![]() Fire blight gets its name from the burnt appearance of affected blossoms and twigs. In addition, because the bacterium can infect over 75 species of trees and. 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 is one of the most destructive orchard diseases of apples and pears. However, should an apple tree happen to grace your yard, this chore may be of extra importance to the health of your tree.įire blight is the enemy of rosebushes and apple and pear trees. It can kill or disfigure a tree or shrub, depending on the susceptibility of the host and weather conditions. No one will dispute the tedium of raking and disposing of the autumn leaves that litter our lawns. 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. These rust fungi spend a portion of their life cycle on rosaceous hosts such as apple, flowering crab, and hawthorn, and another portion on species of Juniperus (which includes eastern red cedar).Īpple scab ( Venturia inaequalis) is a common fungal disease affecting apple and crabapple 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. The highly invasive callery pear, which is often seen along the margins of fields, is very susceptible to fire blight and can be a source of the disease (see HGIC 1006, Bradford Pear ). Therefore, irrigate to prevent drought stress. ![]() 'Prairifire' reportedly has high disease resistance. Some of these include crabapple, pyracantha, cotoneaster, hawthorn, photinia, quince, serviceberry, loquat, and spirea. Trees most susceptible are those under drought stress. ![]() Potential insect pests are of lesser concern and include tent caterpillars, aphids, Japanese beetles, borers and scale. Infested fruits also are prone to spoilage.Ĭedar-apple, cedar-hawthorn, and cedar-quince rust are common diseases of apple and flowering crab. The main diseases of crabapple are scab, fire blight, rusts, leaf spot and powdery mildew. The apple maggot ( Rhagoletis pomonella) is a potentially serious pest of apple as the maggots (larvae) tunnel the fruit, creating characteristic dark tracks.
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