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Pulling/cutting needles (which procedure is appropriate depends on the pine species) is a technique used to balance vigor and induce back budding on a tree that has been in training for some time. It is similar to defoliating a deciduous tree in that it is a stressor, and reduces overall vigor and growth. At this stage of the game, I wouldn't worry about needle plucking. Rather, focus on keeping the trees healthy.
Dave
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