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

Table 3

Susceptibility of Spodoptera frugiperda field populations to lambda-cyhalothrin, deltamethrin, and indoxacarb.

Region	Insecticide		N	Slope ± SE	χ ^2 (df)	LC50 (mg/L)	95% FL (mg/L)	RR
Western	Lambda-cyhalothrin	SUS	200	2.06 ± 0.34	1.55 (3)	53.77	34.34–71.63	1
		KK	200	3.09 ± 0.77	0.68 (3)	143.37	104.41–170.45	2.67
		VH	200	3.53 ± 0.82	1.02 (3)	141.14	107.54–164.79	2.62
		BS	200	2.12 ± 0.41	0.68 (3)	147.45	113.38–187.44	2.74
		BN	200	2.07 ± 0.56	0.13 (3)	143.48	100.12–204.60	2.67
Central		MR	200	3.41 ± 0.78	0.81 (3)	165.77	133.51–195.41	3.08
		KA	200	3.72 ± 0.84	0.99 (3)	160	128.36–186.43	2.98
Eastern		EB	200	4.04 ± 0.80	1.31 (3)	153.73	126.04–177.29	2.86
		TN	200	3.92 ± 0.79	0.74 (3)	155.02	127.45–178.74	2.88
Nyanza		KS	200	4.45 ± 0.76	1.53 (3)	139.63	117.32–158.61	2.6
		SA	200	3.60 ± 0.89	1.67 (3)	140.62	102.98–165.58	2.62
Rift valley		UG	200	3.78 ± 0.79	0.57 (3)	179.13	152.25–208.14	3.33
		TZ	200	3.29 ± 0.82	2.64 (3)	197.36	165.03–241.37	3.67
		NN	200	3.61 ± 0.72	0.20 (3)	162.26	134.88–188.64	3.02
Western	Deltamethrin	SUS	200	1.59 ± 0.27	0.34 (3)	29.46	18.25–40.92	1
		KK	200	1.41 ± 0.27	0.15 (3)	64.71	40.96–95.51	2.2
		VH	200	1.46 ± 0.27	0.49 (3)	62.84	40.62–91.07	2.13
		BS	200	1.27 ± 0.26	2.25 (3)	66.31	40.83–101.65	2.25
		BN	200	1.99 ± 0.28	0.96 (3)	63.25	48.48–81.19	2.15
Central		MR	200	1.12 ± 0.25	0.34 (3)	100.82	62.83–179.24	3.42
		KA	200	1.36 ± 0.27	1.55 (3)	97.83	64.08–154.50	3.32
Eastern		EB	200	1.33 ± 0.26	0.35 (3)	73.34	47.39–110.38	2.49
		TN	200	1.11 ± 0.23	1.29 (3)	73.17	47.09–115.73	2.48
Nyanza		KS	200	1.50 ± 0.25	0.19 (3)	61.78	43.44–85.34	2.1
		SA	200	1.51 ± 0.27	1.03 (3)	61.27	40.19–87.49	2.08
Rift valley		UG	200	1.04 ± 0.27	0.23 (3)	122.95	69.82–264.10	4.17
		TZ	200	1.16 ± 0.26	0.30 (3)	130.6	82.17–248.80	4.43
		NN	200	1.46 ± 0.28	0.70 (3)	119.21	81.95–186.57	4.05
Western	Indoxacarb	SUS	200	1.95 ± 0.35	1.74 (3)	10.85	6.66–14.68	1
		KK	200	1.91 ± 0.37	2.06 (3)	16.03	10.72–21.05	1.48
		VH	200	1.86 ± 0.33	2.72 (3)	15.49	10.90–20.02	1.43
		BS	200	2.24 ± 0.45	1.58 (3)	16.47	10.66–21.41	1.52
		BN	200	1.81 ± 0.33	1.47 (3)	16.3	11.55–21.15	1.5
Central		MR	200	1.95 ± 0.37	0.51 (3)	21.92	16.31–28.21	2.02
		KA	200	1.98 ± 0.40	0.23 (3)	20.24	14.24–26.25	1.87
Eastern		EB	200	2.44 ± 0.52	0.73 (2)	18.66	12.33–23.74	1.72
		TN	200	1.92 ± 0.40	2.54 (3)	18.81	12.59–24.72	1.73
Nyanza		KS	200	1.62 ± 0.32	0.21 (3)	14.96	9.56–20.31	1.38
		SA	200	1.47 ± 0.32	1.05 (3)	14.21	8.47–19.84	1.31
Rift valley		UG	200	1.78 ± 0.40	0.13 (3)	25.94	18.54–35.57	2.39
		TZ	200	1.77 ± 0.39	2.53 (3)	26.28	19.04–35.81	2.42
		NN	200	1.71 ± 0.35	1.97 (3)	22.33	16.06–29.93	2.06