Effect of initial population densities of Ditylenchus destructor and D. dipsaci on potato tuber damage and nematode reproduction

in Nematology
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Glasshouse experiments were conducted to evaluate the effect of initial population densities (Pi) of Ditylenchus destructor and D. dipsaci on potato tuber damage and nematode reproduction. Ditylenchus destructor did not influence tuber numbers but influenced tuber weight at high Pi levels. Ditylenchus dipsaci influenced tuber numbers and weights at a Pi level of 14.29 (g growing medium)−1. Tolerance limit estimates according to the Seinhorst model were very low indicating both nematode species have a major impact on potato tuber weight. External and internal tuber rot caused by both species increased with Pi levels. Ditylenchus destructor caused more tuber rot than D. dipsaci at all Pi levels. Reproduction rates of D. destructor were higher at all Pi levels studied compared to D. dipsaci. The equilibrium density of 1.3 and 0.6 for D. destructor and D. dipsaci, respectively, was observed at Pi level of 14.29 (g growing medium)−1.

Effect of initial population densities of Ditylenchus destructor and D. dipsaci on potato tuber damage and nematode reproduction

in Nematology

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References

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Figures

  • View in gallery

    Examples of percentage external and internal tuber damage levels on Solanum tuberosum cv. Désirée caused by Ditylenchus destructor and D. dipsaci. External damage was assessed as the percentage of the whole tuber with damage, while internal damage was assessed on one half of the tuber. This figure is published in colour in the online edition of this journal, which can be accessed via http://booksandjournals.brillonline.com/content/journals/15685411.

  • View in gallery

    The relation between initial population density (Pi) of Ditylenchus destructor (A, B), D. dipsaci (C) and potato tuber weight of Solanum tuberosum cv. Désirée. Data shown in A were generated during Experiment 1 and data in B and C were generated in Experiment 2. Lines were fitted according to the Seinhorst model for yield loss (Schomaker & Been, 2013).

  • View in gallery

    Mean external and internal potato tuber damage (Solanum. tuberosum cv. Désirée) caused by Ditylenchus destructor at various initial population densities (Pi) 12 weeks after infection with nematodes. Bars with the same letters are not significantly different according to Tukey’s studentised test (at P=0.05) (uppercase letters for external damage; lowercase letters for internal tuber damage).

  • View in gallery

    Mean external and internal potato tuber damage (Solanum tuberosum cv. Désirée) caused by Ditylenchus destructor at various initial population densities (Pi) 14 weeks after infection with nematodes during Experiment 2. Bars with the same letters are not significantly different according to Tukey’s studentised test (at P=0.05) (uppercase letters for external damage; lowercase letters for internal tuber damage).

  • View in gallery

    Mean external and internal potato tuber damage (Solanum tuberosum cv. Désirée) caused by Ditylenchus dipsaci at various initial population densities (Pi) 14 weeks after infection with nematodes during Experiment 2. Bars with same letters are not significantly different according to Tukey’s studentised test (at P=0.05) (uppercase letters for external damage; lowercase letters for internal tuber damage).

  • View in gallery

    Ditylenchus destructor and D. dipsaci nematode numbers extracted from potato tuber peels from Solanum. tuberosum cv. Désirée at different initial population densities (Pi). Bars with same letters are not significantly different according to Tukey’s studentised test (at P=0.05).

  • View in gallery

    Ditylenchus destructor and D. dipsaci final nematode numbers (Pf) extracted from growing medium at different initial population densities (Pi). Bars with same letters are not significantly different according to Tukey’s studentised test (at P=0.05).

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