TABLE 2.
Cross-resistance of AR to MVP II
| Strain | Ga | Total no. of insects testedb | LC50 (95% FL)c | Slope (mean ± SE) | RRd | MVP II/Cry1Ac ratioe |
|---|---|---|---|---|---|---|
| AR | 7 (36) | 192 | 117.79 (63.38-175.45) | 1.81 ± 0.34 | 4.7 | 0.37 |
| SCf | 1,120 | 24.84 (13.48-41.89) | 2.47 ± 0.57 | 2.78 | ||
| AR | 11 (123) | 576 | 197.10 (134.1-333.51) | 1.36 ± 0.29 | 7.9 | 0.14 |
| SC | 576 | 24.94 (13.86-44.87) | 2.57 ± 0.37 | 2.11 | ||
| AR | 16 (>100) | 448 | 397.93 (245.87-749.86) | 1.56 ± 0.42 | 10.3 | 0.28 |
| SC | 448 | 38.53 (24.87-55.56) | 2.41 ± 0.53 | 2.76 |
a
G, generations of H. zea continuously selected with Cry1Ac activated toxin; values in parentheses indicate the RR to Cry1Ac-activated toxin.
b
One to five replicates with one to seven concentrations.
c
LC50 values are presented in micrograms of Cry1Ac in MVP II per gram of diet. FL, fiducial limits.
d
The LC50 for AR divided by the LC50 for SC.
e
The ratio of LC50 values for MVP II divided by the LC50 values for Cry1Ac activated toxin (data from Table 1).
f
SC, susceptible colony.