Chrysoeriol isolated from Melientha suavis Pierre with activity against the agricultural pest Spodoptera litura

Chemical and Biological Technologies in Agriculture

Table 1 Toxicity of chrysoeriol isolated from M. suavis on second-instar larvae of S. litura at 24 and 48 h post-treatment

Dose (μg/larva)	Chrysoeriol		M. suavis crude extract		Cypermethrin
Dose (μg/larva)	24 h	48 h	24 h	48 h	24 h	48 h
LD₅₀^a	6.99	6.51	7.64	6.51	0.005	0.002
Chi-square	3.52	4.25	3.21	1.56	0.261	0.383
LD₅₀ LCL	5.65	5.26	7.51	6.62	0.003	0.001
LD₅₀ UCL	8.75	8.15	7.84	6.29	0.007	0.003
Slope ± SE	1.21 ± 0.10	1.20 ± 0.10	0.04 ± 0.10	0.04 ± 0.10	1.12 ± 0.24	0.56 ± 0.11

In each experiment, 10 larvae/treatment in six replicates were used (n = 60 per treatment)
LCL lower confidence limit, UCL upper confidence limit
^aLD₅₀ represents lethal dosage that kills 50% of the exposed larvae, expressed in μg/larva.