What are these white things in my greenhouse?

[Nat1H]

I was watering today and thought I had better check my peppers for bugs. I found loads of aphids but realised that everything - tomatoes, chillies, peppers, carrots (not lettuce I don't think) had these minute white things on them and on the soil underneath. they look like minute grains of rice (a bit like dandruff actually). What are they and how do I get rid? Don't really want to use pesticides - would rather use a biological control.
Please help! Has taken me so long to grow everything from seed!

are they whitefly? very common on greenhouse crops and especially tomatoes.

marigolds are good for repelling them, so get some french marigold bedding plants from the garden centre and grow them alongside.

also mint and basil can help deter or act as sacrificial plants.

Get a cheap spray bottle and put water and a sqirt of washing up liquid in. Squirt liberally tops and bottoms of leaves and this controls whitefly really well, also aphids if you sqirt them really hard. Both knocks them off and mucks up their respiratory systems.

Not sure if this is organic really, suppose the surfactant is a chemical. But it's pretty mild.

Also whitefly more common on stressed plants. Are you feeding yours? I always get them on basil but my basil is never very happy.