Fire blight is a disease that is very environmentally dependent, and warm, wet weather at flowering is most conducive to serious disease development
Fire blight is a bacterial disease, caused by the bacterial pathogen Erwinia amylovora, which exhibits symptoms on leaves, canes, flowers and fruit of raspberries and blackberries. Although this is the same organism that causes fire blight on pear and apple, it is a different strain. Thus the strain that attacks raspberries and blackberries will not infect apple or pear and vice versa.
The bacteria are likely spread from plant to plant by insects, wind, and splashing water. Rain, high humidity, and warm temperatures favor disease development. It is not known how and where the bacteria... read more