Thrips on radishes

[Lycopersica]

In my indoor container garden, I grow radishes for the greens as well as the bulbs. I put them on my balcony during a cool weather streak and sometime later noticed a problem with thrips. (Thankfully, they aren't spreading to the tomato plants.) Any idea how to get rid of them? Safer insecticidal soap killed some of the thrips but burnt the leaves pretty badly too.