| Variants | Average number of grape berry in the bunch | % | Average number of healthy grape berry in the bunch | % | Average number of disased grape berry in the bunch | % | Infection index according to formula of Mc-Kinney (%) | Efficiency of fungicide according to formula of Abott (%) | Allowed a level of significance of 5% (p < 0.05) |
| Smederevka (chemically treated) | 156 | 100 | 149 | 95.5 | 7 | 4.5 | 5 | 94.1 | 99.1 |
| Smederevka-control (untreated) | 149 | 100 | 30 | 20.1 | 119 | 79.9 | 84.2 | / | / |
| Zilavka (chemically treated) | 113 | 100 | 104 | 92 | 9 | 8 | 7.7 | 90.2 | 97.9 |
| Zilavka-control (untreated) | 121 | 100 | 18 | 14.9 | 103 | 85.1 | 78.3 | / | / |