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Aphids on seedlings

I am raising some Geums from seed - they are currently about 3" tall and are in 3" pots on a windowsill. Somehow they have got greenfly. I pick the greenfly off every day and squash them, but they come back very fast. Is there anything else I can do? It's very hard getting at the tiny insects without crushing the fragile stems.
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Can you not spray them with insecticide?