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Ecological Processes

Table 5 Analysis of deviance, natural logarithms of odds ratio, and standard error of added variables in a reduced model analyzing septoria tritici blotch severity

From: Epidemiological factors of septoria tritici blotch (Zymoseptoria tritici) in durum wheat (Triticum turgidum) in the highlands of Wollo, Ethiopia

Added variable Residual deviance df Deviance reduction Pr > χ2 Variable class Estimate loge (odds ratio) SE Odds ratio
Intercept 1378.9      − 3.42 0.54 0.03
District 1022.9 4 356.02 < 0.0001 Jama 0.45 0.50 1.56
Wadila 0.69 0.19 0.50
Woreilu 1.19 0.38 3.30
Dessie Zuria − 1.64 0.50 0.19
Meket 0.00 0.00 1
Altitude 1016.81 1 6.10 0.0135 ≤ 2700 masl − 0.30 0.16 0.74
> 2700 masl 0.00 0.00 1
Variety 644.66 10 372.15 < .0001 Abesha 0.85 0.50 2.33
Enat 0.55 0.70 1.73
Enzosh 2.58 0.50 13.14
Firno 2.57 0.56 13.10
Gojam − 1.27 0.83 0.28
Gundile 0.40 0.45 1.50
Key 1.32 0.50 3.75
Laste 0.98 0.41 2.67
Nech 1.37 0.88 3.95
Nech jiru 0.00 0.27 1.00
Tikur jiru 0.00 0.00 1
Growth stage 628.48 3 16.18 0.001 Early flowering − 0.30 0.21 0.74
Flower 0.69 0.51 1.99
Late milk 0.86 0.42 2.37
Milk 0.00 0.00 1.00
Plant population 463.07 2 165.41 < .0001 High (> 210 plants m2) 0.32 0.16 1.38
Low (< 140 plants m2) − 0.80 0.23 0.45
Medium (141–210) 0.00 0.00 1.00
Planting date 447.58 4 15.49 0.0038 August 0.13 0.21 1.14
Early July − 0.29 0.21 0.75
June 0.81 0.23 2.24
Late July − 0.64 0.26 0.53
Mid-July 0.00 0.00 1.00
Previous crop 266.30 3 181.28 < .0001 Barley − 3.07 0.34 0.05
Legume − 1.55 0.20 0.21
Tef − 0.82 0.23 0.44
Wheat 0.00 0.00 1.00
Weed population 234.24 2 32.06 < .0001 High (> 61 weeds m2) 0.50 0.17 1.65
Low (< 40 weeds m−2) 0.91 0.18 2.48
Medium (41–60 weeds m−2) 0.00 0.00 1.00
Soil type 222.7967 2 11.45 0.0033 Red 0.30 0.24 1.34
Gray 0.52 0.17 1.69
Black 0.00 0.00 1.00
  1. df degrees of freedom, Pr probability of a χ2 value exceeding the deviance reduction, SE standard error
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