TABLE 2.
Comparative assessment of insecticidal proteins in insect feeding assays using susceptible and Vip3A-resistant fall armyworms, Spodoptera frugiperda
| Sample | S. frugiperda colonya | No. of insectsb | Mean slope ± SE | LC50 (ng/cm2) (95% CI)c | χ2 | dfd | Resistance ratioe |
|---|---|---|---|---|---|---|---|
| Cry1Da_7 | SS | 1,023 | 1.85 ± 0.18 | 12 (9–15) | 13.36 | 26 | 1 |
| Vip3A-RR | 1,088 | 11 | −1.1 | ||||
| Cry1B.868 | SS | 1,021 | 3.69 ± 0.73 | 262 (192–363) | 30.64 | 26 | 1 |
| Vip3A-RR | 1,088 | 2.34 ± 0.16 | 43 (37–49) | 16.77 | 30 | −6.6 | |
| Vip3A | SS | 1,024 | 1.85 ± 0.21 | 333 (237–475) | 83.03 | 26 | 1 |
| Vip3A-RR | 1,082 | >31,600f | >94.8 |
a
SS, Vip3A-susceptible insect colony; Vip3A-RR, Vip3A-resistant insect colony.
b
Total number of insects evaluated.
c
CI, confidence interval.
d
df, degree of freedom.
e
Calculated from the LC50 of the Vip3A-RR colony divided by the LC50 of the SS colony.
f
Assumes that LC50 for Vip3A in the Vip3A-RR colony is >31,600 ng/cm2 (31,600 ng/cm2 is the highest dose tested).