Histopathology of canker development on peach trees after inoculation with Cytospora leucostoma

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Abstract
Anatomical changes in response to wounding or wounding plus inoculation with C. leucostoma were monitored over an 11-month period. Distinct bands of gum ducts in the xylem formed a barrier zone in all samples. Necrophylactic periderm (NP) formed at a faster rate in noninoculated samples. NP in inoculated samples was poorly delimited and weakly suberized in the callus tissue. Within 4 weeks after wounding, barriers in bark and xylem of inoculated samples were penetrated by wedges of mycelia. Callus in inoculated samples differentiated slowly compared with callus development in control wounds and multiple attempts to limit infection were ineffective. The effectiveness and value of a strong gumming response in reaction to Cytospora are discussed.