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

Table 4

Susceptibility of field populations of Spodoptera frugiperda to pyridaben, abamectin, and imidacloprid.

Region	Insecticides		N	Slope ± SE	χ ^2 (df)	LC50 (mg/L)	95% FL (mg/L)	RR
Western	Pyridaben	SUS	200	4.16 ± 0.68	0.93 (3)	4.96	4.02–5.70	1
		KK	200	4.25 ± 0.67	0.69 (3)	5.6	4.68–6.35	1.13
		VH	200	3.56 ± 0.63	2.29 (3)	5.32	4.23–6.18	1.07
		BS	200	4.01 ± 0.63	0.25 (3)	5.95	5.05–6.72	1.2
		BN	200	4.02 ± 0.65	2.09 (3)	5.71	4.74–6.49	1.15
Central		MR	200	3.66 ± 0.62	0.12 (3)	6.47	5.48–7.36	1.3
		KA	200	4.10 ± 0.64	0.71 (3)	6.44	5.55–7.24	1.3
Eastern		EB	200	4.21 ± 0.69	1.37 (3)	6.16	5.19–6.98	1.24
		TN	200	4.49 ± 0.72	0.97 (3)	6.17	5.22–6.95	1.24
Nyanza		KS	200	4.71 ± 0.72	2.49 (3)	5.57	4.69–6.28	1.12
		SA	200	4.20 ± 0.69	1.81 (3)	5.33	4.35–6.11	1.07
Rift valley		UG	200	3.76 ± 0.63	0.49 (3)	6.82	5.86–7.72	1.38
		TZ	200	4.06 ± 0.73	0.04 (3)	6.96	5.81–7.95	1.4
		NN	200	4.13 ± 0.65	0.58 (3)	6.75	5.85–7.57	1.36
Western	Abamectin	SUS	200	2.94 ± 0.48	0.74 (3)	3089.31	2269.00–3782.95	1
		KK	200	2.76 ± 0.51	1.43 (3)	4246.42	3134.31–5198.31	1.37
		VH	200	2.96 ± 0.46	0.09 (3)	4168.13	3356.92–4916.31	1.35
		BS	200	2.64 ± 0.47	0.64 (3)	4319.99	3292.52–5244.81	1.4
		BN	200	2.69 ± 0.44	1.08 (3)	4325.42	3444.55–5155.33	1.4
Central		MR	200	2.75 ± 0.46	0.08 (3)	4767.97	3850.98–5667.42	1.54
		KA	200	2.44 ± 0.45	0.68 (3)	4581.29	3493.61–5612.33	1.48
Eastern		EB	200	2.91 ± 0.51	0.2 (3)	4396.5	3352.09–5310.22	1.42
		TN	200	2.93 ± 0.51	1.52 (3)	4350.45	3340.59–5229.24	1.41
Nyanza		KS	200	2.88 ± 0.45	0.24 (3)	4201.76	3372.33–4969.76	1.36
		SA	200	2.75 ± 0.45	2.43 (3)	4100.59	3230.84–4894.78	1.33
Rift valley		UG	200	2.49 ± 0.49	0.73 (3)	5105.51	3910.34–6270.82	1.65
		TZ	200	2.58 ± 0.46	0.17 (3)	5359.01	4346.40–6453.85	1.73
		NN	200	2.99 ± 0.55	0.86 (3)	5040.48	3930.81–6043.45	1.63
Western	Imidacloprid	SUS	200	4.11 ± 0.69	0.18 (3)	955.68	761.82–1103.07	1
		KK	200	3.94 ± 0.68	0.36 (3)	1397.14	1188.75–1587.29	1.46
		VH	200	3.49 ± 0.61	1.94 (3)	1288.41	1082.51–1470.58	1.35
		BS	200	3.6 ± 0.68	0.37 (3)	1476.64	1241.16–1701.55	1.55
		BN	200	3.00 ± 0.60	0.27 (3)	1427.66	1187.70–1667.36	1.49
Central		MR	200	3.91 ± 0.81	0.51 (3)	1654.45	1388.68–1916.66	1.73
		KA	200	4.13 ± 0.79	0.61 (3)	1684.33	1447.96–1933.26	1.76
Eastern		EB	200	3.91 ± 0.77	1.65 (3)	1544.96	1296.75–1772.16	1.61
		TN	200	3.36 ± 0.72	0.63 (3)	1565.02	1276.63–1847.47	1.64
Nyanza		KS	200	4.16 ± 0.67	0.28 (3)	1230.25	1038.0–1392.80	1.29
		SA	200	4.14 ± 0.70	0.10 (3)	1168.39	960.90–1336.15	1.22
Rift valley		UG	200	3.55 ± 0.70	1.60 (3)	1726.1	1481.32–2026.78	1.81
		TZ	200	4.04 ± 0.86	0.21 (3)	1748.02	1480.99–2027.77	1.83
		NN	200	3.64 ± 0.79	0.79 (3)	1696.73	1411.02–1996.02	1.78