Volume 45 Number 4 Article 6
Year 1991 Month 10
Title: Blackheart Injury in 'Starkspur Supreme Delicious' on Nine Rootstocks in the 1980-1981 NC-140 Cooperative Planting
Authors: M.R. Warmund, D.C. Ferree, P. Domoto, J.A. Barden, C.A. Mullines and R.L. Granger
Abstract:
Blackheart was measured at 25 cm above the
soil surface in trees in the NC-140 'Starkspur
Supreme Delicious' plantings located in Iowa,
Ohio, Quebec, Tennessee, and Virginia after at
least ten years of growth.
Trees at all five
locations exhibited blackheart injury.
However,
trees grown in Iowa, under the coldest climatic
conditions, had the greatest amount of blackheart.
Trees grown in Ohio and Quebec were
intermediate in blackheart injury, while those
grown in Tennessee and Virginia, under mild
winter conditions, had less injury.
Overall, M.7
EMLA and OAR.l trees had greater blackheart
injury than M.9 and Ottawa 3 (O.3) trees.
All
MAC.24 trees were killed in Iowa in 1986 due to
a November freeze and all M.27 EMLA trees in
Ohio were dead by the spring of 1989 due to
severe frost heaving conditions.
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