"Biological Control" in IPM refers to using the natural enemies of pests (predators, parasites, and pathogenic microorganisms) to control pest populations.

In the home environment, the application of biological control is limited but not completely non-existent: Indoors — house centipedes prey on cockroach nymphs and silverfish; spiders prey on flies and mosquitoes; it is not recommended to eliminate these "beneficial bugs.

" Outdoor garden — ladybugs and lacewings control aphids; parasitic wasps control caterpillars.

Microbial agents — Bti (Bacillus thuringiensis israelensis) is a highly effective biological insecticide against mosquito and drain fly larvae, and is safe for people and pets.

The advantages of biological control lie in its high selectivity, lack of resistance development, and environmental friendliness, but the effects are not instantaneous.

In residential IPM, encouraging and protecting existing natural enemy populations is a more practical strategy.