![]() Complete information with images and tables of resistant and susceptible cultivars is available in this article on Fire Blight.Īnswer provided by Alan R. Rootstock resistance to fire blight (Erwinia amylovora) is tested in the field as young trees (3rd leaf) are inoculated with a mixture of virulent strains of the bacteria during bloom as in this rootstock fire blight experimental orchard (July 2005) Geneva, NY. Most apple cultivars are susceptible to fire blight, but symptoms and severity of infections can vary by cultivar. ‘Stayman’, ‘Liberty’, and ‘Golden Delicious’ cultivars are moderately resistant, and all strains of ‘Delicious’ are highly resistant to fire blight, except when tissues are damaged by frost, hail, or high winds. Copper fungicide sprays were available a few years ago but they have been withdrawn from sale. The bacterium that causes fire blight overwinters in cankers and oozes out the following spring to re-infect the plant. There are no chemical sprays available in the UK to treat fireblight. The disease can quickly spread through the canopy of susceptible varieties. Fire blight develops more rapidly when temperatures are 65 to 90☏ combined with humid or rainy weather. In apples, fire blight turns infected branches reddish brown to brown. This disease can severely damage infected trees and sometimes may kill the entire tree. Of the apple varieties planted in the eastern region, those that are most susceptible include ‘York’, ‘Rome’, ‘Jonathan’, ‘Jonagold’, ‘Idared’, ‘Tydeman’s Red’, ‘Gala’, ‘Fuji’, ‘Braeburn’, ‘Lodi’, ‘and Pink Lady’. Fire blight is a disease that can appears quickly on apple and pear trees during in the spring into early summer. The destructive potential and sporadic nature of fire blight, along with the fact that epidemics often develop in several different phases, make this disease difficult and costly to control. Certain varieties of apple are more susceptible than others. 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. ![]() Twenty-eight promising cider cultivars were. Caused by the bacterium Erwinia amylovora, the disease can attack some 75 species of plants of the rose family. ![]() This erratic occurrence is attributed to differences in the availability of overwintering inoculum, the specific requirements governing infection, variations in specific local weather conditions, and the stage of development of the cultivars available. FB can spread rapidly through apple (and pear) orchards causing extensive tree mortality and economic loss. Outbreaks are typically very erratic, causing severe losses in some orchards in some years and little or no significant damage in others. The disease is generally common throughout the United States wherever apples are grown. This is a bad year for fireblight which is a bacterial disease which affects mostly apple, pear, crabapple, hawthorn and Mt. Fire blight is a destructive bacterial disease of apples and pears that kills blossoms, shoots, limbs, and, sometimes, entire trees.
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