Black Orchid - I normally just do a foliar spray with a systemic fungicde, it would not hurt to do a drench of the whole plant, pot and all but in my opinion it is over kill and not nescessary. If it were an insect issue, sure I would suggest that you drench the plant but a fungal infection starts out topically and eventually makes its way into the circulatory system so you would need a fungicide that will do the same, which is what a systemic fungicide does, it is absorbed both by the plant and its roots into the circulatory system.
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