Table 1.

Toxicity of the studied essential oils to apterous females of M. persicae and R. padi.

Aphid Species	Essential Oil	LC50 a	95% CL b	Slope ± SE	χ2	P
M. persicae	S. chamaecyparissus	0.34	0.31−0.36	2.88 ± 0.22	29.29	0.843
	T. patula	0.61	0.56−0.67	2.67 ± 0.24	27.13	0.905
R. padi	S. chamaecyparissus	0.25	0.22−0.29	2.82 ± 0.18	27.63	0.884
	T. patula	0.31	0.27−0.35	2.73 ± 0.22	30.48	0.798

^a Lethal concentration (% w/v). ^b 95% confidence limit.