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Resident Populations of Pseudomonas syringae pv. syringae on Leaves, Blossoms, and Fruits of Apple and Pear Trees 1
Author(s) -
Mansvelt E. Lucienne,
Hattingh M. J.
Publication year - 1988
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1988.tb00964.x
Subject(s) - pseudomonas syringae , pear , biology , orchard , botany , pyrus communis , rosaceae , horticulture , fruit tree , bark (sound) , bacteria , ecology , genetics
Populations of pathogenic Pseudomonas syringae pv. syringae were monitored on apparently healthy leaves, blossoms, and fruit from two apple orchards with known histories of blister bark and a pear orchard with a known history of blossom blast. Populations on blossoms and fruits were higher on pears than on apples. Yellow‐pigmented, non‐pathogenic bacteria might have suppressed or masked the presence of P. syringae pv. syringae on apple trees. Populations of P. syringae pv. syringae on apple and pear leaves fluctuated sharply but higher levels generally occurred during the 1984/85 growing season than during the drier 1983/84 season. This investigation indicates that the resident phase of P. syringae pv. syringae is probably a major source of inoculum for apple blister bark and pear blossom blast in South Africa.