One of my plants recovered from thrips but the main infected girl kept getting worse and I had to chop her. I sprayed all of them during veg and after I haven't had any issues with them. I would say do treatment and monitor. If it can't be controlled then to the chopping block she goes.
My buddy at the hydro store gave me this but I know Neem oil works well. I took them to the bathtub and sprayed down every 3 days for 2 weeks when the light cycle was dark (oil will burn the leaves with intense light). I just vegged an extra 2 weeks after.
One of my plants recovered from thrips but the main infected girl kept getting worse and I had to chop her. I sprayed all of them during veg and after I haven't had any issues with them. I would say do treatment and monitor. If it can't be controlled then to the chopping block she goes.