please read the label...but with most insecticides it should be alternated with another insecticide. BT and spinosad generally target different bugs. i.e. BT for caterpillars only.

I did read the label before I posted. It says it can be applied every four days. I just wanted to hear from people who use it how often they use it. But since they were no answers anyway I'm just following label directions.

I use Spinosad every 7-10 days for Citrus Leaf Miners...then a week or so later I spray it with Neem oil...I alternate it every other week or so...Until the 'new growths' have hardened off.

I have a limited landscape maintenance license...I read in the CEU material that you use one for several weeks then rotate and use another for several weeks. This was new to me because I always had alternated every other week too. food for thought.

Spinosad mixed with serenade weekly for me. I use azamax every few weeks instead of spinosad not mixed with the serenade. I have good results. The key for me is prevention. Once I have bugs or disease, it's a struggle to get rid of them.