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Publication Type:
| Report |
Content Type: | Abstract or Summary only |
Author(s): | Hsiang, T.;
Yang, L.;
Barton, W. |
Author Affiliation: | Department of Environmental Biology, University of Guelph, Guelph, Ontario |
Title: | Baseline sensitivity and cross-resistance to demethylation-inhibiting fungicides in Ontario isolates of Sclerotinia homoeocarpa |
Source: | Phytopathology. Vol. 87, No. 6, June 1997, p. S44. |
Publishing Information: | St. Paul, MN: American Phytopathological Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Sclerotinia homoeocarpa; Fungicide resistance; DMI fungicides
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Abstract/Contents: | "A total of 435 isolates of Sclerotinia homoeocarpa from eight populations in southern Ontario were tested for sensitivity to the demethylation-inhibiting (DMI) fungicides, propiconazole, myclobutanil, fenarimol and tebuconazole. The isolates were collected in summer 1994 just prior to legal DMI fungicide use on turfgrass in Ontario. There were wide variations in sensitivities, and seven of the eight populations were very sensitive to the fungicides. Based on mean EC50 and the distribution of DMI sensitivity, one population near the U.S. border was suspected of having been previously exposed to DMI fungicide. Pairwise comparisons of EC50 values for the different fungicides showed low to moderate correlations between fungicides. EC50 values of myclobutanil and propiconazole had the best correlation, followed by the pair of tebuconazole and fenarimol. Other pairwise comparisons were not statistically significant except for myclobutanil vs. tebuconazole. For field populations of plant pathogens, cross-resistance to different DMI fungicides may not be as strong as conventionally thought. The data collected here will allow comparison to subsequent years to look for detectable shifts in S. homoeocarpa sensitivity to DMI fungicides as they become more frequently used in Ontario." |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Hsiang, T., L. Yang, and W. Barton. 1997. Baseline sensitivity and cross-resistance to demethylation-inhibiting fungicides in Ontario isolates of Sclerotinia homoeocarpa. Phytopathology. 87(6):p. S44. |
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