Laura in S. Spain: citrus leaves curling, trails, ants farming black aphids. Ants protect aphids for honeydew → sooty mold. Blast off with strong water spray. Sprays: tobacco tea, dormant oil, garlic/onion, lime water. Interplant: nasturtiums, chives repel both. Search "organic black citrus aphid control" for more.
No chemicals needed. Persistence wins.
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