Table 2. Dose-response assays of spore/crystal mixtures of selected Bt isolatesa.
| S. exigua | S. littoralis | O. nubilalis | ||||
|---|---|---|---|---|---|---|
| Isolate | Slope±SE | LC50 (ng/cm2) FL95% (min.-max.) |
Slope±SE | LC50 (ng/cm2) FL95% (min.-max.) |
Slope±SE | LC50 (ng/cm2) FL95% (min.-max.) |
| HD1 | 1.05±0.13 | 48 (30–74) | 1.07±0.12 | 15.6 (8.7–28.1) | 1.45±0.19 | 6.7 (3.2–11.5) |
| 6A | 1.94±0.24 | 113 (83–154) | 1.61±0.18 | 19 (12–31) | 1.82±0.22 | 3.5 (2.0–5.7) |
| 13MY | - | 1.54±0.20 | 1.31 (0.59–2.18) | - | ||
| 19Q2 | 1.76±0.23 | 270 (175–444) | - | - | ||
| 19Q3 | - | - | - | |||
| 42MY | 2.39±0.26 | 51 (26–92) | 1.62±0.21 | 2.8 (1.4–4.4) | 1.39±0.18 | 4.5 (2.0–7.8) |
| 43MY | - | - | 1.44±0.17 | 5.8 (2.8–10.7) | ||
| 44MY | - | - | 1.81±0.22 | 2.5 (1.5–4.0) | ||
| 45MY | 2.11±0.24 | 33 (25–42) | 1.75±0.19 | 1.57 (0.94–2.50) | 1.26±0.13 | 3.3 (2.1–5.3) |
| 51MY | 1.37±0.16 | 23 (12–42) | 1.27±0.19 | 2.21 (0.55–4.44) | 1.71±0.21 | 4.5 (2.1–9.1)) |
| 60Q1 | - | - | 1.15±0.15 | 28 (14–52) | ||
| 60Q2 | - | - | 1.22±0.15 | 27 (14–52) | ||
| 70MY | - | 1.51±0.16 | 27 (17–41) | 1.67±0.21 | 5.1 (1.9–11.3) | |
| 85PPb | - | 1.40±0.17 | 5.1 (2.7–9.2) | - | ||
| 125Q | - | - | - | |||
| Bt-BY7 | 1.27±0.15 | 29 (10–72) | 1.32±0.17 | 11.8 (6.0–19) | 1.46±0.17 | 4.2 (2.8–6.7) |
| Bt-KE63-64 | - | 1.20±0.17 | 11.7 (5.9–22) | - | ||
| Bt-KH3 | 1.19±0.16 | 58 (24–116) | - | 1.79±0.22 | 5.5 (3.8–7.6) | |
| Bt-KH58 | 1.20±0.16 | 15 (9–24) | 1.14±0.14 | 11.0 (6.9–16) | 1.19±0.11 | 8.1 (4.7–13.4) |
a Only those isolates that showed higher insecticidal activity than the HD1 reference strain were selected for the dose-response assays