Lacewings also eat aphids, leafhoppers, and larvae of other insects. ... Pesticides cannot discern if an insect is a good or a bad bug in your garden. It is designed to kill the insect. So even an organic pesticide such as Bacillus thuringiensis (BT) or Neem Oil will kill beneficial insects.

What insects does Bacillus thuringiensis kill?

Depending on which strain is used, Bt continues to be effective on cabbage worms, tent caterpillars, potato beetles, mosquitoes, black fly and a variety of other insect pests.

How do you kill lacewings?

Apply a low-toxicity insecticide, such as horticultural oil or insecticidal soap, to the entire plant. Fully cover the plant, as these insecticides kill pests on contact but typically leave natural enemies undisturbed. Reapply once every two weeks until the problem has subsided.