ack just cut plant

heyas everyone i just cut my qleaner today and it has a small thrip problem. it wasnt there 10 days ago when i cut the top off, and was wondering if i put the plant outside for the night will the cold temperature kill them or make them leave? does anyone have any other suggestions. i also have 3 plants left in same grow room that have 3 weeks to go, is it safe to spray DR. DOOM in there for a week straight to make sure there are no problems, im sure theres some in there even though i dont see them.
 
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