Table 8.
Comparisons of topically applied methomyl bioassay on S. frugiperda between resistant or susceptible native populations from USA (FL) and invasive populations from South and Australia
| Populations | LC50 (ppm) | Fiducial limits (95%) | Slope ± SE | Toxicity ratios |
|---|---|---|---|---|
| USA (FL susceptible) | 0.57 | 0.45–0.78 | 4.9 | – |
| South Africa | 62.98 | 17.22–52.12 | 11.14 ± 9.20 | 110.5 |
| Sf20-1 (Qld) | 0.254 | 0.177–0.356 | 1.064 ± 0.076 | 0.45 |
| Sf20-4 (WA) | 2.96 | 1.87–4.66 | 0.874 ± 0.07 | 5.2 |
| USA (FL resistance) | 8.23 | 4.86–11.6 | 2.9 | – |
| South Africa | 62.98 | 17.22–52.12 | 11.14 ± 9.20 | 7.65 |
| Sf20-1 (Qld) | 0.254 | 0.177–0.356 | 1.064 ± 0.076 | 0.031 |
| Sf20-4 (WA) | 2.96 | 1.87–4.66 | 0.874 ± 0.07 | 0.36 |
Comparisons of topically applied methomyl bioassay results on late 3rd and/or early 4th instar larvae of S. frugiperda between resistant or susceptible populations from Gainesville Florida, USA (FL) (Yu 1991; see Discussion above), and invasive populations from South Africa (Eriksson 2019; see Discussion above) and Queensland or Western Australia, Australia. LC50 (50% lethal concentration): The concentration of each pesticide required to kill 50% of the test subject. Fiducial limits are similar to confidence limits but are based on logistic growth or S-shaped curve distribution.