Spraying your tomato plants for thrips does little good since an infected thrip can land on the vine, pierce the leaf tissue, and deposit infected saliva on the spot before taking up enough poison to kill the insect. So even by the time the thrip dies of ingested or contacted pesticide, it may already have vectored the disease to the plant tissue. You would have to stand in the garden and spray them as they flew in swarm by swarm to do much good if all you're doing is concentrating on the ones attacking the tomato vines.
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