Questão jurídica principal
Whether the annual contribution under LVIT art. 18 has a sufficient legal basis and is proportionate, and whether it violates federal supremacy.
Decisão extraída
The contribution is a preferential charge with a sufficient legal basis; it is not disproportionate and does not violate federal supremacy because federal viticulture law allows cantons to adopt measures protecting vine cultivation.
Fundamentação extraída
The cantonal levy pursues viticulture protection, which is compatible with the federal wine statute's reservation of cantonal protective measures. The charge therefore withstands review under legality, proportionality, and federal pre-emption.