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

Table 5 Larvicidal activity of plant extracts against 3 ^rd Instar larvae of An. gambiae s.s. after 72 h of exposure

Plant extract	χ²	Regression equation	LC₅₀(mg/mL)	LCL-UCL(mg/mL)	LC₉₀(mg/mL)	LCL-UCL(mg/mL)
A. afra	3.074	y = 6.98 + 2.94x	0.21	0.18 - 0.25	0.58	0.47 - 0.78
B. pilosa	1.75	y = 7.10 + 3.08x	0.21	0.18 - 0.24	0.54	0.45 - 0.72
P. hysterophorus	0.15	y = 6.44 + 2.09x	0.21	0.16 - 0.25	0.84	0.63 - 1.33
T. diversifolia	3.49	y = 6.94 + 4.00x	0.33	0.29 - 0.37	0.68	0.58 - 0.86
R. communis	0.91	y = 8.17 + 4.21x	0.18	0.15 - 0.20	0.36	0.30 - 0.45
S. didymobotrya	2.98	y = 6.93 + 3.36x	0.27	0.23 - 0.30	0.64	0.53 - 0.83
A. indica	2.758	y = 7.00 + 2.73x	0.19	0.15 - 0.22	0.55	0.44 - 0.75

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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