Spatial and temporal impact of fungicide spray strategies on fungicide sensitivity of <Emphasis Type="Italic">Mycosphaerella graminicola</Emphasis> in winter wheat |
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| Authors: | Karin Thygesen Lise Nistrup Jørgensen Kim Skov Jensen Lisa Munk |
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| Institution: | 1.Department of Integrated Pest Management, Faculty of Agricultural Sciences,University of Aarhus,Slagelse,Denmark;2.Department of Plant Biology, Faculty of Life Sciences,University of Copenhagen,Frederiksberg C,Denmark |
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| Abstract: | Field experiments, involving various fungicide strategies with pyraclostrobin and/or epoxiconazole were carried out in 2004
and 2005, with the overall purpose of monitoring the evolution of fungicide sensitivity in Mycosphaerella graminicola on different isolates per leaf, leaf levels at different points of time, and points in the field. Sensitivity was assessed
on single isolates by means of epoxiconazole EC50-values, and monitoring of the G143A-mutation, which confers strobilurin resistance. In both years, fungicide application
strategies did not cause any significant shifts in epoxiconazole sensitivity of the population median or variance over time
compared to the starting population. In 2004, the end-population median was the same for all sprayed strategies, although
compared to untreated median sensitivities were higher. In 2005, epoxiconazole sensitivity levels were similar on individual
flag leaves and different points in the field. Measured on all isolates the EC50-values ranged from 0.007–1.15 mg l−1. In 2004, due to the high initial level of pyraclostrobin resistance, stabilisation of pyraclostrobin resistance was observed
following the various combination treatments. No correlation between epoxiconazole sensitivities and pyraclostrobin resistance
were observed. High input strategies using a mixture of epoxiconazole and pyraclostrobin resulted in the best control and
yield response. A subpopulation of the isolates from 2004 was also screened for sensitivity towards five different triazoles
of which tebuconazole proved to be least sensitive, and this could further be split into two subpopulations. |
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| Keywords: | Epoxiconazole Fungicide resistance Pyraclostrobin Triazole cross-resistance |
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