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Table 3 Summary of first-year vegetation control operations by each respondent for different regions showing: 1) the method of application (% of area managed with either aerial application or spot weed control), 2) the use rate per hectare of major active ingredients assuming broadcast (aerial) application to keep equivalence across regions and, 3) the diameter of the spot, where applicable

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

Region

Application method

Quantity of herbicide used

Spot diameter (m)#

Aerial

Spot

terbuthylazine

hexazinone

 

(% area)

(% area)

(kg ha-1)

(kg ha-1)

 

Northland

50

50

7.0

1.8

2.0

Bay of Plenty

0

100

7.2

1.8

1.8

Taupo

100

0

6.8

1.7

-

Gisborne

100

0

6.0

1.5

-

Hawkes Bay

50

50

7.0

1.8

1.4

Hawkes Bay

0

100

6.0

1.5

1.3

Nelson

40

60

6.0

1.5

1.5

Nelson

0

100

8.0

2.0

1.8

Nelson

0

100

9.2

2.3

2.0

Marlborough

20

80

8.0

2.0

2.0

Canterbury

0

100

6.0

1.5

2.0

Canterbury

94

6

7.0

1.8

-

Southland

70

30

8.0

2.0

1.4

Average

42

57

7.0

1.8

1.7

  1. #The amount of active ingredients applied for an area where spot weed control is used would be reduced proportionately (see Table 4).
  2. Note: two responses were excluded from the table as they were related to regions where terbuthylazine and hexazinone were not used exclusively.