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<pre>Other poss causes may be,

herbicide eg glyphosate can cause splits in bark up to 1/2 years after contact
pathogens within tree entering from unsealed wounds eg pruning, hail
damage, whipper snipper, tractor mowers etc
insufficient chill hours for that cv not kicking off hormones for leaf
growth leading to insufficient shade
excessive nitrogen blocking calcium or lack of calcium, boron

Roger Farquhar

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