Table 3. LC50 value and resistance ratio for oxazosulfyl, imidacloprid and fipronil against the susceptible strains and field populations of planthoppers.
| Insecticide | Speciesa) | Strain/Populationb) | LC50c) | CI 95% | Slope | RRd) |
|---|---|---|---|---|---|---|
| Oxazosulfyle) | BPH | S | 0.41 | 0.32–0.51 | 2.4 | — |
| Kagoshima | 0.78 | 0.61–0.97 | 2.4 | 1.9 | ||
| WBPH | S | 0.82 | 0.65–1.06 | 2.3 | — | |
| Kagoshima | 0.69 | 0.55–0.87 | 2.2 | 0.8 | ||
| SBPH | S | 0.61 | 0.48–0.79 | 2.1 | — | |
| Kagoshima | 0.23 | 0.16–0.30 | 1.7 | 0.4 | ||
| Imidacloprid | BPH | S | 0.19 | 0.14–0.24 | 1.8 | — |
| Kagoshima | 106.29 | 79.49–143.90 | 1.5 | 568.4 | ||
| WBPH | S | 0.17 | 0.14–0.21 | 2.2 | — | |
| Kagoshima | 1.85 | 1.45–2.33 | 2.4 | 10.9 | ||
| SBPH | S | 0.18 | 0.13–0.24 | 2.5 | — | |
| Kagoshima | 5.32 | 3.03–9.18 | 0.9 | 30.2 | ||
| Fipronil | BPH | S | 0.26 | 0.21–0.32 | 2.6 | — |
| Kagoshima | 2.37 | 1.87–2.98 | 2.2 | 9.1 | ||
| WBPH | S | 0.17 | 0.13–0.21 | 2.3 | — | |
| Kagoshima | 12.06 | 9.28–15.53 | 2.0 | 71.0 | ||
| SBPH | S | 0.23 | 0.18–0.28 | 2.5 | — | |
| Kagoshima | 3.72 | 2.24–6.10 | 1.0 | 16.5 |
a) BPH; N. lugens, WBPH; S. furcifera, WBPH; L. stnatellus, b) S; susceptible strains, Kagoshima; field populations collected from rice field in 2018, Kagoshima, c) mg a.i./L, d) RR (resistance ratio)=LC50 value of field strains/LC50 value of susceptible strains. e) Data from Table 1.