Name (also jaundice, pallor) for a vine disease that is manifested by yellowing of the leaves. The cause is usually a lack of nutrients and sometimes also an excess of boron, iron, calcium, magnesium, manganese, sulphur, nitrogen or zinc, as well as too much salt in the soil. As a result, the chlorophyll (leaf green), which is responsible for the rich green colour of the leaves, is either not formed properly or even degraded. As a result, the plant can no longer carry out photosynthesis, which can even lead to the death of the plant. Due to the degradation and the retention of the yellow pigments (carotenoids), the leaves turn a light yellow, whereby the leaf veins often remain dark green.
In the past, you needed a wealth of encyclopaedias and specialist literature to keep up to date in your vinophile professional life. Today, Wine lexicon from wein.plus is one of my best helpers and can rightly be called the "bible of wine knowledge".Prof. Dr. Walter Kutscher
Lehrgangsleiter Sommelierausbildung WIFI-Wien