Table 3. Toxicity to bifenazate of T. urticae populations collected in 2013.
| Population | Date | N | % Mortalitya | LC50 (mg a.i./L) | 95% CI | Slope ± SEM | RRb | X2 | df |
|---|---|---|---|---|---|---|---|---|---|
| Granger 1 | 30 Aug | 157 | 82 | 47.86 | 11.39 –138.08 | 1.72 ± 0.22 | 58.37 | 3.07 | 2 |
| *Granger 2c | 16 Jul | 120 | 100 | 3.93 | 0.34–7.11 | 1.89 ± 0.64 | 4.79 | 0.02 | 1 |
| *Granger 3 | 20 Aug | 197 | 76 | 78.97 | 55.99 –107.50 | 1.71 ± 0.19 | 96.30 | 2.49 | 3 |
| *Granger 5 | 25 Jul | 160 | 93 | 4.88 | 0.89–10.76 | 0.99 ± 0.21 | 5.95 | 1.87 | 2 |
| *Mabton 1 | 27 Jun | 60 | 96 | – | – | – | – | – | – |
| *Mabton 2 | 27 Jun | 60 | 96 | – | – | – | – | – | – |
| *Moxee 1 | 18 Jul | 160 | 90 | 18.88 | 9.71–30.14 | 1.38 ± 0.22 | 23.02 | 1.95 | 2 |
| *Prosser 1 | 14 Jul | 60 | 100 | – | – | – | – | – | – |
| *Prosser 2 | 28 Jul | 160 | 85 | – | – | 1.44 ± 0.21 | – | 3.23 | 2 |
| Prosser 3 | 29 Jul | 160 | 88 | 25.49 | 3.87–66.98 | 1.50 ± 0.21 | 31.09 | 2.51 | 2 |
| *Prosser 4 | 08 Sep | 160 | 90 | 6.87 | 1.36–13.66 | 1.58 ± 0.42 | 8.38 | 0.72 | 2 |
| *Prosser 5 | 24 Jul | 157 | 95 | 9.31 | 3.91–15.69 | 1.29 ± 0.29 | 11.35 | 0.95 | 2 |
a% Mortality stands for the % mortality at ¼ the field rate of bifenazate, which is 224 mg a.i./L.
bRR represents Resistance Ratio = LC50 of field population/ LC50 of the susceptible population.
cOrganic hopyard.
*Molecular data shown in Table 4. -No data available.