Larvicidal Activity of Cassia occidentalis (Linn.) against the Larvae of Bancroftian Filariasis Vector Mosquito Culex quinquefasciatus

Table 1

Observed and expected mortality of Culex quinquefasciatus larvae exposed to Cassia occidentalis with petroleum ether and N-butanol extracts. Expected mortality is based on probit regression analysis.

Conc. (𝜇g/mL)	Number of larvae		Mortality (%)		Expected mortality			LC50   (95% CI)	LC90  (95% CI)	Probit (mortality)  = 𝑎+𝑏×conc.	𝜒^2; D.F.; 𝑃 value
	Exposed	Dead	Crude	Corrected	Probit	Dead	%
Cassia occidentalis with petroleum ether
40	75	15	20	20	−1.00	12.0	16.0	98.4  (89.1–107.2)	173.8 (160.6–191.5)	−1.6756+0.0170×conc.	𝜒^2=6.20; D.F. = 3; 𝑃=0.1
80	75	28	37.4	37.4	−0.32	28.2	37.6
120	75	43	57.4	57.4	0.36	48.2	64.2
160	75	62	82.7	82.7	1.04	63.9	85.2
200	75	75	100	100	1.72	71.8	95.8
Cassia occidentalis with N-butanol
50	75	3	4	4	−2.09	1.4	1.8	161.6  (152.8–170.5)	230.0  (217.8–245.5)	−3.0289+0.0187×conc.	𝜒^2=3.24; D.F. = 4; 𝑃=0.5
100	75	7	9.4	9.4	−1.16	9.2	12.3
150	75	31	42.7	42.7	−0.22	30.9	41.1
200	75	56	74.7	74.7	0.71	57.1	76.1
250	75	72	96	96	1.65	71.3	95.0
300	75	75	100	100	2.58	74.6	99.5

D.F.: degrees of freedom.