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altitudes areas average bark bole boron deficiency branching pattem breeding programme broadleafs and grasses buds butt logs Califomia Canterbury cause Cedros Cedros Island Certification Service clearwood commercial cones conifers corewood crop crown cuttings dieback Dothistroma Douglas fir early foliage Forest Research Institute forestry fungus genetic improvement Growth and Form growth rate Guadalupe Guadalupe Island habit hazard height growth heritable hybrids Improvement Rating increase Intemode island populations kg/ma less long-intemode malformation Monterey multinodal needles nursery stock occur orchard seed physiological age Pinus radiata pith plantation plantation forestry planting stock pollination produced propagules provenances pruning pulping radiata pine rainfall regimes resin rings root Rotorua seed orchards seedlings seedlot number shelterbelts showing silvicultural snow damage soils South Island species stands Stool-bed tend thinning Thrips timber toppling tree-to-tree variation usually variable vary Vegetative propagation Volcanic Plateau wide wind damage windthrow wood density wood properties young trees Zealand Zealand Forest Research