Diseases
Bacterial Diseases of Pear
Pyrus L.
The most dangerous disease of pear is fire blight, caused by Erwinia amylovora, as well as bacterial canker, for which the causative agent is Pseudomonas syringae.
In the reference 15 varieties crop Pear, where this is mentioned in the description.
Fire blight affects all above-ground organs of the pear. Characteristic symptoms include sudden blackening and wilting of flowers and fruits, which remain attached for a long time. Shoots become deformed, bending into a hook shape, and leaves turn black. Moist cankers form on the bark and trunks, from which a viscous white or amber-colored exudate is released under high humidity conditions, with the infection process often progressing from top to bottom.
The virulence of Erwinia amylovora strains is determined by their ability to induce a hypersensitive response and infect immature pear fruits. Unlike apple, there are practically no generally accepted markers for specific resistance genes in pear breeding; therefore, breeding work is focused on finding resistance donors among Pyrus species and assessing the field resistance of cultivars during trials.
General information about the subject — on the page Bacterial diseases.
Varieties of Pear mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
No varieties yet.