期刊
PHYTOPATHOLOGY
卷 101, 期 10, 页码 1224-1233出版社
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PHYTO-10-10-0290
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资金
- Chemicals Regulation Directorate of the Health and Safety Executive
- Department for Food and Rural Affairs
- Biotechnology and Biological Sciences Research Council of the United Kingdom
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00004942] Funding Source: researchfish
- BBSRC [BBS/E/C/00004942] Funding Source: UKRI
Hobbelen, P. H. F., Paveley, N. D., and van den Bosch, F. 2011. Delaying selection for fungicide insensitivity by mixing fungicides at a low and high risk of resistance development: A modeling analysis. Phytopathology 101:1224-1233. This study used mathematical modeling to predict whether mixtures of a high-resistance-risk and a low-risk fungicide delay selection for resistance against the high-risk fungicide. We used the winter wheat and Mycosphaerella graminicola host-pathogen system as an example, with a quinone outside inhibitor fungicide as the high-risk and chlorothalonil as the low-risk fungicide. The usefulness of the mixing strategy was measured as the effective life: the number of seasons that the disease-induced reduction of the integral of canopy green area index during the yield forming period could be kept <5%. We determined effective lives for strategies in which the dose rate (i) was constant for both the low-risk and high-risk fungicides, (ii) was constant for the low-risk fungicide but could increase for the high-risk fungicide, and (iii) was adjusted for both fungicides but their ratio in the mixture was fixed. The effective life was highest when applying the full label-recommended dose of the low-risk fungicide and adjusting the dose of the high-risk fungicide each season to the level required to maintain effective control. This strategy resulted in a predicted effective life of <= 12 years compared with 3 to 4 years when using the high risk fungicide alone.
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