1887

Abstract

Seven avirulent strains of were mixed in various combinations and tested for virulence. Only one combination, where the capsulated avirulent strain P66 was combined with the non-capsulated avirulent strain 4S2, induced fireblight symptoms in immature pear fruits and apple shoots. Growth studies strongly suggested that these strains were acting synergistically and that the non-capsulated strain possessed another, as yet unknown, virulence factor.

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/content/journal/micro/10.1099/00221287-116-2-351
1980-02-01
2021-07-23
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