Tiny caterpillars gobbling up my rose 🌹 🐛

Hi,
Noticed my iceberg rose’s leaves are being slowly obliterated with just the stem remaining. Looked closer and discovered these tiny caterpillars, what are they and what can I do?

Thank you!
Noticed my iceberg rose’s leaves are being slowly obliterated with just the stem remaining. Looked closer and discovered these tiny caterpillars, what are they and what can I do?

Thank you!
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.