Fire blight (2014)
Abstract
Fire blight is a bacterial disease affecting apple, crabapple, pear, hawthorn, pyracantha (firethorn) and related species. The bacteria commonly overwinter in cankers (sunken diseased areas) on the tree, which produce a sticky exudate in early spring. The bacteria are usually spread from the cankers by insects and by wind-blown rain. Careless pruning practices may also spread the bacteria
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