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Apparently traditional fungicidal lime and sulphur is no longer available to backyard gardeners in the US (but one can buy Roundup glyphosate no problem). Sigh...
So far I only have it on one tree. I used Captain Jack's Ready-to-Use Liquid Copper Fungicide. Approved for organic gardening, last winter. It seemed to reduce the amount of curl but didn't get rid of it.
Obviously Lime and Sulphur spray is dangerous....to the chemical industry 🤣
I don't think we can ever get rid of leaf curl. It lives in the leaf buds themselves, that's why you need to spray at budburst and leaf fall. I dont think the spray ever really gets that far into the buds
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