Fox Farm's "Don't Bug Me"

So I have pretty bad Thrips in a newer crop.

I bought this Fox Farm pyrethren based stuff that my hydro shop was pushing. Seems to kill them alright...as well as turn the plants a nasty brown.

I hit them twice a week with a quick mist for the past couple of weeks and it looks like the pests are pretty much done, but I'm wondering if my plants are adversely affected by the shit, or if it's the Thrips causing the browning???? Seems to brown up a lot of the lower old growth a day or two after I hit it with the Fox Farm.

Anyone else experience this? Is this shit too strong?
 
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