Pesticidal Activity of Sundarban Mangrove Plant Extracts against Sitophilus Pests and Identification of Active Constituents Using LC-MS

Table 3

Insecticidal activity of the SPE4 fractions of A. corniculatum, E. agallocha, and H. fomes against S. oryzae insect at 2.0 mg/disc and their LC₅₀.

Name of plant	Fraction	No. of insects	No of dead adult insects			% of mortality	Lethal concentration 50% (LC50) mg/disc
			Days after treatment
			5^th	10^th	15^th
A. corniculatum (L.) blanco	SPE4	10	3.7 ± 0.3	7.3 ± 0.47	9.7 ± 0.5	97	0.5
E. agallocha (L.)	SPE4	10	2.0 ± 0.6	5.3 ± 0.5	9.0 ± 0.7	90	1.0
H. fomes (buch.)	SPE4	10	2.7 ± 0.3	4.3 ± 0.3	8.0 ± 0.6	80	1.5
Pemethrin	-	10	5.6 ± 0.8	6.3 ± 1.2	10 ± 0.0	100	0.4
Control (vehicle only)	-	10	0.0 ± 0.0	0.7 ± 0.3	1.0 ± 0.5	10	-

Results are expressed as mean ± SEM. vs. control.