"We choose fairly vigorous rootstocks which have good resistance to phylloxera and are drought tolerant ."

Due to the pest, phylloxera, the majority of European wine-producing vines now have to be grafted onto the roots of native American varieties. These rootstocks give the vine a resistance to the feeding of the pest, phylloxera, which was introduced to Europe in the 1800's from America.

At La Rosa we choose our rootstocks carefully by considering both the soil type and the climatic conditions. We use three different rootstocks all of which have excellent drought tolerance, are fairly vigorous and are tolerant to the feeding of phylloxera.  As it is prohibited to irrigate in the Douro Valley, except for the establishment of young vines, it is vital that the rootstock can withstand the long, hot summers with little or no rain. 

In areas where the soils are skeletal and extremely rocky, such as Dona Sara, we plant the rootstock 110R. In other vineyards, with poor soils but not so rocky, such as Val de Inferno, we use the rootstock 1103P. More recently, we have used the rootstock 196-17 in soils that are more humid and fertile and have found that it adapts well to our acidic, schist soils. 

By using a combination of these three different rootstocks, we are able to match the most appropriate rootstock to the differing soil types and climatic conditions and thereby produce vines that are well balanced with excellent fruit quality.

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