Table 1.
Bioassays of the insecticidal mixtures of purified chitinases and YBT-1520 spore-ICP preparations against Helicoverpa armigera.
| Samples a | Linear regression equation b | Linearly dependent coefficient b | LC50 (μg·mL-1) |
95% confidence bounds (μg·mL-1) |
|---|---|---|---|---|
| Chi9602 | - | - | >1000 | - |
| ChiW50A | - | - | >1000 | - |
| YBT-1520 | Y= -5.207+2.064X | 0.9444 | 4.70 | 4.058~5.466 |
| YBT-1520 + Chi9602 | Y= -8.315+3.192X | 0.9653 | 3.88 | 3.384~4.413 |
| YBT-1520 + ChiW50A | Y= -5.963+2.460X | 0.9995 | 3.27 | 2.826~3.719 |
Note: a, Sample initial concentration: Chi9602, 35 μg/mL; ChiW50A, 35 μg/mL; YBT-1520, 35 mg/mL; YBT-1520 + Chi9602/ChiW50A, 35 mg/mL (YBT-1520) and 35 μg/mL (Chi9602 or ChiW50A) at the final concentration. The sample solutions were diluted to 1, 1/2, 1/4, 1/8 and 1/16 diluents with sterile ddH2O for bioassays; b, PROBIT model of lethal-concentration.