Abstract
Colonization of 'Packham's Triumph' pear blossoms by Pseudomonas syringae pv. syringae van Hall was examined by scanning electron microscopy. All flower parts examined were colonized. One day after inoculation, numerous bacteria occurred between papillae and in the underlying tissue of stigmas, and on the surface of nectariferous tissue. Small colonies with distinct cells were seen on filaments. Masses of bacteria were present in receptacle tissue 2 days after inoculation. The pressure exerted by the expanding mass of bacteria within some regions of this tissue separated the cuticle from the epidermis. The pathogen probably entered internal tissue through natural openings present in the nectariferous region of the blossoms.
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