Volume 45 Number 4 Article 3
Year 1991 Month 10
Title: Performance off 'Starkspur Supreme Delicious' on 9 Rootstocks at 27 Sites Over 10 Years
Author: NC-140
Abstract:
In 1980-1981, 'Starkspur Supreme Delicious'
trees on 9 rootstocks were planted at 27 sites in
the United States and Canada according to
guidelines established for cooperative testing
by the NC-140 technical committee.
Over the
years, 7 plantings were removed because of
excessive tree loss due to voles (NY), winter
injury (MN, MT), or other factors (CO, MO,
NC, SC). The following sites averaged less than
10$ tree loss over the 10 years of the study: MA,
OR, ONT, WA, WI and PA. Trees on M.7 EMLA
survived well at all sites.
IA lost all trees on
MAC.24 to winter injury, while 8 sites had no
losses with this rootstock.
Based on trunk crosssectional
area (TCA), trees at the following sites
were the largest: GA, IL, IN, ONT, CA and VA
and smallest in WA, MA and QUE. Height of
trees on M.26 EMLA and O.3 varied more than
other rootstocks of comparable size (M.9 EMLA,
M.9 and MAC.9). CA averaged much higher
yield efficiencies than the other sites, because
of high yield efficiencies on MAC.24, M.7 EMLA
and OAR 1. Tree size in MA was small, but
yields were high.
Generally, trees in CA and MA
had high production efficiencies as measured
by yield/TCA. Production efficiencies were
lowest in AR, IA and QUE. In addition to CA
and MA, O.3 was very efficient in OR, ONT
and WI.
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