application.|
|X-Tree Basal®||Basal treatment of trunk.|
|Glyphosate gel||Cut stump treatment.|
|Picloram gel||Cut stump treatment.|
|Herbicide rules will apply. You may need to notify neighbours if spraying. The Waikato Regional Plan explains the agrichemical (herbicides) use rule in section 6.2|
After initial control, it’s important to:
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