Composition, Repellent, and Insecticidal Activities of Two South American Plants against the Stored Grain Pests Tribolium castaneum and Tribolium confusum (Coleoptera: Tenebrionidae)

Table 5

Contact activity of EOs of Aloysia polystachya, and Aloysia citriodora determined by topical application to T.  castaneum.

Essential oil	LD50^a	95% CI^c	LD95^b	95% CI^c	Slope ± SE^d	𝑋^2
A. polystachya	7.35^a	(6.38–8.5)	21.95	(16.6–34.5)	3.46±0.47	7.37
A. citriodora	13.8^b	(9.5–43.7)	124	(41–158.2)	1.71±0.59	0.4

^aLD₅₀: lethal dose 50 (𝜇g insect⁻¹); ^bLD₉₅: lethal dose 95 (𝜇g insect⁻¹); ^cCI 95%: confidence interval of 95%; ^dSE: standard error. Numbers in the same column followed by the same letters do not differ significantly.