Reduce the amount of tutsan and limit the locations that have it.
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|Production threat||Environmental threat||Public threat|
Tutsan invades regenerating sites, forming dense stands which stop native plant seedlings growing. It prefers wetter, cooler areas and tolerates light shade. Tutsan also readily invades disturbed forest and shrubland, tussockland, bare land and rocklands, roadsides, coastal areas, steep banks, lightly-farmed land and riparian margins including rocky and open streams.
It has become a serious agricultural and environmental pest in the neighbouring Taranaki region and parts of the Manawatu region, and is on the increase in the Waikato. Once established, its patches can dominate farmland especially lower fertile pasture. Although non-toxic, livestock will not eat it.
Tutsan produces a large amount of seed which may be spread by birds, farm machinery, waterways and stock. Roadside mowing may also spread the seed.
Tutsan should not be confused with Japanese honeysuckle (Lonicera japonica). Japanese honeysuckle has foliage which appears similar to tutsan, but it grows as a vine. Its crushed leaves also do not have a ‘curry’ scent.
All landowners/occupiers in the Waikato are responsible for the control of tutsan on their properties and are required to work with Waikato Regional Council in areas where controlprogrammes are in place. Tutsan is also banned from being sold, propagated, distributedor included in commercial displays.
Small infestations can be removed by hand. Dig out small patches of tutsan and take care to ensure that all rhizomes (root-like underground stems) are removed. Do follow up control every few months to remove any remaining rhizomes and prevent reinfestation.
Bury or compost the debris.
Herbicides are most effective on tutsan during spring and early summer while the plants are still fresh and haven’t formed a wax coating. Shaded areas can be sprayed later if the plant is still fresh and hasn’t formed a wax coating to the same extent. Use herbicide at gorse label rates.
|Metsulfuron plus penetrant||Spot spray spring or early summer.|
|Triclopyr plus penetrant||Spot spray spring or early summer.|
|Picloram/triclopyr mix plus penetrant||Spot spray spring or early summer.|
|Picloram granules||55g/m2 of ground covered by the dripline of the shrub.|
|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.|
|If applying herbicide over water, a resource consent may be required. Please check with Waikato Regional Council before you begin.|
After initial control, it’s important to:
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