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Table 1

Caftaric acid (CA) and coutaric acid (CO) percentage incidence over total HCTA in healthy and FD-infected leaves (2015), veins and blades (2016). S = level of Significance by the Duncan’s test at * = P < 0.05, ** = P < 0.01, between sanitary state (in columns) and varieties (in rows).

  Barbera Nebbiolo S
CA CO CA CO CA CO
2015
Healthy 82. 16. 87.7 11. ** ns
leaves 7 4   8    
FD-inf 83. 15. 88.8 10. ** ns
leaves 8 5   8    
S ns ns ns ns    
2016
Healthy 83. 12. 89.2 7.3 ** **
veins 9 3        
Healthy 82. 11. 89.1 6.0 ** **
blades 5 4        
FD veins 85. 11. 85.6 7.8 ns *
  3 4        
FD blades 81. 13. 86.3 8.0 * **
  0 9        
S veins ns ns * ns    
S blades ns ns * ns    

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