• ants farm aphids - they don't eat them, they encourage them.
    ladybirds (grubs and beetles) and hoverfly (grubs only I think) eat them.
    discourage the ants and you should have fewer aphids too.

    sorry no advice on the rose.

  • you might have been allowing the ants thinking they control the aphids, it's the opposite so get rid of the ants if you want rid of the aphids. you can also buy ladybird larvae from the same places as nematodes (I didn't know you could get nematodes for ants?)

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