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Whiteflies love tomato plants, this should help http://www.ghorganics.com/whiteflies....
In the past I have used both Neem Oil and yellow sticky traps with some success. -
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My first question would be: are they white flies or aphids? But the quick-acting solution of an insecticidal soap like SAFER should work on both and be semi-benign environmentally. As always, read the label -- I think you're supposed to leave a day or two between spraying and picking, and of course wash your tomatoes well.
For the longer term, I'd plant things that bring in beneficials, or predatory insects - like alyssum, cosmos, marigold, basil (which is a great companion for tomatoes), I think cilantro if you like it.


