Biological Control of Fireblight (Erwinia amylovora [Burr.] Winslowet al.) on Ornamentals: I. Control of the Pathogen by Antagonistic Bacteria
1985
Isenbeck, M. | Schulz, F.A.
The development of a biological control procedure against fireblight on ornamentals was started. A considerable number of bacterial strains was isolated from the following blighted host species: Pyrus communis, Cydonia oblonga, Cotoneaster bullatus, C. salicifolius floccosus, Crataegus monogyna and Rosa canina. In a preliminary screening test 17 of these isolates showed antagonistic activity against the bacterial pathogen Erwinia amylovora (Burr.) Winslow et al. The strains C/1, C/81 and E.h. 112 y were effective in disease reduction in the pear fruit system. By using C. bullatus highly significant protection could be obtained under controlled conditions if the antagonist was applied by injection 24 h ahead of the pathogen. In this case the application was as effective as the treatment with 200 ppm streptomycin. Under field conditions following natural infections disease reduction was about 20%.
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