Spray grapevines despite being organic?

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Valued GARDENA gardening expert! My grapevines have multiplied over the last 10 years to almost 40 plants. I have never had any problems due to insects or rotting. But even with the best hanging, there is over a 50% loss and it continues because they have not yet matured. I have never sprayed them. Should I have done this in spite of being organic? What is your experience? I would be grateful for any advice so that I may continue in the next years to distribute grapes to our large family (over 30 people).

The GARDENA gardening expert

This really has not been a grape year for us, Mr. R. I have the same problem. Even my fungus-proof vines have numerous rotting grapes in the clusters. In the middle of July, I sprayed them with a copper preparation against mildew and saved them from a massive spreading of fungus. But I had the impression that it was already too late and numerous grapes were already damaged. I believe that the damage on the grape skin benefited the rotting. Even when grapes burst – a feast for flies and wasps. The bursting can be explained by mildew infestation and irregular watering of the vines: first, there was intermittent drought then ample rainfall. On the whole, the rain and moisture brought even the fungus-proof table grape varieties to their knees. Although, we must remember that fungus-proof only means “fungus tolerant” and not “fungus resistant”. The latter are guaranteed not to be infested, the former, “maybe not”.
My conclusion and at the same time, advice: I am going to treat my grapevines in the next May/June and a second time later with an environmentally-friendly fungicide (Net-Sulphur WG, Atempo Copper-FungusFree, both from Neudorff). This means for later: Depending on the maturation period of the variety, around the end of July/beginning of August because a waiting period of 35 days applies after spraying.