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Biology and Fertility of Soils

, Volume 3, Issue 4, pp 195–198 | Cite as

Relationship of root necrosis potential of soil to asparagus (Asparagus officinalis) decline in Switzerland

  • G. Gordon-Lennox
  • D. Gindrat
Article

Summary

The possible relationship between asparagus decline and the root necrosis potential (RNP) of soil was investigated for 11 asparagus and 4 nonasparagus soils. Asparagus seedlings were grown in each soil in climate chambers. A root necrosis index was used to determine RNP. RNP was correlated with the decline observed in the field for seven white asparagus crops, but not for three white and one green asparagus crops. Low RNP values were obtained from the soils not planted to asparagus.Fusarium oxysporum andF. oxysporum var. redolens accounted for 7070 of the fungi isolated from necrotic roots in RNP tests. BothFusarium were obtained from all soils. AllF. oxysporum andF. oxysporum var. redolens isolates tested were highly virulent on asparagus seedlings in inoculation experiments.F. solani, Penicillium verrucosum var.corymbiferum, andRhizoctonia violacea were isolated less frequently but were also highly virulent. It is concluded that soil RNP indicated a risk of decline caused by fusaria, but other soil factors were likely to be involved in the aetiology of decline. The study of these factors is necessary to develop a method for the prognosis of decline associated with fusaria.

Key words

Asparagus officinalis Asparagus root necrosis Root necrosis potential (RNP) Fusarium oxysporum Fusarium oxysporum var.redolens Fusarium solani Penicillium verrucosum 

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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • G. Gordon-Lennox
    • 1
  • D. Gindrat
    • 1
  1. 1.Federal Agricultural Research Station of ChanginsNyonSwitzerland

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