Note Although the crown gall bacterium has a wide host range, plants more likely to have crown gall include all stone and pome fruit, caneberries (such as blackberry and raspberry), euonymus, Photinia, poplar, rose, walnut, and willow.
OSU Plant Clinic Collection, 2011.
OSU Plant Clinic Collection, 2011.
Flowering pear (Pyrus ussuriensis) with crown gall on the roots.
OSU Plant Clinic Image, 2013.
Old Home x Farmingdale root stock with crown gall.
This slide is labeled Hale peach from The Dalles with western X disease."
OSU Extension Plant Pathology Slide Collection, 1950.
Tattered leaves due to X-disease.
OSU Plant Clinic Image, 2018.
Peach with tattered leaves due to X-Disease.
OSU Plant Clinic Image, 2018.
Cause Most fungi that cause extensive wood decay of stone fruit trees are classified in the phylum Basidiomycota. These fungi produce various basidiocarps, such as mushrooms and conks, containing basidia. Basidiospores are forcibly discharged from basidia and usually are disseminated by air currents. Wood decay fungi enter trees primarily through wounds that expose sapwood or heartwood. Injuries from pruning, sunburn, lightning, or cultivating equipment can expose susceptible wood.
The interior of this tree trunk is almost completely rotted away.
Jay W. Pscheidt, 2007.
If you see any kind of fungal fruiting bodies such as these, there is wood decay in that branch.
