Volume 50 Number 1 Article 10
Year 1996 Month 1
Title: Blackheart Injury in ´Starkspur Supreme Delicious` on 15 Rootstocks in the 1984 NC-140 Cooperative Planting
Authors: M.R. Warmund, W.R. Autio, J.A. Barden, J.N. Cummins, P.A. Domoto, C.G. Embree, R.L. Granger, F.D. Morrison, J.R. Schupp and E. Young
Abstract:
Blackheart injury was evaluated at 25 cm
above the soil surface on trees in the NC-140
'Starkspur Supreme Delicious' plantings located
in Iowa (IA), Kansas (KS), Massachusetts (MA),
Maine (ME), Missouri (MO), North Carolina
(NCJ, Nova Scotia (NOS), New York (NY),
Quebec (QUE), and Virginia (VA) after 10
years growth.
Trees grown in IA, KS, MO and
QUE exhibited the greatest amount of blackheart,
whereas those grown in MA, NC, NOS,
NY, and VA had the least amount of damaged
xylem tissue.
Overall, trees on B.9. P.2, P.16, and
P.22 were more susceptible to blackheart injury
than those on B.490, MAC.l, C.6, and MAC.39.
Tracing the area of the discolored xylem and the
total xylem area and then calculating the percent
blackheart injury on a weight basis resulted in a
better separation of injury among rootstocks
than estimating blackheart by other methods.
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