Impact of Bt cotton expressing single (Cry1Ac) and dual toxins (Cry1Ac and Cry2Ab) on the fitness of the predator Chrysoperla zastrowi sillemi (Esben-Petersen): prey-mediated tri-trophic analysis

Egyptian Journal of Biological Pest Control

Table 4 Predatory potential of Chrysoperla zastrowi sillemi fed on Phenacoccus solenopsis reared on Bt and non-Bt cotton cultivars

Chrysoperla stages	Mean number (± SE) of Phenacoccus solenopsis nymphs consumed per day when reared on
Chrysoperla stages	Bollgard (Cry1Ac)	Bollgard II (Cry1Ac and Cry2Ab)	Non-Bt	Mean
1st instar	14.2 ± 0.36	14.0 ± 0.33	14.3 ± 0.45	14.17 ± 0.38c
2nd instar	18.4 ± 0.34	18.2 ± 0.47	18.1 ± 0.41	18.23 ± 0.40b
3rd instar	35.9 ± 0.53	36.0 ± 0.60	36.1 ± 0.46	36.00 ± 0.53a
Mean	22.83 ± 0.41	22.73 ± 0.47	22.83 ± 0.44	–
ANOVA
Instars	F = 1803.73; df = 2.81; P < 0.001
Cultivars	F = 0.04; df = 2.81; P = 0.961
Interaction	F = 0.15; df = 4.81; P = 0.861

Means (± SE) followed by the same letter are not significantly different (LSD, P < 0.05)