Table 1 Mean disease severity (percentages of affected leaf area) and mean disease incidence (percentage of affected leaves) of ‘Chardonnay’ (CH) and ‘Nebbiolo’ (NE) artificially inoculated with Plasmopara viticola and Erysiphe necator at the end of trial 1. NE_CTR, CH_CTR: virus-free plants; NE_GRSPaV, CH_GRSPaV: GRSPaV-infected plants; NE_GFLV, CH_GFLV: GFLV-infected plants. Statistical significance values for the factors ‘genotype’, ‘virus’ and their interaction (genotype X virus) for disease severity and disease incidence are reported

From: Biological and molecular interplay between two viruses and powdery and downy mildews in two grapevine cultivars

  

Plasmopara viticola

Erysiphe necator

Source of variance

 

Disease severity %

Disease incidence %

Disease severity %

Disease incidence %

Genotype

CH

9.17 ± 3.74 ba

59.94 ± 15.62 b

3.72 ± 2.67 a

44.86 ± 18.23 a

 

NE

4.83 ± 4.85 a

38.31 ± 17.69 a

6.36 ± 4.05 b

62.39 ± 15.67 b

 

p value

<0.001

<0.001

0.042

0.019

Virus

CTR

10.96 ± 1.69 c

50.34 ± 7.92 b

7.28 ± 1.3 b

58.31 ± 13.96 a

 

GRSPaV

6.06 ± 0.99 b

52.62 ± 4.70 b

4.87 ± 4.86 ab

58.47 ± 22.00 a

 

GFLV

3.45 ± 1.09 a

35.56 ± 9.12 a

2.70 ± 0.7 a

42.04 ± 16.53 a

 

p value

<0.001

0.015

0.030

0.157

Genotype*Virus

CH_CTR

13.11 ± 0.91 c

65.04 ± 10.83 b

5.56 ± 1.39 ab

50.10 ± 6.76 ab

 

CH_GRSPaV

7.38 ± 1.53 a-c

60.96 ± 6.12 b

3.60 ± 1.06 ab

48.26 ± 8.28 ab

 

CH_GFLV

6.27 ± 0.42 a-c

56.84 ± 6.96 b

1.50 ± 0.84 a

32.22 ± 13.48 a

 

NE_CTR

7.87 ± 2.59 bc

38.57 ± 8.80 ab

9.00 ± 1.88 b

66.53 ± 4.81 ab

 

NE_GRSPaV

5.00 ± 1.22 ab

45.94 ± 5.65 ab

6.42 ± 2.46 ab

71.23 ± 10.52 b

 

NE_GFLV

0.63 ± 0.32 a

14.29 ± 6.18 a

3.62 ± 0.81 a

49.43 ± 1.84 ab

 

p value

0.047

0.001

0.041

0.052

  1. aLowercase letters denote significant differences attested by Tukey’s honestly significant difference (HSD) test (p ≤ 0.05). Standard errors are indicated
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