Susceptibility Evaluation of Fall Armyworm (Spodoptera frugiperda) Infesting Maize in Kenya against a Range of Insecticides

Table 5

Susceptibility of field populations of Spodoptera frugiperda to spinosad, spinetoram, and lufenuron.

Region	Insecticides		N	Slope ± SE	χ ^2 (df)	LC50 (mg/L)	95% FL (mg/L)	RR
Western	Spinosad	SUS	200	1.93 ± 0.28	0.1 (3)	0.26	0.19–0.34	1
		KK	200	1.47 ± 0.26	0.48 (3)	0.4	0.26–0.56	1.54
		VH	200	1.22 ± 0.24	1.84 (3)	0.39	0.23–0.58	1.5
		BS	200	1.53 ± 0.25	2.41 (3)	0.39	0.27–0.53	1.5
		BN	200	1.37 ± 0.25	2.47 (3)	0.39	0.24–0.56	1.5
Central		MR	200	1.47 ± 0.25	2.47 (3)	0.45	0.31–0.63	1.73
		KA	200	1.65 ± 0.27	0.25 (3)	0.43	0.29–0.58	1.65
Eastern		EB	200	1.22 ± 0.25	1.45 (3)	0.44	0.26–0.67	1.69
		TN	200	1.56 ± 0.26	0.76 (3)	0.44	0.30–0.62	1.69
Nyanza		KS	200	1.66 ± 0.27	2.99 (3)	0.37	0.25–0.51	1.42
		SA	200	1.50 ± 0.26	1.27 (3)	0.36	0.24–0.50	1.38
Rift valley		UG	200	1.51 ± 0.26	1.84 (3)	0.63	0.44–0.90	2.42
		TZ	200	1.28 ± 0.25	0.7 (3)	0.76	0.52–1.19	2.92
		NN	200	1.25 ± 0.24	0.75 (3)	0.61	0.41–0.93	2.35
Western	Spinetoram	SUS	200	1.86 ± 0.28	0.85 (3)	0.14	0.10–0.19	1
		KK	200	1.64 ± 0.26	1.20 (3)	0.18	0.12–0.24	1.29
		VH	200	1.64 ± 0.27	1.86 (3)	0.16	0.11–0.22	1.14
		BS	200	1.69 ± 0.26	0.95 (3)	0.19	0.14–0.25	1.36
		BN	200	1.63 ± 0.27	2.13 (3)	0.16	0.11–0.23	1.14
Central		MR	200	0.92 ± 0.23	1.33 (3)	0.27	0.16–0.48	1.93
		KA	200	1.19 ± 0.24	1.93 (3)	0.28	0.18–0.44	2
Eastern		EB	200	1.42 ± 0.27	0.13 (3)	0.25	0.16–0.37	1.79
		TN	200	1.41 ± 0.26	2.08 (3)	0.22	0.14–0.32	1.57
Nyanza		KS	200	1.85 ± 0.27	1.35 (3)	0.16	0.11–0.21	1.14
		SA	200	1.82 ± 0.29	0.72 (3)	0.16	0.11–0.22	1.14
Rift valley		UG	200	1.35 ± 0.28	0.07 (3)	0.35	0.22–0.55	2.5
		TZ	200	1.30 ± 0.25	2.09 (3)	0.48	0.33–0.80	3.43
		NN	200	2.03 ± 0.30	0.97 (3)	0.3	0.23–0.40	2.14
Western	Lufenuron	SUS	200	2.30 ± 0.43	0.50 (3)	2.82	1.87–3.59	1
		KK	200	3.00 ± 0.58	1.83 (3)	4.4	3.22–5.36	1.56
		VH	200	2.64 ± 0.47	0.64 (3)	4.32	3.29–5.25	1.53
		BS	200	2.34 ± 0.45	0.21 (3)	4.42	3.30–5.46	1.57
		BN	200	2.68 ± 0.46	0.83 (3)	4.45	3.46–5.36	1.58
Central		MR	200	2.55 ± 0.50	1.45 (3)	4.91	3.72–6.02	1.74
		KA	200	2.93 ± 0.58	1.01 (3)	4.88	3.65–5.92	1.73
Eastern		EB	200	3.21 ± 0.61	1.03 (3)	4.62	3.46–5.56	1.64
		TN	200	3.15 ± 0.49	2.49 (3)	4.62	3.77–5.41	1.64
Nyanza		KS	200	3.24 ± 0.56	0.69 (3)	4.25	3.26–5.09	1.51
		SA	200	2.78 ± 0.45	1.91 (3)	4.23	3.34–5.04	1.5
Rift valley		UG	200	2.51 ± 0.51	0.40 (3)	6.13	4.86–7.62	2.17
		TZ	200	2.37 ± 0.47	1.55 (3)	5.76	4.58–7.13	2.04
		NN	200	2.51 ± 0.51	2.67 (3)	5.05	3.80–6.22	1.79