Insecticidal Effect and Residual Action of Fenitrothion and Esfenvalerate on Sitophilus oryzae and S. zeamais (Coleoptera: Curculionidae) in Stored Maize and Wheat

Table 1

Residual degrees of freedom, deviances and 𝑋² for the linear logistic model, estimates of α and β parameters, probability descriptive level for the effect of linear regression and lethal time 50 (LT₅₀).

Type of grain	DF.	Deviance		𝑋^2		Parameters		Linear regression (Pr > 𝜒^2)	LT50 (months)
		Value	Pr > 𝜒^2	Value	Pr > 𝜒^2	α	β
Esfenvalerate × S. oryzae
Maize	36	13.37	0.9998	16.37	0.9980	−3.351	−1.216	0.0056	—
Wheat	36	13.37	0.9998	16.37	0.9980	−4.749	−1.216	0.0056	—
Esfenvalerate × S. zeamais
Maize	39	34.73	0.6651	30.02	0.8486	−1.153	−0.359	<0.0001	—
Wheat	39	34.73	0.6651	30.02	0.8486	−1.313	−0.359	<0.0001	—
Fenitrothion × S. oryzae
Maize	72	61.20	0.8141	53.19	0.9528	4.101	−0.668	<0.0001	6.14
Wheat	72	61.20	0.8141	53.19	0.9528	7.581	−0.668	<0.0001	11.35
Fenitrothion × S. zeamais
Maize	75	13.83	1.0000	10.88	1.0000	27.382	−2.361	<0.0001	11.60
Wheat	75	13.83	1.0000	10.88	1.0000	32.511	−2.361	<0.0001	≥13.77
Fenitrothion + Esfenvalerate × S. oryzae
Maize	72	62.51	0.7802	51.08	0.9707	3.897	−0.632	<0.0001	6.17
Wheat	72	62.51	0.7802	51.08	0.9707	7.665	−0.632	<0.0001	12.14
Fenitrothion + Esfenvalerate × S. zeamais
Maize	75	5.93	1.0000	4.03	1.0000	31.083	−2.650	<0.0001	11.73
Wheat	75	5.93	1.0000	4.03	1.0000	35.950	−2.650	<0.0001	≥13.57