Congrats to Francisco! He is now a licensed private applicator for pesticides. Looking for someone to employ to take care of your vineyards and/or wine? Look no further. Awesome career development and good for personal safety. He can now apply pesticides and teach others about the safety precautions to take when working with pesticides.
There are many strategies for pest management in the vineyards. At some point to protect the grapes though, vineyard owners (even the organically farmed ones) often choose to spray. For example, they might spray a sulfur solution to prevent molds/powdery mildew after summer rains.