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Outbreaks occur in spring as the bacteria multiply. 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 destructive disease caused by a bacterium (Erwinia amylovora) that thrives in the warm, humid, and rainy weather that coincides with the start of the growing season, and it is easily spread.You can identify fire blight by several characteristics: Cankers on a trees bark that look like discolored or wet patches, often with areas of dead or decayed sapwood around their edges Pear (Pyrus species) and quince (Cydonia) are extremely susceptible to 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 a tree disease caused by the bacterium Erwinia amylovora. Apple, crabapple (Malus species), and firethorns (Pyracantha species) also are frequently damaged. Fire Blight is a bacterial infection caused by the Erwinia amylovora bacteria. 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. 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. 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. However, it can be kept under control using organic methods to prevent the disease from spreading and killing the tree. Increased acreage of highly susceptible apple varieties on highly susceptible rootstocks has increased the danger that infected blocks will suffer significant damage. Once a tree is infected, it is nearly impossible to eliminate. ; In spring, during warm, wet weather, bacteria begin to multiply. It is most prevalent on the following trees: apple, pear, hawthorn, cotoneaster, firethorn and mountain ash. Is Your Tree Infected? The bacteria overwinters on or under infected bark and in the early spring begins to ooze out. Fire blight is a common and potentially fatal disease among trees in the rose family, especially pears and apples. Introduction to fire blight Fire blight epidemics are often sporadic, but can be devastating if optimal conditions are met. 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. 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