TABLE 4.
Verification of the accuracy of the tested resistance levels to seven insecticides in the field populations of S. frugiperda under the discriminating dose.
| Insecticide | Correlation equation | Population | Mortality under the diagnostic dose/% | Theoretical resistance ratio | Actual resistance ratio a | p-value b |
|---|---|---|---|---|---|---|
| chlorpyrifos | y = −11.7x + 105 | DY | 98.8 | 0.54 | 0.33 | 0.098 |
| HY | 86.3 | 1.61 | 1.62 | 0.940 | ||
| NN | 97.5 | 0.64 | 0.66 | 0.896 | ||
| bifenthrin | y = −2.45x + 92.6 | DY | 95.0 | 1.58 | 1.04 | 0.672 |
| HY | 83.8 | 3.63 | 3.20 | 0.795 | ||
| NN | 78.8 | 5.67 | 6.21 | 0.844 | ||
| deltamethrin | y = −1.33x + 95.2 | DY | 93.8 | 0.87 | 0.66 | 0.490 |
| HY | 86.3 | 6.16 | 6.26 | 0.819 | ||
| NN | 87.5 | 5.10 | 6.11 | 0.896 | ||
| lambda-cyhalothrin | y = −3.50x + 91.1 | DY | 91.3 | 1.02 | 1.00 | 0.969 |
| HY | 77.5 | 3.88 | 3.62 | 0.843 | ||
| NN | 73.8 | 4.95 | 5.13 | 0.890 | ||
| phoxim | y = −2.48x + 83.0 | DY | 62.5 | 8.27 | 4.62 | 0.253 |
| HY | 50.0 | 13.3 | 15.4 | 0.454 | ||
| NN | 60.0 | 9.27 | 11.3 | 0.428 | ||
| chlorantraniliprole | y = −21.1x + 106 | DY | 67.5 | 1.80 | 1.68 | 0.580 |
| HY | 98.8 | 0.32 | 0.28 | 0.511 | ||
| NN | 57.5 | 2.27 | 2.48 | 0.170 | ||
| chlorfenapyr | y = −12.2x + 103 | DY | 62.5 | 3.31 | 3.36 | 0.928 |
| HY | 81.3 | 1.77 | 2.11 | 0.464 | ||
| NN | 67.5 | 2.90 | 2.67 | 0.665 |
a
Actual resistance ratio = LC50 value of field population/LC50 value of susceptible strain.
b
p-value of less than 0.05 was thought to be statistically significant.