Dipel may be pushed as an "organic pesticide" but it really a biological weapon intended to kill chewing insects.
The active ingreediant is a bacterium named Bacillus thuringiensis. When an insect larva eats the BT spores, it becomes infected, swells up and dies. Eventually, the drying dead larva explodes, throwing millions of spores into the air.
The new spores go everywhere. Into the nearby forest even into the atmosphere, evenntually landing on plants where the process continues for ever. Once you have used BT, you can't reverse the damage. The gift that keeps on giving for ever.
Some people claim that the butterfly population in the US has dropped to less than 1% of what it was 40 years ago. Look no farther than Dipel and related products pushed on us as "organic". Thanks a lot.