Fire Blight is caused by the bacterium Erwinia amylovora and is a frequently common destructive disease of some fruit trees and related plants. Outbreaks occur in spring as the bacteria multiply. It is most prevalent on the following trees: apple, pear, hawthorn, cotoneaster, firethorn and mountain ash. Introduction to fire blight Fire blight epidemics are often sporadic, but can be devastating if optimal conditions are met. Pear (Pyrus species) and quince (Cydonia) are extremely susceptible to Fire Blight. If leaves at the end of branches are turning brown, or if branch ends are dying on your fruit trees, it's probably caused by fire blight. Named for the scorched appearance of infected leaves, fire blight is a destructive bacterial disease (Erwinia amylovora) found on apples, pears and other members of the rose family.The disease enters the tree at the tips of the branches and then travels down the stems causing dieback. Fire blight is an important disease effecting pear and apple. Is Your Tree Infected? Fire Blight is a bacterial infection caused by the Erwinia amylovora bacteria. It is caused by the bacteria Erwinia amylovora. Fire blight is one of the most devastating and difficult-to-control diseases of many fruit trees, including apple and pear, as well as of other rosaceous ornamental plants. ; In spring, during warm, wet weather, bacteria begin to multiply. Impacting pear, apple, crabapple, cotoneaster, mountain ash, hawthorn, pyracantha, spirea, and many species in the rose family, it is highly destructive and difficult to control. The bacteria overwinters on or under infected bark and in the early spring begins to ooze out. Fire blight canker The fire blight bacteria survive winter in cankers on the trunk or branches of infected trees. Once a tree is infected, it is nearly impossible to eliminate. Stem blight (branches and trunks) usually follows blossom or shoot blight when stems are expanding rapidly in summer, especially on young trees. The bacteria seep out of the canker through natural openings or cracks as a sweet, sticky liquid known as bacterial ooze. Fire blight is a common and potentially fatal disease among trees in the rose family, especially pears and apples. ... Because fireblight in the UK is sporadic, monitoring is best linked to weather, to identify risk periods when symptoms may be present, and field information. Erwinia amylovora favors rain and temperatures above 60 degrees F. If these conditions are met during apple and pear bloom and early growth stages, infection can be severe. Apple, crabapple (Malus species), and firethorns (Pyracantha species) also are frequently damaged. Increased acreage of highly susceptible apple varieties on highly susceptible rootstocks has increased the danger that infected blocks will suffer significant damage. However, it can be kept under control using organic methods to prevent the disease from spreading and killing the tree. 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