How close to harvest can I use pyrethren based sprays?

Title says it all.

Got some Thrips wrecking havoc. Been knocking them down the best I can with Fox Farm's "Don't Bug Me" product. Planning harvest in 10 days. Should I stop now? Or can I get a little closer to actual harvest time? Does this stuff degrade quickly?

I started using this in my grow area between grows to be proactive.....eventually I got a white fly issue and sprayed some on the lower half's of some large plants in a tent and noticed some rusty spots appeared soon thereafter. I paid it no mind with all the bud activity up top. Thought maybe I went too hot with the nutes. Last week I had some sprouts ~3" high and ~3" across and noticed half a dozen white flies under the leaves of each one. I shook the bottle....sprayed some outside the house for a while to clear the nozzle then shot a few squirts on each plant before the dark period. The next morning I noticed some milky spots on the leaves and thought it was a good sign...the bugs wouldn't be landing there I thought...to my surprise, by that evening the little gals were burned every where there was a milky spot earlier. I almost ditched the grow to start over I was so pissed. They have recovered with new shoot's out the tops but those first couple sets of leaves look pretty shitty. I personally won't use this product again on any of my plants. Oh yeah, that was the 2nd bottle I owned...the 1rst bottle lasted a month or 2 and got something growing like a scum that was floating around inside and clogged the nozzle. Stupid me went back and bought more because it was "safe". I love Fox Farms products and have used the soil, nutes and granular's with great success....but "Don't Bug Me" is not for me anymore.

Yep. That happened to me too, with a previous grow. Pretty much killed all the bugs....and the plants. This is a little different, because I have several different strains. I'm pretty sure I could submerge the Skunk#1 in it. It isn't impacted at all. But, I have a Big Bang that seems to act like it's nute burned when I spray it significantly.

Since this happened, i switched to Doctor Doom aerosol for the sensitive plants. It actually has the exact same Pyretherin quantity as the active ingredient as Don't Bug Me, and is a fine aerosol fog that goes on more like a smokescreen than the fine mist that Don't Bug Me puts out. No significant amount of the liquid sits on the leaves and I have not had the same problem since.

Any idea how long people use these into the flower cycle? I just read that Pyrethrin degrades with one or two light cycles. I have no idea how accurate that is.... just wondering about anyone's experience with this.

Thanks for the advice on the aerosol....might get me some. Play it safe what ever you decide bro!

Oh, forgot to tell you and it's embarrassing to say.... when I was spraying my sprouts in the party cups I accidentally sprayed some on the hand holding the cup. I washed my hands good and forgot all about it. Later that afternoon I was dizzy as could be and had to wonder what I had eaten for lunch...then I remembered the spray. I gave my system a good flush with Coors Light and I was back to normal next morning.