Efficacy of Bacillus thuringiensis israelensis (Bti) and four plant extracts on the mortality and development of Culex quinquefasciatus Say (Diptera: Cullicidae)

Egyptian Journal of Biological Pest Control

Table 1 Relative toxicity of Bacillus thuringiensis var. israelensis and four plant extracts against Culex quinquefasciatus after 24- and 48-h exposure

Treatments	LC₅₀^a (mg/l) 24 h	LC₅₀^b (mg/l) 48 h	95% Confidence limits (mg/l)		Slope ± SE^c	Relative toxicity
Treatments	LC₅₀^a (mg/l) 24 h	LC₅₀^b (mg/l) 48 h	Lower	Upper	Slope ± SE^c	Relative toxicity
Bacillus thuringiensis var. israelensis	7.184	3.987	4.704	15.431	0.733 ± 0.159	7.38
Nigella sativa	14.593	7.936	7.98	63.7	0.666 ± 0.163	3.63
Cinnamomum osmophloeum	28.879	17.165	13.869	147.264	0.767 ± 0.161	1.83
Matricaria chamomilla	36.96	14.093	17.63	176.890	0.651 ± 0.180	1.43
Seasamum indicum	53.055	20.744	17.159	270.132	0.692 ± 0.166	1.00