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New Zealand Journal of Forestry (1982) 27(2): 219–225
©New Zealand Institute of Forestry

Research article
Long-term control of gorse/bracken mixtures for forest establishment in Nelson.

J. Balneaves and C. Perry

Recent changes in weed control in the Nelson region involve better use of chemicals for desiccation of gorse prior to burning and a move away from post-plant spraying of bracken (Pteridium aquilinum var. esculentum,) to pre-burn spraying with asulam and diesel. Results', although much improved, are such that bracken regrowth may preclude efforts to deal with gorse (Ulex europaeus,) regrowth following burning, though this is not the case in the North Canterbury region. In the Nelson region better control of bracken is needed and it is suggested that the rate of asulam be increased and the use of glyphosate or hexazinone be investigated further.

Based on present knowledge, a series of regimes to achieve either short-term of long-term control of gorse I bracken mixtures are described — e.g., roller crush November, spray with asulam and diesel in late February, and burn late April; six weeks following burning, spray gorse regrowth with 2,4,5-T j picloram and either plant and release spray or conduct a further kill spray of gorse regrowth the following spring or autumn and then plant.

Further subjects for investigation are also listed.

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