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Necrotic grapevine material from the current season is a source of Botrytis cinerea inoculum

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Abstract

Botrytis cinerea is a pathogen of grapes and other fruit crops which has a complex disease cycle that allows it to survive and infect host tissues through multiple pathways. This study in three vineyards and across three growing seasons investigated the different types of necrotic trash within grape bunches and their potential to act as inoculum sources to cause bunch rot. The amounts and types of bunch trash differed across a growing season, with calyptrae and stamens reducing after pre-bunch closure, while aborted and damaged berries increased towards véraison and harvest. Overall, damaged berries, leaf fragments and tendrils presented the greatest potential as inoculum sources because they had greatest levels of natural infection after véraison and the greatest sporulation potential. The numbers of conidia produced per mm2 of tissue were 2,996, 986 and 2,011 for damaged berries, leaf fragments, and tendrils. However, only aborted berries were consistently associated with development of eventual bunch rot in the three vineyards. The sources of inoculum identified in this study could initiate secondary cycles of infection and sporulation, with consequential bunch rot under moist conditions.

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Acknowledgments

We wish to thank the Foundation for Technology and Research (NZ) for funding this PhD (AMS) study and the many grape growers who allowed the experiments to be conducted within their vineyards.

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Authors and Affiliations

  1. Agriculture and Life Sciences Faculty, Lincoln University, PO Box 84, Lincoln, New Zealand

    Marlene V. Jaspers & Alison M. Seyb

  2. New Zealand Institute for Plant & Food Research Ltd, PO Box 845, Blenheim, New Zealand

    Michael C. T. Trought

  3. Delegat Limited, PO Box 305, Blenheim, New Zealand

    Rengasamy Balasubramaniam

Authors
  1. Marlene V. Jaspers
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  2. Alison M. Seyb
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  3. Michael C. T. Trought
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  4. Rengasamy Balasubramaniam
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Correspondence to Marlene V. Jaspers.

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Jaspers, M.V., Seyb, A.M., Trought, M.C.T. et al. Necrotic grapevine material from the current season is a source of Botrytis cinerea inoculum. Eur J Plant Pathol 144, 811–820 (2016). https://doi.org/10.1007/s10658-015-0726-4

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  • DOI: https://doi.org/10.1007/s10658-015-0726-4

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