Fireblight in Crabapples and Flowering Pear

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Gail Ruhl, Senior Plant Disease Diagnostician, Department of Botany & Plant Pathology, Purdue University

Symptoms of fireblight have recently become more evident following several weeks of elevated temperatures. Fireblight is caused by the bacterium Erwinia amylovora. It affects over 130 plant species in the rose family including apple, crabapple, pear (including ornamental pear), mountain ash, hawthorn and cotoneaster. It also occurs on Rubus species such as red and black raspberry and thornless blackberry.

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