physalospora piricola Nose is
caused by Botryosphaeria
berengeriana f. sp. piricola,
this pathogenic bacteria mainly infects
branches and fruits of pears, and also
infects leaves. Botryosphaeria beren-
geriana f. sp. piricola has wide host
range, except to pears, it mainly haz-
ards to apples, peaches, apricots,
Malus asiatica, hawthorn, jujube and