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New Zealand Journal of Forestry Science

Table 5 Estimate of the annual input of herbicides for New Zealand’s planted forest area (1.8 million ha)

From: A survey of herbicide use and a review of environmental fate in New Zealand planted forests

Active

Total annual input (kg)

Annual input (kg ha-1)

Glyphosate

175.0 x103

0.0972

Metsulfuron

5.8 x103

0.0032

Terbuthylazine

179.3 x103

0.0996

Hexazinone

44.8 x103

0.0249

Clopyralid

37.5 x103

0.0208

Triclopyr

3.8 x103

0.0021

Picloram

1.3 x103

0.0007

Total

447.4 x103

0.2485

  1. Estimates of treated area assume 50,000 hectares is restocked annually (New Zealand FOA 2011/2012), and that 50% of these areas are retreated at age class 2, 3 or 4 using standard operational practice (1.5 kg ha-1 clopyralid, 0.15 kg ha-1 triclopyr and 0.05 kg ha-1 picloram). Estimates of herbicide use assume that first-year release is 40% aerial and 60% spot control.
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