Biopesticides are made from naturally occurring substances that controls pests by non-toxic mechanisms and in ecofriendly manner. They may be derived from animals (e.g. nematodes), plants (Chrysanthemum, Azadirachta) and microorganisms (e.g. Bacillus thuringiensis, Trichoderma, Nucleopolyhedrosis virus), and include living organisms (natural enemies), their products (phytochemicals, microbial products) or byproducts (semiochemicals) . Hence biopesticides pose less threat to the environment and human health. They are generally less toxic than chemical pesticides, often target-specific, have little or no residual effects and have acceptability for use in organic farming. Biopesticides generally fall into three major categories: (i) microbial, (ii) biochemical, and (iii) plant-incorporated protectants (PIPs) .
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