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spec: And that 's not a given in the United States . However , damage is often not serious enough to warrant chemical control . It produces a weakened bush on which cane dieback , stem canker , and winter injury can become severe . A planting of pear trees on " Old Home X Farmingdale " ( OH X F ) semi-dwarfing rootstocks at the Horticultural Research Center in Chanhassen has performed quite well for the last decade . This disease can appear at any time of the growing season , but is most common in cloudy , rainy weather . By Nov. 12 , insurgents were surrendering in droves , waving improvised white flags . Control weeds , such as dandelions and plantain , which may harbor the pathogen . It is not all that complicated . But I will invite my colleagues here to conclude , if they wish . '' The American people have spoken . Plus : All that glitters is not gold ! Dandelions and plantain are also susceptible and can serve as sources of the disease in home gardens .