Abstract
Six biological control agents, four commercial products with Trichoderma harzianum, one with Streptomyces sp., and one with Bacillus subtilis were tested for their ability to reduce root infection with Spongospora subterranea f. sp. subterranea, the causal agent of powdery scab and the vector of the spraing-provoking Potato mop-top virus. Inoculum of resting spore balls of S. subterranea was mixed with each control agent in glasshouse pot experiments using tomato as host plant. The two T. harzianum-contarning products: TRI 002 and Binab TF significantly reduced the root infection level by zoosporangia of S. subterranea. However, this was not unambiguously reflected in an increased growth of shoot and roots of the host plant. In all experiments, the root inoculation with S. subterranea alone resulted in significant reductions of shoot and root mass. The results indicate a potential use of selected strains of T. harzianum as seed dressing to control spread of S. subterranea and Potato mop-top virus from seed potatoes.
Zusammenfassung
Sechs biologische Bekämpfungsmittel, hierunter vier Handelsprodukte mit Trichoderma harzianum, eines mit Streptomyces sp. und eines mit Bacillus subtilis, wurden bezüglich ihres Vermögens zur direkten Bekämpfung von Wurzelinfektionen mit Spongospora subterranea f. sp. subterranea, Erreger des Pulverschorfes der Kartoffel und Vektor des Eisenfleckigkeit provozierenden Potato mop-top virus, in Topfversuchen im Gewächshaus getestet. Inokulum in Form von Dauersporen von S. subterranea wurde zusammen mit den Mitteln in den Boden eingemischt. Tomaten dienten als Fangpflanzen. Zwei Mittel mit T. harzianum, TRI 002 und Binab TF, reduzierten in signifikanter Weise die Kolonisierung der Tomatenwurzeln mit primären Zoosporangien. Diese Reduktion spiegelte sich aber nicht in einem stärkeren Wachstum der Wurzeln und des Krautes der Fangpflanzen wider. In allen Versuchen resultierte eine Infektion nur mit S. subterranea (positive Kontrolle) in einer signifikanten Reduktion der Wurzel- und Krautmasse. Die Ergebnisse deuten auf, dass die Ausbreitung von S. subterranea und Potato mop-top virus mit Pflanzkartoffeln vermindert werden kann.
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Nielsen, S.L., Larsen, J. Two Trichoderma harzianum-based bio-control agents reduce tomato root infection with Spongospora subterranea (Wallr.) Lagerh., f. sp. subterranea, the vector of Potato mop-top virus. J Plant Dis Prot 111, 145–150 (2004). https://doi.org/10.1007/BF03356140
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DOI: https://doi.org/10.1007/BF03356140
Key words
- Spongospora subterranea
- powdery scab
- biological control
- Trichoderma harzianum
- Streptomyces
- Bacillus subtilis
- Potato mop-top virus