Volume 60 Number 3 Article 20
Year 2006 Month 7
Title: Relative Susceptibility of Ornamental Peach Cultivars to Fungal Gummosis (Botryosphaeria dothidea)
Authors: T.G. Beckman and C.C. Reilly
Abstract:
Peach fungal gummosis, incited by Botryosphaeria dothidea (Moug.:Fr.) Ces. & De Not., is an unsightly disease
of peach trees [Prunus persica (L.) Batsch] that depresses growth and can cause significant dieback and even tree
death on susceptible peach cultivars.
Little is known about the relative susceptibility of ornamental peach cultivars
utilized in the United States landscape industry.
Peach prunings inoculated with B. dothidea and placed on trellis
wires served as an inoculum source which was delivered to the test subjects planted below via intermittent misting
during March through June of the first year.
Disease severity was evaluated at the end of the second growing
season after visible symptoms developed.
The 13 ornamental genotypes tested separated into four distinct classes
with ‘White Glory’, ‘Jerseypink’ and PI091459 (‘Red Weeping’) in the most susceptible, and ‘Helen Borchers’ and
‘McDonald’ in the most resistant classes.
Trunk cross-sectional area at the end of the second growing season and
relative growth rate during the second growing season were negatively correlated with gummosis severity.
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