A weed is a plant considered undesirable in a particular situation, "a plant in the wrong place". Examples commonly are plants unwanted in human-controlled settings, such as farm fields, gardens, lawns, and parks. Wikipedia
a wild plant growing where it is not wanted – Dictionary
While pine plantations are the foundation of a huge commercial forestry industry in New Zealand and a major export earner, wilding conifer ‘weeds’, which are made up of a number of different types of conifers but include commercial timber species like Radiata pine Douglas fir, are a problem affecting large areas of rural New Zealand, farm, recreation and conservation land.
So, it’s logical that forestry pruning loppers, developed for pruning pines in plantation forests, are ideally suited for cutting out wilding conifers while they are a manageable size for easy removal and before they reach coning age.
Up to around 60 mm the trunk can be cut off a ground level using the P100 Pro-Pruner loppers. Note: “most conifers will not regrow if all branches and needle formation below the cut are removed. If the stump is carefully cleared of all branches and needles, herbicide treatment of the stump may not be required.” Doc website
These types of loppers are also idea for removing other problem plants that can quickly spread such as gorse and broom.
Remember, when using a lopper horizontal to the ground the cutting blade should be below the curved (anvil) blade.