Thrips are tough customers. It's hard to beat them back, and they come in waves. Unfortunately, you only notice their presence once they've done their damage.
Create a "trap" area with mostly yellow flowers, douse 'em with the chemical of your choice.
Study the life cycle of thrips and find your targets.
Be diligent about the days you spray, keep to the schedule.
Rotate, rotate, rotate the mechanism of death.
Buy TSWV resistant varieties (Granadero, Plum Regal are the ones I'm betting on this year)
Have backup plants in a segregated area of the garden.
And when all this fails, go to the mattresses like I have and buy these two:
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