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Fertilization of Shade Trees 2738
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aerate bark beneficial insects borers branch spread branch system buds cables cambium layer carbon cause cavity filled cement chemical cork Cottony Cushion Scale crotch crowbar crown cut back deadwood decay deciduous deciduous trees develop diseased wood effective elm leaf beetle elms evergreens fastened fibrous roots filling material filling medium foliage frost cracks fungi fungicides fungous diseases girdling roots ground growing healed heartwood heavy hyperparasites inches injurious insects insect pests instances invariably leaf leaves limbs manure maples method moisture mulch natural necessary nitrogen Norway maple number of holes nursery stock oxygen particularly poplar prevent prop roots pruning cuts pruning wounds removed result root system sapwood scale insects shade trees slime flux soil soon species splitting spraying strips Sun scald surface tissues top growth transplanting treated tree expert tree owner tree surgery tree-wound paint Trees suffer trunk type of tree usually waterproof Winter killing wires wood-destroying agents