At time of writing, I've done two sprays two weeks apart. First was on Sunday 26th of May and the second on Monday 10th of June.
Designed to combat the powdery and downy mildew I had last year as well as maybe other diseases, I'm using a mix of 10g wettable sulphur and 100g of Bordeaux Mixture in 5l of water. This is applied using a backpack sprayer. This amount seems to be plenty to coat all the leaves for now, it may have to be upped later once there's more foliage to spray.
Photo from just before bud burst, so about 2-3 weeks before the first spray:
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