Final answer:
Copper and sulfur-based fungicides are the main products used for fungal control in organic vineyards.
Step-by-step explanation:
The main products used for fungal control in organic vineyards are copper and sulfur-based fungicides. These mineral-based pesticides are allowed in organic farming but must be used with caution. Copper-based materials must be used in a manner that minimizes accumulation in the soil, and certifiers may require soil testing to ensure copper is not accumulating. Copper and sulfur-based fungicides help control fungal diseases in an organic and environmentally friendly way.