A bioassay to compare the disease suppressive capacity of pasture soils


  • B.E.A. Dignam
  • M. O'Callaghan
  • L.M. Condron
  • J.M. Raaijmakers
  • G.A. Kowalchuk
  • S.A. Wakelin




Dynamic pathogen complexes can develop under pastures thereby substantially reducing potential productivity Suppression of such pathogen complexes is therefore of great importance and bioassays can quantify disease suppression in soils This study describes the development of a pasturerelevant system Rhizoctonia solani AG 21 induced dampingoff (wirestem) of kale (Brassica oleracea) As kale is not a component of traditional ryegrass clover pasture swards the assay allows assessment of general disease suppression considered more enduring in multiplehostmultiplepathogen systems A pathogenic Rhizoctonia solani isolate was obtained from New Zealand pastoral soil Inoculation of soils with this isolate resulted in a level of dampingoff disease comparable to that induced by reference Rhizoctonia solani isolate Rs0432 Significantly different levels of inoculuminduced disease incidence and progression were found in four distinct pastoral soils In combination with soil physicochemical data and environmental DNA approaches this bioassay can be used to further advance understanding of the influence of farm management practices on disease suppression in pasture soils




How to Cite

Dignam, B., O’Callaghan, M., Condron, L., Raaijmakers, J., Kowalchuk, G. and Wakelin, S. 2015. A bioassay to compare the disease suppressive capacity of pasture soils. New Zealand Plant Protection. 68, (Jan. 2015), 151–159. DOI:https://doi.org/10.30843/nzpp.2015.68.5834.




Most read articles by the same author(s)

1 2 > >>