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Antagonismus in vivo von fluoreszierenden Pseudomonaden gegenüber Rhizoctonia solani und Pythium aphanidermatum an Gurken und Buschbohnen

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Abstract

Fluorescent pseudomonads, which showed antagonism in vitro against Rhizoctonia solani and Pythium aphanidermatum, were investigated for antagonism in vivo using bean and cucumber. The efficiency of the antagonists in germination tests against Rhizoctonia solani was lower than against Pythium aphanidermatum. In soil infected with Rhizoctonia solani the germination rates of the seeds remained between 30 and 40%, whereas against Phytium aphanidermatum some Pseudomonas-strains caused germination rates of 40–60%. The preventive effect of the antagonists against fungal infection after the germination was better. 16 isolates reduced the damage caused by Rhizoctonia solani to bean between 90 and 100%. Damage caused by Pythium aphanidermatum to cucumber was reduced by 12 antagonists between 70 and 80%.

Zusammenfassung

Fluoreszierende Pseudomonaden, die sich als Antagonistenin vitro gegenüberRhizoctonia solani undPythium aphanidermatum erwiesen haben, wurden an Gurken und Bohnen auf Antagonismusin vivo untersucht. Die Effizienz der Antagonisten in Auflaufversuchen gegenüberR. solani war niedriger als beiP. aphanidermatum. Die besten Isolate konnten in mitR. solani verseuchter Erde Auflaufraten von 30–40% erzielen, gegenüberP. aphanidermatum dagegen 40–60%. Die Wirkung der Antagonisten zur Verhütung von Spätinfektionen der Pflanzen war deutlich besser. So konnten 16 Isolate eine Schädigung durchR. solani an Bohnen zwischen 90 und 100% reduzieren. An Gurken konnten 12 Isolate eine Schädigung durchP. aphanidermatum auf 70–80% reduzieren.

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Author notes

  1. S. Sarkar

    Present address: Institut für Phytomedizin, Fachgebiet Virologie und Bakteriologie, Universität Hohenheim, P.O. Box 700562, D-40212, Stuttgart-Hohenheim, Deutschland

  2. M. Wölk

    Present address: Flora Nova GmbH, Königsallee 13, D-70593, D-40212, Düsseldorf, P.O. Box 700562

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  1. Institut für Phytomedizin, Fachgebiet Virologie und Bakteriologie, Universität Hohenheim, P.O. Box 700562, D-40212, Stuttgart-Hohenheim, Deutschland

    M. Wölk

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Wölk, M., Sarkar, S. Antagonismus in vivo von fluoreszierenden Pseudomonaden gegenüber Rhizoctonia solani und Pythium aphanidermatum an Gurken und Buschbohnen. Anz. Schadlingskde., Pflanzenschutz, Umweltschutz 68, 3–8 (1995). https://doi.org/10.1007/BF01980347

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