Table 1. Sources of Erysiphe necator isolates used in this study and their DMI sensitivities expressed as EC50 to three demethylation inhibitors.
| Isolate | Location, State | Coordinates | Collection year and month | EC50 | ||
|---|---|---|---|---|---|---|
| Tebuconazole | Myclobutanil | Fenarimol | ||||
| BLP1 | Blacksburg, VA | 37.242, -80.404 | 2005 Sep | 0.03 | 0.06 | 0.005 |
| BLP4 | Blacksburg, VA | 37.242, -80.404 | 2006 Jul | 0.03 | 0.34 | 0.01 |
| MVP9 | Nathalie, VA | 36.908, -79.109 | 2007 Sep | 0.02 | 0.13 | 0.03 |
| PBP1 | New Kent, VA | 37.529, -77.075 | 2006 Oct | 0.03 | 0.07 | 0.02 |
| SCCP4 | Dobson, NC | 36.382, -80.720 | 2006 Oct | 0.05 | 0.008 | 0.03 |
| SNP1 | White Hall, VA | 38.10, -78.78 | 2010 Jul | 0.03 | nt | nt |
| SNP3 | White Hall, VA | 38.10, -78.78 | 2010 Jul | 0.02 | nt | nt |
| FH9-1 | Glasgow, VA | 37.696, -79.487 | 2009 Oct | 0.01 | nt | nt |
| VAHP6 | Smith River, VA | 36.734, -80.194 | 2006 Oct | 0.60 | 4.40 | 0.34 |
| BXP1A | Bloxom, VA | 37.820, -75.623 | 2006 Jun | 0.17 | 0.85 | 0.11 |
| GRP15 | Shiloh, VA | 38.198, -77.069 | 2007 Aug | 0.46 | 0.003 | 0.29 |
| GRP18 | Shiloh, VA | 38.198, -77.069 | 2007 Aug | 0.45 | 7.87 | 0.18 |
| IVP3 | Washington, VA | 38.150, -77.001 | 2007 Aug | 0.04 | 0.03 | 0.03 |
| IVP11 | Washington, VA | 38.150, -77.001 | 2007 Aug | 1.68 | nt | 0.26 |
| MDMRP5 | Upper Marlboro, MD | 38.860, -76.780 | 2006 Sep | 0.56 | 4.60 | 0.11 |
| MDMRP7 | Upper Marlboro, MD | 38.860, -76.780 | 2006 Sep | 0.65 | 9.07 | 0.40 |
| PRP7 | Leon, VA | 38.436, -78.154 | 2007 Aug | 1.18 | 13.83 | 0.25 |
| ROP14 | Raphine, VA | 37.943, -79.242 | 2007 Aug | 0.70 | 7.00 | 0.19 |
| SUP13-2 | Stanardsville, VA | 38.326, -78.453 | 2005 Aug | 0.28 | 4.57 | 0.08 |
| VAHP1 | Smith River, VA | 36.734, -80.194 | 2006 Oct | 0.25 | 0.73 | 0.08 |
| AMP1 | Afton, VA | 38.008, -78.852 | 2007 Jul | 1.66 | 3.02 | 0.98 |
| IVP4 | Washington, VA | 38.150, -77.001 | 2007 Aug | 0.58 | 7.08 | 0.48 |
| JRP3 | Montpelier, VA | 37.836, -77.703 | 2006 Oct | 0.75 | 8.98 | 0.74 |
| VAHP4 | Smith River, VA | 36.734, -80.194 | 2006 Oct | 0.64 | 3.57 | 0.54 |
| JRP1 | Montpelier, VA | 37.836, -77.703 | 2006 Oct | 0.83 | 11.50 | 0.14 |
| JRP4 | Montpelier, VA | 37.836, -77.703 | 2006 Oct | 0.97 | 8.52 | 0.45 |
| JWP1 | Manheim, PA | 40.172, -76.438 | 2006 Oct | 3.50 | 6.00 | 1.33 |
| AF isolates | Boones Mill, VA | 37.101, -80.016 | 2010 Jun-Sep | nt | nt | nt |
| RO isolates | Raphine, VA | 37.943, -79.242 | 2010 Jul-Aug | nt | nt | nt |
| SC isolates | Dobson, NC | 36.382, -80.720 | 2010 Aug-Sep | nt | nt | nt |
nt = not tested