I've taken over an old greenhouse in which plants and fruit had been left to rot. I cleaned it inside and out with milton and washing up liquid and it looked great. Unfortunately though when I left a couple of plants in it some of them have developed a kind of fungus, (black spots which are spreading rapidly) I read somewhere that I can get a fumigating candle but can't find one. Is this a good idea and if so, where could I find one?
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