Article Figures & Data
Figures
- Figure 1.
Correlation between leaf calcium content (leaves collected in early May ca. 6 weeks after leaf flush) and scab severity at the cessation of the growing season. Intercept (calculated) = −0.0403; Coefficient = −1.50; r2 (% variation accounted for) = 0.04; P value = 0.179. ▴ = M. × purpurea ‘Eleyi’; ▪ = M. ‘Red Jade’; • = M. huphensis; × = M. ‘Cox’s Orange Pippin’ ♦ = M. ‘Golden Delicious’.
Tables
- Table 1.
Selected calcium foliar sprays compared for the control of apple scab (Venturia inaequalis) on apple cv. Crown Gold as measured by leaf and fruit scab severity, chlorophyll fluorescence (Fv/Fm values), leaf chlorophyll content (SPAD values), and leaf Ca content. Data from 2006.
Treatment Leaf scab severityz Fruit scab severityz Fv/Fmy SPADy Leaf Ca contentz Control 3.50 2.85 0.723 12.26 1.22 Silwett 3.62ns 2.50ns 0.713ns 15.69ns 1.24ns Calcium chloride 2.13* 1.38* 0.813* 19.12* 1.47* Calcium sulfate 2.50* 2.75ns 0.803* 18.34* 1.39* Calcium nitrate 3.00ns 1.75* 0.797ns 14.3 ns 1.51* Calcium nitrate borate 2.50* 2.13* 0.800ns 13.05ns 1.46* Calcium hydroxide 2.13* 1.50* 0.799ns 18.70* 1.58* Calcium metalosate 2.75ns 2.13* 0.723ns 12.80ns 1.37* Calcium amino acid complex 2.38* 2.25ns 0.793ns 18.75* 1.59* Penconazole 1.70* 1.00* 0.811* 20.51* 1.24ns DF 79 79 79 79 79 LSD 0.826 0.678 0.082 3.86 0.134 Significance of Ca (P value) 0.002 <0.001 0.059 <0.001 <0.001 - Table 2.
Selected calcium foliar sprays compared for the control of apple scab (Venturia inaequalis) on apple cv. Crown Gold as measured by leaf and fruit scab severity, chlorophyll fluorescence (Fv/Fm values), leaf chlorophyll content (SPAD values), and leaf Ca content. Data from 2007.
Treatment Leaf necrosisz Fruit necrosisz Fv/Fmy SPADy Leaf Ca contentz Control 4.00 3.00 0.715 11.69 1.21 Silwett 3.88ns 2.88ns 0.702ns 13.85ns 1.24ns Calcium chloride 1.63* 1.25* 0.807* 19.00* 1.45* Calcium sulfate 2.25* 3.12ns 0.780ns 16.45* 1.36* Calcium nitrate 2.62* 2.25* 0.783ns 15.76* 1.50* Calcium nitrate borate 2.25* 2.50ns 0.788ns 14.79* 1.43* Calcium hydroxide 1.88* 1.88* 0.791ns 18.00* 1.51* Calcium metalosate 2.25* 2.38* 0.785ns 12.69ns 1.39* Calcium amino acid complex 2.13* 2.50ns 0.779ns 16.18* 1.57* Penconazole 1.45* 1.00* 0.805* 21.30* 1.26ns DF 79 79 79 79 79 LSD 0.722 0.556 0.091 2.708 0.146 Significance of Ca (P value) <0.001 <0.001 0.004 <0.001 <0.001
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