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Yield reduction in wheat in relation to leaf necrosis caused by Septoria tritici

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Abstract

In 1980, field inoculations withSeptoria tritici were performed on winter wheat cv. Okapi. Leaf necrosis progress curves were established; they were sigmoid and could be transformed into logit lines. There was a great difference in the slope of the logit lines between inoculated plots and non-inoculated controls. The mid-time values varied according to inoculum dosage and post-inoculation humidity treatment. Yields (kg ha−1) and average grain weights (mg grain−1) differed significantly between inoculated and non-inoculated plots, but seldom among inoculation treatments. Decrease of average grain weight completely explained yield loss, which was 878 kg ha−1 or 12% of control (7045 kg ha−1). This crop loss is considerable for a cultivar which is not particularly susceptible. A good correlation was found between the amount of necrosis at development stages DC=75 and 77 and yield depression. The integral of necrosis over time gave a high correlation with loss of kernel weight.

Samenvatting

In 1980 werden inoculaties verricht metSeptoria tritici in een veldproef met wintertarwe ‘Okapi’. De bladnecrose-voortschrijdingscurves werden bepaald. De S-vormige curves konden getransformeerd worden tot logit-lijnen. De geïnoculeerde en niet geïnoculeerde objecten verschilden aanzienlijk in de hellingen van de logit-lijnen. De halfwaardetijden varieerden al naar inoculatiedosis en vochtbehandeling na inoculatie. De verschillen in opbrengst (kg ha−1) waren significant voor geïnoculeerd tegenover niet-geïnoculeerd. De opbrengstderving van 878 kg ha−1 (gelijk aan 12% van de niet-geïnoculeerde controle 7045 kg ha−1)werd volledig verklaard door de vermindering van het korrelgewicht. De schade is aanzienlijk voor een cultivar die niet bijzonder vatbaar is. De opbrengstderving correleerde goed met de hoeveelheid necrose waargenomen bij de ontwikkelingsstadia DC=75 en DC=77. De necrose geïntegreerd over de tijd correleerde goed met de verlaging van het korrelgewicht.

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Authors and Affiliations

  1. Swiss Federal Research Station for Agronomy, Reckenholzstrasse 191/211, 8046, Zürich, Switzerland

    H. R. Forrer

  2. Laboratory of Phytopathology, Binnenhaven 9, 6709 PD, Wageningen, the Netherlands

    J. C. Zadoks

Authors
  1. H. R. Forrer
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  2. J. C. Zadoks
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Forrer, H.R., Zadoks, J.C. Yield reduction in wheat in relation to leaf necrosis caused by Septoria tritici. Netherlands Journal of Plant Pathology 89, 87–98 (1983). https://doi.org/10.1007/BF01976347

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  • DOI: https://doi.org/10.1007/BF01976347

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