Toxicity of six plant extracts and two pyridone alkaloids from Ricinus communis against the malaria vector Anopheles gambiae

Table 4 Larvicidal activity of plant extracts against 3 ^rd Instar larvae of An. gambiae s.s. after 24 h of exposure

Plant extract	χ²	Regression equation	LC₅₀(mg/mL)	LCL-UCL(mg/mL)	LC₉₀(mg/mL)	LCL-UCL(mg/mL)
A. afra	3.03	y = 5.03 + 2.07x	0.96	0.75 - 1.44	4.01	2.34 - 10.83
B. pilosa	0.81	y = 5.26 + 1.25x	0.62	0.45 - 1.02	6.54	2.77 - 47.25
P. hysterophorus	3.52	y = 4.61 + 1.41x	1.88	1.13 - 6.17	15.21	5.04 - 250.69
T. diversifolia	2.73	y = 5.35 + 2.63x	0.74	0.62 - 0.94	2.27	1.60 - 4.04
R. communis	0.79	y = 6.13 + 2.87x	0.40	0.35 - 0.47	1.13	0.89 - 1.59
S. didymobotrya	0.52	y = 5.86 + 3.08x	0.53	0.46 - 0.62	1.37	1.08 - 1.97
A. indica	0.67	y = 5.899 + 2.54x	0.44	0.38 - 0.53	1.41	1.06 - 2.18

LC₅₀ and LC₉₀ lethal concentration that kills 50% and 90% of An. gambiae s.s. larvae exposed to the extracts, LCL lower confidence limit, UCL upper confidence limit based on 95% Confidence interval, χ² chi-square values.

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