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Norway maple; Plants--Frost resistance


Frost cracks developed on from 0 - 29 per cent of the Norway maples in one nursery near St. Paul, Minnesota, in late November, 1970. The trees affected averaged 0 .9 - 1.3 inches in diameter and, of the eight varieties in the nursery, Jade Glen was the most susceptible and Emerald Queen the most resistant. More of the trees on a northeast facing slope were affected than those on a flat knoll. After 2 years the majority of the cracks were closed, except in the Crimson King variety, in which case 86 per cent were still open. Wood rotting fungi, especially Schizophyllum commune, were recovered from 100 per cent of the trees.

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