Many dwarfing rootstocks result in trees that are more susceptible. Selecting fireblight resistant varieties of apples, pears, and crabapples is a good way to minimize the chances of fireblight infection.įor more information, see the following Colorado State University Extension fact sheet(s). Common apple varieties are regularly grafted onto dwarfing rootstock to reduce tree height. For growers in Zones 3 and 4, an apple on Antonovka standard rootstock will be much hardier, grow more vigorously, and bear fruit sooner and in greater unity. Copper sulfate can be used before leaves form in early spring. Varieties of ornamental pear trees that are less susceptible to fire blight are Bradford, Capitol, and Red Spire Aristocrat is highly susceptible. Prune twigs and branches 8 to 12 inches below visible infection.Ĭhemical control of fireblight is an option, but it’s not always effective. Dip tools in household bleach or ethyl alcohol or use household spray disinfectants. If pruning during the growing season, when the disease is active, it is extremely important to sanitize pruning tools BETWEEN EACH AND EVERY CUT. Prune fireblighted trees as soon as symptoms develop in the spring and early summer. The Venezuelan biologist, Alejandro Martínez Bilbao, has undertaken research into more than 200 types of. Certain varieties of apple are more susceptible than others. Apple scab and fire blight are two of the most important diseases affecting apple trees. In fruit trees, the disease can kill blossoms, fruit, shoots, limbs, and tree trunks. Fire blight also occurs frequently on pyracantha, spirea, hawthorn, and mountain ash. Trees that are excessively vigorous due to high nitrogen applications can be more prone to fire blight. Manage fireblight by pruning diseased parts of the tree. Caused by the bacterium Erwinia amylovora, the disease can attack some 75 species of plants of the rose family. Leaves turn yellow, then brown and finally black but remain on the branch. More commonly, trees with fireblight develop curling, bending and blackening shoots, called shepherd’s crooking.
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