Diseases
Pyrus communis L.
The most dangerous bacterial disease of pear, caused by the Gram-negative bacterium Erwinia amylovora, which affects all aerial plant organs. It is characterized by sudden blackening of flowers, wilting of shoots in a 'shepherd's crook' shape, and the release of bacterial exudate from bark cankers.
In the reference 285 varieties crop European pear, where this is mentioned in the description.
The causative agent of the disease is the bacterium Erwinia amylovora (Burrill) Winslow et al. The pathogen infects flowers and ovaries, which turn black and wither, as well as young shoots, the tips of which bend in the shape of a hook, followed by the blackening and drying of leaves. Wedge-shaped cankers form on the affected branches and trunk, from which a viscous milky-white or amber-colored bacterial exudate is released during periods of high humidity.
When infected, fruits turn black and mummify, remaining hanging on the tree. In pear breeding, resistance to the pathogen is described by expert ratings such as high, tolerant, or resistant, as a generally accepted letter nomenclature for specific resistance genes is not applied in agronomic practice.
General information about the subject — on the page Bacterial diseases.
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.
Pyrus communis L. · European pear
Mykychuk Oksana Ivanivna, Kozhokar Zina Myroslavivna, Dronyk Nataliia Illivna,
Pyrus communis L. · European pear
Khodakivs`ka IUliia Borysivna, Matviienko Mykola Vasylovych,