DIAGNOSIS OF THE CANKER DISEASE OF APRICOT TREES CAUSED BY EUTYPA ARMENIACAE HANSF. AND CARTER
An examination of the lower part of the wilted or dead branch will reveal a canker adjacent to some previous injury (usually a pruning wound which has exposed the xylem. The bark will usually be depressed and darkened, there may be some longitudinal cracks and often (but not always) there may be some exudation of gum from the internal tissues. By contrast, a canker caused by bacteria (Pseudomonas spp.) is usually confined to the bark tissues only.