Table 2. Mortality and development time of Chrysoperla carnea larvae when fed maize pollen during one larval stage and Ephestia kuehniella eggs in the other two stages (L1–L3) (experiment 2). Control treatments were no food in larval stage 1, 2, or 3, and E. kuehniella eggs in all stages. For statistical comparisons, logistic regression on mortality and ANOVA on development time (log transformed) were performed. Fixed factors were maize cultivar, trial, and the larval stage that was fed pollen. The model was full factorial. The control treatments were excluded from statistical analyses.
| Treatment | Mortality L1–L3 [%] (N)1 | Development time L1–L3 [days ± SE] (N)2 |
|---|---|---|
| Control treatments | ||
| E. kuehniella eggs | 2 (47) | 8.56 ± 0.11 (46) |
| no food | 97 (87) | 10.00 ± 0.00 (3) |
| Maize pollen treatments | ||
| DKC5143Bt (Bt) | 36 (89) | 11.40 ± 0.24 (57) |
| DKC5143 | 26 (88) | 11.56 ± 0.19 (65) |
| DKC3421YG (Bt) | 21 (87) | 11.27 ± 0.20 (69) |
| DKC3420 | 21 (89) | 11.31 ± 0.21 (70) |
| Experimental trials | ||
| Trial 1 | 23 (177) | 11.85 ± 0.14 (137) a |
| Trial 2 | 30 (176) | 10.87 ± 0.14 (124) b |
| Pollen feeding stage | ||
| Pollen feeding L1 | 42 (115) A | 12.10 ± 0.20 (67) A |
| Pollen feeding L2 | 13 (119) C | 10.94 ± 0.13 (103) B |
| Pollen feeding L3 | 24 (119) B | 11.36 ± 0.21 (91) B |
1Logistic regression: cultivar n.s., trial n.s., pollen-feeding stage p < 0.0001, Wald = 21.8, all interactions n.s.
2ANOVA: cultivar n.s., trial p < 0.0001, F1, 237 = 17.8, pollen-feeding stage p < 0.0001, F2, 237 = 11.5, stage × trial p = 0.0003, other interactions n.s.