In spring when the bacterium becomes active, wind-blown rain or insects spread it from oozing cankers to blossoms. During periods of high humidity, infected tissue may produce a characteristic ooze. Fire blight can infect blossoms, fruit, stems, leaves, and woody branches. The characteristic symptom of fire blight is that affected plant parts (most notably the branch terminals) appear to have been scorched by fire (fig 1). Other hosts include rose, quince, hawthorn, loquat, almond, apricot, plum, cherry, chokecherry, mountain ash, raspberry, blackberry, and strawberry. In New Mexico, the disease is most common on apple, pear, crabapple, pyracantha, photinia, and cotoneaster. Within this plant family, the bacterium infects at least 39 different genera. It affects only plants in the rose family (Rosaceae).
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