Effectiveness of using natural enemies to combat pests depends on surroundings

When cabbage looper moth larvae infest a field, sustainable growers will often try to control the pests by releasing large numbers of predators, such as ladybugs. That way they can avoid spraying expensive and environmentally harmful insecticides.

source https://www.lifetechnology.com/blogs/life-technology-news-blog/effectiveness-of-using-natural-enemies-to-combat-pests-depends-on-surroundings