I'd be interested in knowing this too. Also, if I use systemics in the soil, does that kill the BT? What did you use for mites?

What is BT?

if you use bt it needs to be used by itself - if something else is used it needs to be reapplied.

pagdnr: BT var israiliensis is a natural occurring bacterium that is found in soils - it is commonly used for mosquito pond control but can be used against fungus gnats.

jeff

Barry I mix a gallon at a time and use it that day but I'd assume that it will last for a while. I only need to treat my bog gardens with a dunk once a month.
Karyn