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Effects of fungicides used to control Rhynchosporium secalis where benzimidazole resistance is present |
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| Authors: | PJ Taggart LR Cooke PC Mercer MW Shaw |
| Institution: | a Department of Applied Plant Science, The Queen's University of Belfast, Newforge Lane, Belfast, Northern Ireland BT9 5PX, UK b Applied Plant Science Division, Department of Agriculture for Northern Ireland, Newforge Lane, Belfast, Northern Ireland BT9 5PX, UK c Department of Agricultural Botany, The University of Reading, 2 Earley Gate, Whiteknights, Reading RG6 6AU, UK |
| Abstract: | The effects of fungicides used to control Rhynchosporium secalis in winter barley were investigated in five field trials in Co. Down, Northern Ireland. Benzimidazole resistance was present in the R. secalis population of each site. Fungicide performance was evaluated in terms of disease control, maintenance of green leaf area, grain yield and grain quality. Samples of R. secalis isolates taken before and after treatment in each field were assessed for sensitivity to carbendazim in the laboratory. Carbendazim contributed little to disease control, the maintenance of green leaf area, grain yield or grain quality. Carbendazim was associated with a significant increase in disease severity in some plots. Treatments containing carbendazim, either alone or in mixture, caused an increase in the proportion of carbendazim-resistant isolates within R. secalis populations. Propiconazole-containing treatments performed well in terms of disease control, maintenance of green leaf area and grain quality. They caused no change in carbendazim resistance frequency. |
| Keywords: | Rhynchosporium secalis carbendazim fungicide resistance |
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