Bugs to kill Bugs

I was doing some research recently in an effort to help a friend. Using a combination of soil dwelling predators along with foliage dwelling (Ladybugs) helps to kill them in different stages of their life cycle. If I were to face this issue, this is the approach I would try. Also, I now treat to prevent during veg. For pests I alternate Neem oil at half strength and Spinosad at 2/3 strength. Some plants seem sensitive to my sprays which is why I am trying diluted mixes used on a regular basis , and still dialing in my process. Better to prevent problems from occurring in the first place. Good luck and happy growing.