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![]() ![]() Twigs and branches infected with fire blight can be pruned out in order to prevent the infection from spreading to the main trunk. ![]() In highly susceptible cultivars, the bacteria can move into the main trunk of the tree and even the roots.New branch cankers are formed by bacteria moving into branches in this way. Once the bacteria have infected either blossoms or shoots, the bacteria can move into the branch through the vascular system of the tree.Young shoots are infected through small wounds caused by insect feeding, wind whipping of branches, blowing sand or other damage.
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