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Outbreaks occur in spring as the bacteria multiply. 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. Fire blight is a common and potentially fatal disease among trees in the rose family, especially pears and apples. 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. Stem blight (branches and trunks) usually follows blossom or shoot blight when stems are expanding rapidly in summer, especially on young trees. However, it can be kept under control using organic methods to prevent the disease from spreading and killing the tree. Fire blight is an important disease effecting pear and apple. 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. Once a tree is infected, it is nearly impossible to eliminate. It is caused by the bacteria Erwinia amylovora. Fire Blight is caused by the bacterium Erwinia amylovora and is a frequently common destructive disease of some fruit trees and related plants. Apple, crabapple (Malus species), and firethorns (Pyracantha species) also are frequently damaged. It is most prevalent on the following trees: apple, pear, hawthorn, cotoneaster, firethorn and mountain ash. Is Your Tree Infected? 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. Fire blight canker The fire blight bacteria survive winter in cankers on the trunk or branches of infected trees. Infections commonly occur during bloom or on late blooms during the three weeks following petal fall. Increased acreage of highly susceptible apple varieties on highly susceptible rootstocks has increased the danger that infected blocks will suffer significant damage. Fire blight is a tree disease caused by the bacterium Erwinia amylovora. Fire Blight is a bacterial infection caused by the Erwinia amylovora bacteria. ... 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. 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. 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