Les régulateurs de croissance d'insectes (RCI), mimiques de l'hormone juvénile, en tant que moyen de lutte morphogénétique et ovicide contre les tordeuses des vergers
1989
Charmillot, P.-J.
SUMMARY: Insect growth regulators (IGR), mimics of juvenile hormone, as morphogenetical and ovicidal means of control against orchard tortricids Metamorphosis is regulated by a complex hormonal balance in which juvenile hormone (JH) plays an important part. At the last larval instar the content of JH is particularly low in the insect body. If an insect growth regulator (IGR) - a mimic of JH - is applied at this time, the pupal moult may be disturbed with the characteristic morphogenetical deformations. The JH content is also very low in freshly laid eggs. Therefore IGR treatments may disturb the embryonic development of some species and produce an ovicidal activity. During a few years two IGR - fenoxycarb and CGA 45′ 128 - were evaluated for their morphogenetical effect on the last larval instar of Adoxophyes orana F.v.R. and their ovicidal effect on freshly laid eggs of Cydia pomonella L. and Grapholita funebrana Tr. After a few years of experimentation with both compounds and of commercialisation of fenoxycarb in European orchards, IGR confirmed to present a considerable improvement in integrated pest management due to selectivity, and low mammal toxicity.
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