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Ecological Processes

Table 3 Independent variables used in logistic regression modeling durum wheat incidence and severity and likelihood ratio test (LRT) for nine variables as single predictors of disease outcome

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

Independent variable df Septoria tritici blotch incidence LRT > 50% Septoria tritici blotch severity LRT > 25%
DR Pr > χ2 DR Pr > χ2
District 4 534.21 < .0001 356.02 < .0001
Altitude 1 128.55 < .0001 6.10 0.0135
Variety 10 931.59 < .0001 372.15 < .0001
Growth stage 3 53.77 < .0001 16.18 0.001
Plant population 2 474.36 < .0001 165.41 < .0001
Planting date 4 33.04 < .0001 15.49 0.0038
Previous crop 3 222.05 < .0001 181.28 < .0001
Weed population 2 13.88 0.001 32.06 < .0001
Soil type 2 59.69 < .0001 11.45 0.0033
  1. df degrees of freedom, DR deviance reduction, Pr probability of a χ2 value exceeding the deviance reduction
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