Study of Dominance Degree of Phylloxera Tolerance and Heterosis Effect in Fı Hybrids of Grapes

The aim of investigation was to evaluate dominance degree of tolerance to phylloxera and heterosis effect in hybrids of Fı generation, obtained from crossing interspecific hybrids resistant to phylloxera and root decay causing microorganisms (2 score) with Eurasian grape varieties (V.vinifera L.) with different tolerance degree to pests.