Great question. Perhaps letting water stand on it for too long can also cause bacterial rot, which the spray does not protect against. In anycase, its perfectly safe to spray leaves so long as they dry out within an hour or two. So maybe you can spray the plant and put a fan or blower of some kind on the plant to dry it out.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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