Volume 48 Number 4 Article 16
Year 1994 Month 10
Title: Survival and Growth of 'Empire' Apple Trees Chip Budded onto Mark or M.9 Rootstock
Authors: M.R. Warmund and B.H. Barritt
Abstract:
'Empire' apple (Aldus domestica Borkh.) was
budded onto Mark or M.9 rootstock on 16 July,
9 Aug., 30 Aug., or 23 Sept. 1990 in Illinois and
Washington to determine the effect of time of
chip budding on tree survival, scion growth,
and union overgrowth.
Most of the trees (≥
68%) propagated in July or August produced
scion growth by 5 May 1991. However, scion
wilting occurred subsequently, resulting in sub
stantial tree loss.
By October 1991, scions that
were budded on Mark rootstock on 30 Aug.
1990 generally had the greatest survival at both
locations.
In contrast, 'Empire'/M.9 trees chip
budded in Illinois on 23 Sept. tended to have
the greatest scion survival and growth and
number of branches.
In Washington, M.9 rootstocks
budded on 16 July had greater scion
survival than those budded on 30 Aug. or 23
Sept.
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