Biopesticides are pesticides derived from natural materials such as animals, plants, bacteria, and certain minerals. They are used in pest management as an alternative to synthetic pesticides, which can have harmful effects on the environment and human health.

Bacteria and fungi are two types of microorganisms commonly used as biopesticides. These organisms can be used to control pests such as insects, fungi, and weeds. For example, Bacillus thuringiensis (Bt) is a bacterium that produces a toxin that kills certain insects. Fungi such as Beauveria bassiana and Metarhizium anisopliae are used as biopesticides to control insect pests, while Trichoderma species are used to control plant diseases.

Flowering plants are not commonly used as biopesticides, but some plant species are known to produce compounds with pesticidal properties. For example, pyrethrin is a natural insecticide produced by certain species of chrysanthemums. However, these plant-based compounds are more commonly used in traditional medicine or as herbal remedies, rather than in pest management.