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Oh, a mystery quiz.
Guess the problem without being told what plant it is.
I'd guess at an apple leaf, with a rosy-leaf-curling aphid (Dysaphis devecta) crawling across it.
Treatment:
Not required if the plant is growing well. The plants vigour, its defences and predators will usually deal with them (ladybird larvae, lacewing larvae, hoverfly larvae).
Water jet or soapy water if the plant is struggling.
Why waste water when a thumb and finger works just as well
In fairness, Chris, apple leaves infested and curled by aphids tend to get quite brittle and break up if manhandled, so a spray of water or soapy water means less risk of breaking the leaves and further weakening a struggling plant.
Leaves which have been badly curled by aphids often get dropped by the plant in due course if the plant is adequately vigorous, and it grows multiple new shoots - often a shoot from every leaf which dropped. Kind of over-compensating for aphid damage by a huge burst of shoot growth. Sometimes aphid attacks on shoot tips can be handy to encourage branching along that shoot.
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