Only my opinion,I have no proof, but I think it is not going to keep diluted. In fact, I prefer to use a new supply yearly. In use it is most effective against larvae in the earliest growth stage and to catch that stage I will use it weekly for up to three weeks. Al

thanks, al, i'll mix less next time, do you spray again after it rains?

do you spray again after it rains

Yes.

I kept some last year and it didn't keep even a week. Boy, did it stink!

Funny I just mixed some of this earlier today and was wondering the same thing. The smell is unbearable.

i'll spray again today since it rained yesterday, hummm the batch i mixed did not smell too bad, when you have allergies you don't smell much,lol

Which retailer in San Francisco sells BT?

Thanks.