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An insect growth regulator (IGR) is a chemical insecticide that kills insects indirectly by disrupting their life cycles. [1] The term was initially proposed to describe the effects of juvenile hormone analogs. [2] Although the term "insect growth disruptor" more accurately describes the actions of IGRs, it did not become widely used. [1]
Pyriproxyfen is a juvenile hormone analog (IRAC group 7C) and an insect growth regulator. [7] It prevents larvae from developing into adulthood and thus rendering them unable to reproduce. [8] In the US, pyriproxyfen is often marketed under the trade name Nylar, [9] and is one of two active ingredients in Advantage II.
Buprofezin is an insecticide used for control of insect pests such as mealybugs, leafhoppers and whitefly on vegetable crops. It is a growth regulator, acting as an inhibitor of chitin synthase (IRAC group 16). [2]
They do not directly kill the insect, but disrupt moulting and egg hatch, and thus act as insect growth regulators. They act by inhibiting chitin synthase, [2] preventing the formation of chitin in the insect's body. The insecticidal activity of the BPUs was discovered serendipitiously at Phillips-Duphar who commericalised diflubenzuron in 1975 ...
Insect growth regulator (IGR) is a term coined to include insect hormone mimics and an earlier class of chemicals, the benzoylphenyl ureas, which inhibit chitin (exoskeleton) biosynthesis in insects [42] Diflubenzuron is a member of the latter class, used primarily to control caterpillars that are pests.
Methoprene is a juvenile hormone (JH) analog which acts as a growth regulator when used as an insecticide (IRAC group 7A). It is an amber-colored liquid with a faint fruity odor. Methoprene does not kill insects. Instead, it interferes with an insect’s life cycle and prevents it from reaching maturity or reproducing. [2]