Apple, crabapple (Malus species), and firethorns (Pyracantha species) also are frequently damaged. ; In spring, during warm, wet weather, bacteria begin to multiply. 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. 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. The bacteria overwinters on or under infected bark and in the early spring begins to ooze out. 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. Once a tree is infected, it is nearly impossible to eliminate. Fire Blight is a bacterial infection caused by the Erwinia amylovora bacteria. Fire blight is a common and potentially fatal disease among trees in the rose family, especially pears and apples. It is caused by the bacteria Erwinia amylovora. Increased acreage of highly susceptible apple varieties on highly susceptible rootstocks has increased the danger that infected blocks will suffer significant damage. Outbreaks occur in spring as the bacteria multiply. 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. Infections commonly occur during bloom or on late blooms during the three weeks following petal fall. 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 tree’s bark that look like discolored or wet patches, often with areas of dead or decayed sapwood around their edges Fire Blight is caused by the bacterium Erwinia amylovora and is a frequently common destructive disease of some fruit trees and related plants. Is Your Tree Infected? 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. Fire blight canker The fire blight bacteria survive winter in cankers on the trunk or branches of infected trees. Stem blight (branches and trunks) usually follows blossom or shoot blight when stems are expanding rapidly in summer, especially on young trees. 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