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Bioassay of Bacillus thuringiensis isolates against the 1st instar larvae of Spodoptera exigua.
| Bt isolate | Instar | Regression equation | LC50 (mg/ml) | 95% Confidence limite |
|---|---|---|---|---|
| Bt GS57 | 1st instar larvae | y = 0.599 + 1.267x | 0.337 | 0.214 ~ 0.501 |
| Bt GS57△pyrE | 1st instar larvae | y = 0.369 + 0.765x | 0.329 | 0.169 ~ 0.563 |
LC50 is the concentration lethal to half of S. exigua larvae at 72 h. N = 15 (the number of larvae treated), biological repeat three times.
