Instead of Bt’s one or two days’ residual, spinosad keeps killing for up to four weeks. In addition, spinosad kills thrips, which Bt doesn’t faze.

Can you use Bt and spinosad?

It’s always a good idea to vary insect control methods in the vegetable garden so consider alternating Bt with a product containing the active ingredient spinosad (also derived from a soil bacterium and also organic).

What type of pesticide is Bt?

Bacillus thuringiensis (or Bt) is a Gram-positive, soil-dwelling bacterium, the most commonly used biological pesticide worldwide.