Volume 50 Number 1 Article 3
Year 1996 Month 1
Title: Performance of the NC-140 Cooperative Apple Rootstock Planting: II. A 10-Year Summary of TCA, Yield, and Yield Efficiency at 31 Sites
Author: NC-140 Committee
Abstract:
In 1984 trees of 'Starkspur Supreme Delicious'
apple (Malus × domestica Borkh) on 15 rootstocks were planted at 31 sites in North America
according to guidelines established for cooperative testing by the North Central Regional Cooperative Project (NC-140). Six midwestern
sites lost 20% or more of the trees over 10 years,
while 13 sites had less than 10% loss.
The following rootstocks had 60% or higher losses at one or
more sites: MAC.39, P22, M.4, M.26EMLA, P.2,
P.16, P.18, C6. B.9 had the best survival of the
dwarfing rootstocks in this study with no losses
at 14 sites.
Sites in KS, GA, IL, CA, VA, MO,
NC, and MI had trees with 39 to 16% larger than
average trunk cross-sectional area (TCA), while
trees in TN, PA, and MEX were 40% smaller
than the average of all sites.
Averaged across
rootstocks, sites with the greatest yield efficiency
were MA, CA, OH, and BRC and those with
lowest efficiency were KS, TN, MN, NY, AR
and NC.
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