Fire blight is the enemy of rosebushes and apple and pear trees.
Introduction. Fire blight is the enemy of rosebushes and apple and pear trees. It is caused by a bacteria (Erwinia amylovora) which attacks starting generally from the blossoms or flowers and moving up to the twigs and then the branches. Fire blight gets its name from the burnt appearance of affected blossoms and twigs. What is fire blight? Fire blight is the most destructive bacterial disease affecting plants in the rose family, including apple, pear, crabapple, hawthorn, cotoneaster, mountain ash, quince, rose, pyracantha, and spirea. Fire blight is a bacterial disease of apple trees that can kill blossoms, new green shoots, branches, and sometimes entire trees. In Minnesota, fire blight is rarely a problem on blossoms due to cool temperatures during bloom. Fire blight, also written fireblight, is a contagious disease affecting apples, pears, and some other members of the family Rosaceae. It is a serious concern to apple and pear producers. Under optimal conditions, it can destroy an entire orchard in a single growing season. Fire blight is a disease caused by the bacterium Erwinia amylovora. This bacterium can attack more than 75 species of trees and shrubs including apple, pear, quince, mountain ash, crabapple, hawthorn, cotoneaster, serviceberry, and pyracantha.
http://fireblight.com/ http://hort.uwex.edu/articles/fire-blight/ http://www.extension.umn.edu/garden/yard-garden/fruit/apple-pest-management/fire-blight/ https://en.wikipedia.org/wiki/Fire_blight http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/fire-blight
what is fire blight