Answer
Preventively, before infection periods — at bud break, after leaf fall and during wet spells; not on open blossom or in hot sun (phytotoxic).
Detailed question
When should it be sprayed?
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RXSOL CHEMO PHARMA International Navi Mumbai, India
Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
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Preventively, before infection periods — at bud break, after leaf fall and during wet spells; not on open blossom or in hot sun (phytotoxic).
When should it be sprayed?