Volume 50 Number 4 Article 37
Year 1996 Month 10
Title: Cambial Browning of Cold Injured Peach Nursery Trees
Authors: D.E. Deyton, C.E. Sams, J.C. Cummins and D.W. Lockwood
Abstract:
One year old peach trees in nurseries at
McMinnville, Tenn. were exposed to -11 C on 5
Nov. 1991 prior to digging.
Nursery owners
were concerned about the relationship of tree
cambial browning to potential tree performance
after planting.
A color scale showing discolored
cambium of peach nursery trees was developed
to rate injury.
Cambial browning was rated on
trees of nine cultivars with chill hour requirements ranging from 175 to 1050. Cultivars with
less than a 500 chill hour requirement had
higher ratings. 'Harbrite' trees in size grades of
30 to 90 cm neight had less cambium browning
than trees in grades of 90 to 152 cm height.
'Redglobe' trees exposed in a programmable
freezer to -24C soon exhibited slight cambium
browning (rating = 1.6), however severe browning was evident on trees exposed to -30C or
-35C. 'Redglobe' trees exposed to ≤ -24C did
not differ in height, trunk diameter or dry
weight at the end of the growing season.
Trees
died that had been exposed to -30 or -35C. In a
similar experiment, juneprince' trees exposed
to -18C had slight cambium browning (rating =
1.2) but the trees died.
While cambial browning
may be an indicator of tree injury, the relationship between the degree of browning and injury
may be specific to cultivars or chill requirement.
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