This is an ideal technique for removing young seedlings less than 50 cm tall. It is best undertaken when the ground is moist.
Most wilding seedlings are vulnerable to grazing for the first 2 years.
Intensive grazing with dry sheep in the autumn is the most effective control option.
The best results are achieved with the more palatable species, ie radiata, ponderosa and contorta.
Suitable tools include jacksaws, pruners, slashers and axes.
Chainsaws or scrubcutters are necessary. On uneven ground it is difficult to cut close enough to the ground to remove all green needles. Any needles or branchlets left must be pulled off by hand, or the stump chemically treated.
This is a useful technique, especially for mature outliers. Use a tomahawk to totally remove a 100 mm ring of bark down to the white wood layer. All the pink and green inner bark must be removed right round the tree.
Can be very successful for young trees less than 1.5 m tall, especially in dense stands before oversowing and topdressing, but it does create an ideal seedbed for reinfestation. Burning alone is not recommended.
Results have been variable, depending on the district, species, and application rates. Consult local experts before using sprays.
General guidelines for spraying:
Containment may be the most practical control option where infestation is widespread, and too costly to remove completely. An infested area is contained behind a ‘no further spread’ zone where trees are not permitted to reach the age of seed production. The ‘contained’ area may be managed for production, recreation or erosion control. Topdressing or grazing the “no spread zone” will greatly reduce wilding maintenance needs.
This species is more shade tolerant than pines and can invade open shrub and forest communities. Be wary of planting Douglas fir adjacent to such vegetation.
Exotic hardwoods such as sycamore, rowan, willow and ash can spread into adjacent areas. Native bush remnants, wetlands and other important environments are vulnerable to invasion by these species and it is prudent to reconsider using them near sensitive areas.
Hardwood weeds should be hand pulled at an early growth stage but felling may be required where larger stems are encountered. Because hardwoods can coppice from cut stumps, a stump treatment should be brushed onto the freshly sawn stump to successfully destroy the root system. Regular weed inspections should be undertaken.
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