Table 1. Mortality (48-h LC₅₀ and To instar 3 LC₅₀) and feeding inhibition (FI EC₅₀) endpoints of imidacloprid, fipronil and fipronil sulfoneto S. infuscatum and S. frequens.

		48-h LC50	FI EC50	To instar 3 LC50
		(μg/L)	(μg/L)	(μg/L)
		Estimate (95% CI)	Estimate (95% CI)	Estimate (95% CI)
	Imidacloprid	-	-	4130 (1370–12454)
S. infuscatum	Fipronil	1020 (421–2469)	29.3 (10.7–47.9)	8.4 (5.6–12.6)
	Fipronil sulfone	362 (164–795)	3.0 (0.7–5.2)	0.8 (0.6–1.1)
	Imidacloprid	227 (123–516)	6.7 (3.7–12.1)	41.8 (30.1–58.0)
S. frequens	Fipronil	2775 (579–13302)	2.9 (1.9–4.5)	9.1 (6.7–12.5)
	Fipronil sulfone	421 (165–1071)	1.0 (0.7–1.4)	1.0 (0.8–1.4)

LC₅₀ of the 48-h acute toxicitytest and instar 3 larvae and FI EC₅₀ of S. frequens were estimated by probit analysis. FI EC₅₀ of S. infuscatum was estimated by dose-response curve analysis (S1 and S2 Figs).