NZPPS   ·  Journal home   ·   Past issues  ·  This volume   ·   Previous abstract   ·   Next abstract

New Zealand Plant Protection 68 (2015): 132-138

Field assessment of herbicides to aid establishment of manuka (Leptospermum scoparium)

K.C. Harrington, R.H. Nurhayati and J.P. Millner


Herbicide treatments were assessed in two concurrent experiments for improving the establishment of manuka seedlings (three provenances) transplanted into hillside pastures for honey production. Height and trunk diameters 18 months after planting were still significantly reduced by initial poor control of weeds. Controlling weeds in a patch of 1.0 m diameter gave better manuka growth than doing so in a 0.5 m diameter patch. Two of the more effective treatments were a mixture of glyphosate, simazine and clopyralid applied before planting, and a post-planting application of glyphosate and simazine sprayed while shielding the manuka. A mixture of haloxyfop, clopyralid and simazine applied in August then again in December following planting in July gave no further improvement in manuka growth than when applied only in August. Residues of metsulfuron equivalent to 120 g ai/ha applied just prior to transplanting caused no adverse effects in any of the three provenances of manuka.

Keywords: herbicide tolerance, weed control, manuka, simazine, terbuthylazine, haloxyfop, clopyralid, glyphosate.

Related articles
pdfField assessment of herbicides to release native plants from weeds
K.C. Harrington and S.J. Gregory (2009)
New Zealand Plant Protection 62: 368-373
pdfInitial screening of herbicides tolerated by native plants
K.C. Harrington and H.K. Schmitz (2007)
New Zealand Plant Protection 60: 133-136
pdfFactors affecting the establishment of manuka (Leptospermum scoparium)
D.A. Grant (1967)
Proceedings of the NZ Weed and Pest Control Conference 20: 129-134

Copyright © 2015 New Zealand Plant Protection Society (Inc.).

Please refer to the terms of use.