Table 7.
Frequency of SDHI‐resistant strains in Z. tritici field populations. Frequencies (%) of low and highly resistant fluopyram, isofetamid and bixafen strains within populations are presented
| Locationa | Year | n | EC50 (mg L−1) | |||||
|---|---|---|---|---|---|---|---|---|
| Fluopyram | Isofetamid | Bixafen | ||||||
| > 0.5 | > 5.0 | > 0.5 | > 5.0 | > 0.3 | > 3.0 | |||
| Harpenden (UK) | 2003 | 27 | 3.7 | 0 | 7.4 | 7.4 | 0 | 0 |
| 2010 | 39 | 7.7 | 2.6 | 15.4 | 12.8 | NT | NT | |
| 2015 | 46 | 23.9 | 2.2 | 28.3 | 23.9 | 2.2 | 0 | |
| 2017 | 36 | 50 | 11.1 | 33.3 | 30.6 | 19.4 | 0 | |
| Carlow (Ireland) | 2003 | 42 | 7.1 | 0 | 7.1 | 7.1 | 0 | 0 |
| 2017 | 46 | 80.4 | 4.3 | 45.6 | 15.2 | 76.1 | 0 | |
| Middlesborough (UK) | 2003 | 38 | 2.6 | 0 | 2.6 | 2.6 | 0 | 0 |
| Long Ashton (UK) | 2003 | 39 | 10.3 | 0 | 10.3 | 7.7 | 0 | 0 |
| New Zealand | 2004 | 39 | 20.5 | 0 | 23.1 | 20.5 | 0 | 0 |
| New Plymouth (NZ) | 2008 | 24 | 41.7 | 0 | 41.7 | 33.3 | 0 | 0 |
| Lyon (France) | 2015 | 33 | 15.2 | 6.1 | 12.1 | 12.1 | 3 | 0 |
| Orleans (France) | 2015 | 32 | 18.8 | 3.1 | 18.8 | 18.8 | 3.1 | 0 |
a
Populations were sampled from untreated crops at the same location with exception of the 2004 New Zealand population that contains strains sampled from one location in the North Island and four different locations on the South Island.