Volume 45 Number 4 Article 5
Year 1991 Month 10
Title: Abnormalities in 'Starkspur Supreme Delicious' on Nine Rootstocks in the 1980-81 NC-140 Cooperative Planting
Author: NC-140
Abstract:
'Starkspur Supreme Delicious' on MAC.24,
OAR 1, M.7 EMLA, M.26 EMLA, O.3, M.9
EMLA, M.9, Mark, and M.27 EMLA were
planted at 27 sites in the United States and
Canada in 1980-81. During the 10 years of the
trial, biotic and abiotic abnormalities occurred.
Some were confined to one location while
others were more widespread.
An outbreak of
fire blight (Erwinia amyfovora Burr) developed
in the Virginia trial.
Although there was no
significant effect of rootstock on the severity of
infection initiated in the scion, tree losses varied
with rootstock.
Tree losses ranged from 61% and
50% on M.26 EMLA and O.3, respectively, to 0
to 20$ for the other rootstocks.
In Arkansas,
Internal Bark Necrosis occurred; trees on M.27
EMLA and Mark were most severely affected,
followed by M.26 EMLA and O.3. The least
affected trees were on OAR 1. A growth pro
liferation occurred on essentially all Mark root
stocks in 7 locations.
A swelling was located on
the rootstock shank, at the ground line and
below, with no apparent relationship to the bud union.
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