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Diamide insecticides

From Wikipedia, the free encyclopedia
Class of insecticide
Flubendiamide, a phthalic diamide insecticide
Chlorantraniliprole, an anthranilic diamide insecticide
Cyantraniliprole, another anthranilic diamide insecticide

Diamide insecticides are a class ofinsecticides, active mainly againstlepidoptera (caterpillars), which act on the insectryanodine receptor. They are diamides of eitherphthalic acid oranthranilic acid, with various appropriate further substitutions.[1][2]

Worldwide sales of diamides in 2018 were estimated atUS$2.4 billion, which is 13% of the $18.4 billion insecticide market.[3]

History and examples

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The first diamide wasflubendiamide. It was invented by Nihon Nohyaku and commercialised in 2007.[1] It is a highly substituted diamide of phthalic acid and is highly active against lepidoptera (caterpillers).[1][2] Later DuPont introducedchlorantraniliprole, which is more active against caterpillers and in addition active against other insect types.[1][2]Cyanthraniliprole, introduced later, shows systemic activity and is also active against sucking pests such asaphids andwhitefly.[2]

According to one review, the first species reported to show resistance to diamides was thediamondback moth in 2012.[4]

The following diamides have been given ISO common names.[5]Flubendiamide andcyhalodiamide are phthalic[6] diamides.[5]Chlorantraniliprole,cyantraniliprole,cyclaniliprole,fluchlordiniliprole,pioxaniliprole,tetrachlorantraniliprole,tetraniliprole, andtiorantraniliprole are anthranilic[7] diamides.[5] Eight diamide insecticides have been commercialized as of February 2023.[2]

Mechanism of action

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Ryanodine receptor in the open position; the calcium channel is at the center.

Diamides selectively activate insectryanodine receptors (RyR), which are largetetrameric ryanodine-sensitivecalcium release channels present in thesarcoplasmic reticulum andendoplasmic reticulum in neuromuscular tissues.[8] The ryanodine receptor is also the target of thealkaloid insecticideryanodine, after which it is named, although it addresses a different binding site on the receptor.[8] A 3.2-Å structure of cyanthraniliprole bound to a ryanodine receptor has been determined, which informs on themechanism of action as well as various mutations causingresistance.[2]

The binding of diamides or ryanodine to the calcium channels causes them to remain open, leading to the loss of calcium crucial for biological processes.[9] Specifically, calcium release is essential for muscle contraction and therefore locomotion.[10] Ryanodine receptors are the only major calcium release channels of the sarco/endoplasmic reticulum.[10] The forcing open of these channels then causes insects to act lethargic, stop feeding, and eventually die.[9]

The diamides are classified underIRAC group 28.[11]

Toxicity

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Diamides show low acute mammalian toxicity and appear to safe for bees.[12]

A metabolite of flubendiamide is very persistent and toxic toaquatic invertebrates, causing flubendiamide to be banned by the United StatesEPA.[13]

References

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  1. ^abcdJeanguenat, Andre (28 August 2012)."The story of a new insecticidal chemistry class: the diamides".Pest Management Science.69 (1): 7−14.doi:10.1002/ps.3406.PMID 23034936.
  2. ^abcdefDu, Shaoqing; Hu, Xueping (February 15, 2023)."Comprehensive Overview of Diamide Derivatives Acting as Ryanodine Receptor Activators".Journal of Agricultural and Food Chemistry.71 (8):3620–3638.Bibcode:2023JAFC...71.3620D.doi:10.1021/acs.jafc.2c08414.PMID 36791236.
  3. ^Sparks, Thomas C (2024)."Insecticide mixtures—uses, benefits and considerations".Pest Management Science.81 (3):1137–1144.doi:10.1002/ps.7980.PMID 38356314 – via Wiley.
  4. ^Richardson, Ewan B.; Troczka, Bartlomiej J.; Gutbrod, Oliver; Davies, T. G. Emyr; Nauen, Ralf (2020-06-01)."Diamide resistance: 10 years of lessons from lepidopteran pests".Journal of Pest Science.93 (3):911–928.Bibcode:2020JPesS..93..911R.doi:10.1007/s10340-020-01220-y.ISSN 1612-4766.
  5. ^abc"Compendium of Pesticide Common Names. Insecticides".British Crop Production Council (BCPC). Retrieved12 November 2024.
  6. ^This can be determined by examination of the chemical structure
  7. ^This can be determined by examination of the chemical structure
  8. ^abNauen, Ralf; Steinbach, Denise (27 August 2016)."Resistance to Diamide Insecticides in Lepidopteran Pests". In Horowitz, A. Rami; Ishaaya, Isaac (eds.).Advances in Insect Control and Resistance Management. Cham: Springer (published 26 August 2016). pp. 219–240.doi:10.1007/978-3-319-31800-4_12.ISBN 978-3-319-31800-4.
  9. ^abTeixeira, Luís A; Andaloro, John T (2013). "Diamide insecticides: Global efforts to address insect resistance stewardship challenges".Pesticide Biochemistry and Physiology.106 (3):76–78.Bibcode:2013PBioP.106...76T.doi:10.1016/j.pestbp.2013.01.010.
  10. ^abSantulli G, Marks AR (2015). "Essential Roles of Intracellular Calcium Release Channels in Muscle, Brain, Metabolism, and Aging".Current Molecular Pharmacology.8 (2):206–222.doi:10.2174/1874467208666150507105105.PMID 25966694.
  11. ^Sparks, Thomas C; Storer, Nicholas; Porter, Alan; Slater, Russell; Nauen, Ralf (2021)."Insecticide resistance management and industry: the origins and evolution of the I nsecticide R esistance A ction C ommittee (IRAC) and the mode of action classification scheme".Pest Management Science.77 (6):2609–2619.Bibcode:2021PMSci..77.2609S.doi:10.1002/ps.6254.ISSN 1526-498X.PMC 8248193.PMID 33421293.
  12. ^Jeschke, Peter; Witschel, Matthias; Krämer, Wolfgang; Schirmer, Ulrich (25 January 2019)."Chapter 36, Insecticides Affecting Calcium Homeostasis".Modern Crop Protection Compounds, Volume 3: Insecticides (3rd ed.). Wiley-VCH. pp. 1541–1583.doi:10.1002/9783527699261.ch36.ISBN 9783527699261.
  13. ^"Flubendiamide – Notice of Intent to Cancel and Other Supporting Documents".United States Environmental Protection Agency. February 14, 2024. Retrieved12 November 2023.


Carbamates
Inorganic compounds
Insect growth regulators
Neonicotinoids
Organochlorides
Organophosphorus
Pyrethroids
Diamides
Other chemicals
Metabolites
Biopesticides
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