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.
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.
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).
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%.
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.
6th International Workshop on Fireblight, Athens (GR) (1992-10-20/23)