Control of Erwinia amylovora
Sugar et al. (US) reported that fosetyl-Al gave some control of fireblight but that further tests have to be carried out to define the optimum application time and to confirm the results.
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In Greece (Tsiantos & Psallidas) experiments with various chemical compounds were carried out. It was reported that streptomycin, flumequin and oxonilic acid gave the best control of fireblight.
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Inoculation with avirulent strains of E. amylovora before inoculation with virulent strains resulted in the decrease of the virulent strain population in apple and provided a high level of protection, as reported by Tharaud et al. (FR).
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Interactions between Pseudomonas fluorescens strain A506 and E. amylovora in pear blossoms were reported by Wilson & Lindow (US). They reported that if the biological control agent is applied 72 h in advance of the pathogen it has the capability to exclude the pathogen from the stigma through a preemptive utilization of resources either nutritional or physical. Additionally, Lindow (US) presented results which showed that application of this biological control agent can reduce fireblight incidence on shoots 60-80%.
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It was reported by Kearns & Hale (NZ) that E. herbicola (isolate Eh 1087) applied at early and mid-blossom stages gave 70 to 80% protection from fireblight in apples.
Sources
6th International Workshop on Fireblight, Athens (GR) (1992-10-20/23)