Abstract
A bactericidal dip for mature apple (Malus sylvestris Mill.) was developed as a precaution against possible dissemination of Erwinia amylovora on fruit surfaces to fireblight-free areas. Several common bactericides including sodium hypochlorite, panacide, 8-hydroxyquinolinol sulfate, stretptomycin sulfate and acetic acid showed activity against E. amylovora in a filter paper disc bioassay. None of these compounds completely eliminated E. amylovora from the surface of apples inoculated by swabbing with bacterial ooze. Streptomycin sulfate 250 ppm and actetic acid 1.0 M were most effective as dips. Several combinations of compounds killed all bacterial cells on the surface. When apples were inoculated with a water suspension of bacterial ooze (8.2 × 106 cells/ml) a 10-min dip in 1.0 M acetic acid was completely effective.
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