Soft rotErwiniabacteria in surface and underground waters in southern Scotland and in Colorado, United States

摘要

An anaerobic liquid enrichment method followed by plating on a selective medium revealed that the soft rot coliform bacteriumErwinia carotovorasubsp.carotovorawas generally present in water from drains, ditches, streams, rivers and lakes (including reservoirs) in southern Scotland and in Colorado, United States, in mountainous, upland and arable areas through the year. Many sites were remote from susceptible or diseased crops.Erwinia carotovorasubsp.atrosepticawas isolated much less frequently and noErwiniabacteria were isolated from underground waters.Erwiniabacteria were also found in rain‐water in Scotland, in winter snow from mountain passes in Colorado, and in sea water from the west and east coasts of Scotland and from the coasts of Oregon, California, Texas, Louisiana and Florida. The significance of the occurrence of these bacteria in water is discussed in relation to the control of blackleg and soft rot diseases of potato by production ofErwinia‐free sto