Trebbiano di Lugana, along with Trebbiano di Soave, have been considered biotypes of Verdicchio.

However, for precision’s sake, Trebbiano di Lugana is genetically different from Trebbiano di Soave and Verdicchio (admittedly, by a very small amount) but neither Trebbiano di Lugana nor Trebbiano di Soave taste anything like Verdicchio. (After all, they have had centuries to adapt to a wholly different region.)

It is best to view these three grapes as different. In fact, in order to avoid confusion, the official name of Trebbiano di Lugana is now Turbiana. The clones that are most often used are R2 (for table wine production), CSV (for late harvest and sparkling wine production), ERPT 155 and CVP 01-162 (for quality production with good aging potential).