Volume 51 Number 1 Article 6 Pages: 35-39
Year 1997 Month 1
Title: Effect of Periodical Cicada Injury and Degree of Fire Blight Severity on Asian Pear Cultivars
Authors: T. van der Zwet, E.W. Brown and P. Estabrook
Sixteen Asian pear cultivars grown at Virginia Gold Orchard near Natural Bridge, VA were
evaluated for shoot damage from the seventeen-year cicada (Magicicada septemdecim L.), followed by fire blight infection byj the bacterium Erwinia amylovora [(Burr.) Winsl. et al.]. The
Japanese pear cultivars, 'Yoi nashf and 'Ichiban nashi,' proved to be the most susceptible; whereas
two Korean types, 'Ar-rirang 1' and 'Korean Giant,' were most resistant.
Two Japanese cultivars,
'Shinko' and 'Singo,' proved to have intermediate resistance.
All cultivars exhibited some degree of
cicada damage and 68% showed a strong correlation between cicada injury and fire blight severity.
Those with the softest woody branches were attacked and injured most severely.
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