Volume 53 Number 1 Article 6
Year 1999 Month 1
Title: Growth Characteristics of Selected Pecan Rootstocks Prior to Grafting
Authors: M.W. Smith, B.S. Cheary and B.L. Carroll
Abstract:
Six pecan (Carya illinoinensis (Wangenh.) K. Koch) cultivars and five pecan families (closely related individuals from a native stand, seed from at least 10 native trees were pooled) were evaluated
for use as rootstocks.
The evaluation period was from seed planting through 4-years-old, but before
the rootstocks were grafted. 'Apache' rootstocks grew more rapidly than the other rootstocks tested
during the first two years.
However, by the fourth year 'Apache' and 'Peruque' trees were similar in
height, and trunk diameters of 'Apache,' 'Giles' and 'Peruque' were not significantly different.
Coefficients of variation for tree heights and trunk diameters indicated that variability between individuals
was similar within most cultivars and families.
Budbreak date was strongly influenced by rootstock
source, with up to a 14 days difference between the first and last rootstocks to attain 90% budbreak.
An
April freeze damaged current season's growth on 90% of the 'Apache' trees, but only 10% of the
'Giles,' 'Starking Hardy Giant,' and natives from Chetopa, KS and Sapulpa, OK were injured.
Freeze
damage was dependent on the bud developmental stage.
Several significant differences in leaf elemental concentrations between rootstocks were identified.
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