Table 2.
Median lethal dose (LD50; probit analysis) comparison between hibiscus bud weevil (HBW) males and females (t-tests) for selected insecticides.
| Insecticide | Sex | n a | Slope b ± SE | LD50, µg/Weevil (95% CI) | χ2 | df | p-Value |
|---|---|---|---|---|---|---|---|
| Diflubenzuron c | ♂ | 50 | - | - | - | - | - |
| ♀ | 50 | - | - | - | - | - | |
| Spinetoram plus Sulfoxaflor | ♂ | 145 | 3.89 ± 0.34 | 0.06 (0.05–0.07) | 1.55 | 2 | 0.46 |
| ♀ | 147 | 3.74 ± 0.33 | 0.06 (0.06–0.07) | 2.26 | 2 | 0.32 | |
| Pyrethrins | ♂ | 180 | 1.00 ± 0.11 | 0.07 (0.03–0.16) | 6.30 | 3 | 0.10 |
| ♀ | 180 | 1.01 ± 0.11 | 0.10 (0.04–0.23) | 6.88 | 3 | 0.08 | |
| Spirotetramat | ♂ | 175 | 3.58 ± 0.29 | 41.72 (37.63–45.98) | 3.58 | 2 | 0.17 |
| ♀ | 152 | 3.26 ± 0.27 | 44.36 (39.81–49.16) | 3.92 | 2 | 0.14 |
a Total number of HBW adults tested. b Coefficient of the regression of log (dose) on HBW mortality used to calculate the LD50. c Because adult mortality was not observed 24 h after treatment at the max label rate, a probit analysis was not conducted for diflubenzuron.