Resistance

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Resistance of a living organism to damage, especially from infections and poisoning, but also environmental conditions. In German, the term "Widerstandsfähigkeit" should be used instead of "Resistenz", which is the correct term, because in German, "Resistenz" means complete resistance. In contrast, "immunity" means a complete defence mechanism or insensitivity. In English, "resistance" does not mean 100% resilience. The term tolerance is often used in this context instead.

Relevance in viticulture

In viticulture, the resistance of grape varieties is very important (depending on location and climate). These are above all fungi, frost, phylloxera and drought or drought and water stress. Plants often develop a natural resistance to their enemies over very long periods of time, up to several million years. A good example is the resistance of certain American grape varieties to phylloxera, which is developed in several stages, or to both types of mildew. The picture shows the difference between a non-resistant and a resistant vine when a phylloxera attacks the leaf. On the left is a pouch-like gall with phylloxera inside and eggs laid by it, and on the right is a weak reaction without gall formation. In extremely resistant vines, there is no reaction at all when bitten.

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Roman Horvath MW
Domäne Wachau (Wachau)

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Resistance

Relevance in viticulture

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