TABLE 1.
Responses to B. thuringiensis proteins by pink bollworm larvae of susceptible (APHIS-S) and resistant (APHIS-98R and AZP-R) strains
| ICPa | Concn (μg/g of diet) | % Survivalb
|
|
|---|---|---|---|
| Susceptible strain | Resistant strain | ||
| Tests of protoxins with APHIS-98R as the resistant strain | |||
| Cry1Aa | 1 | 0 | 100 |
| 10 | 0 | 86 | |
| Cry1Ab | 1 | 0 | 100 |
| 10 | 0 | 79 | |
| Cry1Ac | 1 | 0 | 97 |
| 10 | 0 | 86 | |
| Cry1Bb | 1 | 72 | 72 |
| 10 | 17 | 48 | |
| Cry1Ca | 1 | 34 | 38 |
| 10 | 0 | 0 | |
| Cry1Da | 1 | 0 | 0 |
| 10 | 0 | 0 | |
| Cry1Fa | 1 | 100 | 100 |
| 10 | 97 | 90 | |
| Cry1Ja | 1 | 6 | 58 |
| 10 | 0 | 0 | |
| Cry2Aa | 1 | 0 | 0 |
| 10 | 0 | 0 | |
| Cry9Cac | 1 | 0 | 0 |
| 10 | 0 | 0 | |
| Tests of protoxins with AZP-R as the resistant strain | |||
| Cry1Aa | 10 | 0 | 30 |
| Cry1Ab | 10 | 0 | 70 |
| Cry1Ac | 10 | 0 | 53 |
| MVP IId | 10 | 0 | 90 |
| Cry1Bb | 10 | 0 | 20 |
| Cry1Ca | 10 | 0 | 0 |
| Cry1Da | 10 | 0 | 0 |
| Cry1Fa | 10 | 94 | 93 |
| Cry1Ja | 10 | 0 | 0 |
| Cry2Aa | 10 | 0 | 0 |
| Tests of activated toxins with AZP-R as the resistant strain | |||
| Trial 1 | |||
| Cry1Ab | 1 | 0 | 81 |
| 10 | 0 | 73 | |
| Cry1Ca | 1 | 0 | 0 |
| 10 | 0 | 0 | |
| H04 | 1 | 0 | 0 |
| 10 | 0 | 0 | |
| H205 | 1 | 67 | 69 |
| 10 | 13 | 0 | |
| Trial 2 | |||
| Cry1Ab | 1 | 0 | 83 |
| 10 | 0 | 48 | |
| Cry1Ca | 1 | 0 | 0 |
| 10 | 0 | 0 | |
| H04 | 1 | 0 | 0 |
| 10 | 0 | 0 | |
| H205 | 1 | 3 | 0 |
| 10 | 0 | 0 | |
| Cry1Ea | 1 | 0 | 0 |
| 10 | 0 | 0 | |
a
ICP protoxins were obtained as powders from Ecogen (see text) unless noted otherwise.
b
Adjusted survival (see the text).
c
Protoxin was obtained as a powder from Plant Genetic Systems.
d
MVP II contains a hybrid protoxin in which the active toxin fragment is from Cry1Ac (see text).