ISHS Acta Horticulturae 117: II Symposium on Fireblight
NO ANTAGONISTIC EFFECT OF LEAF SURFACE MICROORGANISMS ON THE FIREBLIGHT PATHOGEN IN MODEL EXPERIMENTS |
| Author: | D. Knösel |
| Abstract:
On proving plants for the fireblight pathogen characteristic yellow colonies of Erwinia herbicola occured regularly on the nutritive substratum. The germination numbers differed depending on the host plant, habitat, season and weather between 102 to 106 bacteria/g leaf material. The share of other epiphytic bacteria and funge was generally lower. A series of these leaf surface organisms was isolated and tested in vitro for antagonistic effect on Erwinia amylovora. Non of the numerous strains of E. herbicola caused any inhibition. Bacillus subtilis and other Bacillus spp. had a more or less inhibiting influence on the fireblight pathogen in vitro. After contacting the epiphytic microorganisms with the pathogen on the host plant, Cotoneaster dammeri 'Skogholm', by spraying one after the other or together on the leaves no antagonistic effect could be proved. The plants fell sick without any delay. | |
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