Bugs while budding.. help please

Hi,
My plants seem to have attracted some little white butterflys. T

hey appeared a few months back and there were eggs on the leaves so I got some Yates Pyrethrum from the local plant shop to try get rid of them. Only had to spray once and it worked, got rid of the pests.

However these bugs seem to have come back and I've noticed a few eggs on the leaves again. Plants have been flowering for a couple of weeks.

Is it still safe to spray them now buds have started to form? I got the Pyrethrum stuff as it said it was natural.

Need some expert advice.

Cheers.

http://en.wikipedia.org/wiki/Pyrethrum
it sounds safe, it is a plant so i think ittll be safe if you smoke the buds later, not like much will be on the final product anyways though

Thanks for the reply man.

No one else is offering advice so I just sprayed em. Sounds pretty safe so fingers crossed.

you'll be fine i heard on the grow report it evaporates quick enough you can use it pretty much till a few days before harvest. On the bottle of spray i got it says the same thing