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Help little flies everywhere

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as soon as I put young plants in the greenhouse within a day swarms with small white flies pounce on my plants and suck the life out of them. how can I prevent this and where do they come from. I have no idea if it really flies. They are very similarlooking like flies
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Sounds like whitefly Ellen. I'm seeing loads around the compost heap this year, think it will be a bad year for them.
Write up here:
https://www.rhs.org.uk/advice/profile?PID=193
Seems to recommend biological control with parasitic wasps, anyone tried that with success??
I agree - yellow sticky traps are a great way of catching them.