Volume 41 Number 1 Article 6 Pages: 19-22
Year 1987 Month 1
Title: Fire Blight Susceptibility of Apple Introductions and Selections
Authors: S.A. Mehlenbacher and E.H. Varney
Citation
Abstract:
Susceptibility of 68 cultivars and selections of
apple (Malus x domestica) to Erwinia amylovora was determined by artificial inoculation of
trees in the orchard.
Ten vigorously growing
shoots per tree were tip inoculated by injecting
a 36-hr broth culture of a highly pathogenic
local isolate.
Lesion length was measured 3 mo
after inoculation and expressed as a percentage
of the current season's shoot length.
Mean per
centage ranged from 2 to 171%, indicating a
wide range in levels of genetic susceptibility to
fire blight.
Old cultivars of European origin
were generally highly susceptible cultivars of
North American origin and genotypes selected
for resistance to apple scab (Venturia inaequalis)
were generally resistant.
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