Table 5.

Logistic regression models analysis of FBG incidence and severity, LRTs for independent variables when entered first and last into the model

Independent variable	df	Incidence LRT				Severity (PSI) LRT
		VEF		VEL		VEF		VEL
		DR	Pr > χ2	DR	Pr > χ2	DR	Pr > χ2	DR	Pr > χ2
Year	1	13.3	0.0003	13.3	0.0003	8.3	0.0039	8.3	0.0039
Region	2	182.3	<0.0001	197.9	<0.0001	15.3	0.0005	22.3	<0.0001
Zone	8	285.6	<0.0001	106.7	<0.0001	100.4	<0.0001	86.2	<0.0001
Crop growth stage	4	41.2	<0.0001	15.8	0.0033	37.4	<0.0001	40.4	<0.0001
Crop density	2	12.0	0.0025	3.9	0.1442	22.8	<0.0001	18.2	0.0001
Cropping System	1	22.0	<0.0001	17.1	<0.0001	8.3	0.0041	9.0	0.0026
Slope of field	2	2.3	0.3106	0.3	0.8584	20.9	<0.0001	13.1	0.0015
Cropping pattern	1	26.4	<0.0001	0.4	0.5391	9.2	0.0025	7.9	0.0049
Altitude	2	200.9	<0.0001	109.1	<0.0001	96.5	<0.0001	84.1	<0.0001
Weed density	1	72.0	<0.0001	26.4	<0.0001	15.3	<0.0001	13.3	0.0003
Soil type	2	4.7	0.0951	32.6	<0.0001	1.4	0.4883	10.0	0.0066
Fertilizer application	2	41.9	<0.0001	0.5	0.7813	51.7	<0.0001	5.6	0.0618
Drainage method	1	2.0	0.1597	3.6	0.0577	1.9	0.1689	0.5	0.459
Crop nearby	2	33.0	<0.0001	3.5	0.1697	4.8	0.0903	0.3	0.8803
Fungicide	1	93.7	<0.0001	43.0	<0.0001	214.8	<0.0001	101.6	<0.0001

FBG, faba bean gall; df, degrees of freedom; LRT, likelihood ratio test; PSI, Percent Severity Index; VEF, variable entered first; VEL, variable entered last; DR, deviance reduction; Pr, probability of a χ² value exceeding the deviance reduction.