Canker surfaces develop raised pinhead-size pimples (pycnidia) in the bark of most smooth-bark cultivars, but these may not be readily visible in cankers on peach and cherry stems. Cytosporacanker is one of the most destructive diseases of peaches, nectarines, apricots, sweet cherries, and plums in Pennsylvania. Cytosporacanker is a devastating necrotic fungal disease in peaches. The pathogen infects the bark at wounds and spreads, eventually girdling whatever branch or trunk it infects. Also known as cytosporapeachcanker, this tree disease may affect many other stone-type fruits. In addition to peaches, trees that may all develop signs of this fungal disease include DOI: 10.17660/ActaHortic.1989.254.13. Abstract: All peach, Prunus persica L. Batsch, genotypes evaluated were susceptible to the peachcanker pathogens, Leucostoma cincta (Pers.: Fr.) Cytosporacanker of peach trees in Colorado: Survey of incidence, canker location and apparent infection courts. Cytospora-infected peach twigs Photo by: R.S. Byther.The fungi which cause Cytosporacanker attack through wounds on twigs and branches. Initial cankers are small, but enlarge... Cytospora sorbicola and C. plurivora are significant canker pathogens that affect stone fruits and several other woody plants, severely limiting orchard productivity and longevity. AKA "peachcanker," "Cytosporacanker," "Leucostoma canker," and "Valsa canker", it is a destructive fungal infection that primarily affects peach trees, but it can also damage... In a survey of peachcanker in widely separated areas of southern Ontario, Valsa leucostoma Fr. was recovered more frequently and consistently than V. cincta and other suspect pathogens. Cytosporacanker, sometimes called gummosis for the brown ooze produced at the infection site, slows growth and girdles branches. PeachCytosporacanker is a serious pathogen of all stone fruit (peach, apricot, plum, nectarine, almond and cherry). Trees as well as shrub-forms are susceptible to this pathogen. Perennial canker damage is limited to cambium tissue, but other wood decay fungi often enter through canker sites. Early development of perennial canker (sunken lesion) with gummosis.
