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Sensitivity of isolates of Macrophoma theicola from untreated and DMI treated tea to hexaconazole

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Abstract

Stem canker disease caused by Macrophoma theicola is a serious disease of tea in low country tea gardens in Sri Lanka. There is no evidence for the widespread use of demethylation-inhibition (DMI) fungicide, hexaconazole in the stem canker prevalent areas except for a few locations. The objective of this study was to assess both untreated and DMI treated populations of M. theicola for sensitivity to hexacon-azole. A total of 106 isolates of M. theicola were collected during the period 2009–2010 from both untreated and treated populations. The EC50 values of hexaconazole for isolates of M. theicola ranged from 0.001–0.008 μg ml−1 and 0.002–0.02 μg ml−1 for untreated and treated populations respectively. The mean EC50 values of hexaconazole of the DMI treated isolates were significantly higher than that of the untreated isolates. Results revealed that there is a clear trend towards reduced sensitivity to hexaconazole in the treated isolates.

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Authors and Affiliations

  1. Tea Research Institute of Sri Lanka, St Coombs, Talawakelle, Sri Lanka

    Pradeepa N. H. Liyanage, Chaminda J. Liyanaarachchi, Nadeeka D. G. P. Karunajeewa, Janaka K. G. P. Mahindapala & Sarath I. B. Abeysinghe

  2. Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, Sri Lanka

    Pradeepa N. H. Liyanage & Jagath O. V. D. S. Weerasena

  3. Department of Plant Sciences, University of Colombo, Sri Lanka

    Ravi L. C. Wijesundera

Authors
  1. Pradeepa N. H. Liyanage
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  2. Jagath O. V. D. S. Weerasena
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  3. Chaminda J. Liyanaarachchi
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  4. Nadeeka D. G. P. Karunajeewa
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  5. Janaka K. G. P. Mahindapala
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  6. Ravi L. C. Wijesundera
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  7. Sarath I. B. Abeysinghe
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Correspondence to Pradeepa N. H. Liyanage.

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Liyanage, P.N.H., Weerasena, J.O.V.D.S., Liyanaarachchi, C.J. et al. Sensitivity of isolates of Macrophoma theicola from untreated and DMI treated tea to hexaconazole. J Plant Dis Prot 120, 201–204 (2013). https://doi.org/10.1007/BF03356475

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  • DOI: https://doi.org/10.1007/BF03356475

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