Abstract
Lufenuron, N-[2,5-dichloro-4-(1,1,2,3,3,3- hexafluoropropoxy) -phenylaminocarbonyl]-2,6-difluorobenzamide, a novel acylurea insect growth regulator, exerted significant sublethal effects in larvae, pupae and adults of the diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae). Second, third and fourth instars were treated at their respective LC50 using a standard ‘leaf-disc dip’ method of bioassay. Sizes and weights of pupae from the treated lots were significantly reduced but larval and pupal durations remained unaffected. All the pupae formed from larvae treated as fourth instars were deformed and produced no adults. Only 38 and 14% of adults.emerged from the pupae formed following treatment at the second and third instar, respectively, as compared to 88–92% adult emergence in the controls. Apart from significant reduction in body length, some adults from the treatments had fringed and twisted wings which prevented normal flight. IGR treatment also resulted in pronounced reduction in fecundity (up to 10.2 eggs per female in comparison with 135.8 per female in the control) and oviposition periods (up to 3.2 days in comparison to 7.8 days in the control). Field trials to investigate the management of P. xylostella using lufenuron are recommended.
Résumé
Un nouveaurégulateur de croissance d’insecte, le lufenuron N-[2,5-dichloro-4- (1,1,2,3,3,3-hexafluoropropoxy) -phenylaminocarbonyl]-2,6- difluorobenzamide, a exercé un effet sous-létal significatif sur les larves, chrysalides et adultes de la teigne Plutella xylostella (Linnaens) (Lepidoptera: Plutellidae). Les larves des second, troisième et quatrième stades ont été traitées avec leurs DL50 respectives en utilisant une méthode standard d’essai biologique par immersion de rondelles des feuilles. La taille et le poids des chrysalides issues des lots traités ont été sensiblement réduits mais les durées de développements larvaire et nymphal sont demeurées inchangées. Seulement 38 et 14% d’adultes ont respectivement émergé des chrysalides formées après le traitement des larves de deuxième et troisième stade, en comparaison de 88–92% d’adultes émergés dans le témoin. Aucun adulte n’est sorti des chrysalides issues des larves de quatrième stade traitées, puisque toutes ces chrysalides ont été malformées. Indépendamment d’une réduction significative de la longueur du corps, quelques adultes provenant des lots traités avaient des ailes frangées et tordues qui les empêchaient de voler normalement. Le traitement au régulateur de croissanse a également provoqué une réduction prononcée de la fécondité (jusqu’à 10,2 contre 135,8 oeufs par femelle dans le témoin) et des périodes d’oviposition (jusqu’à 3,2 jours par rapport à 7,8 jours dans le témoin). On suggère de conduire des essais en milieu réel pour étudier l’effet du lufenuron dans la lutte contre P. xylostella.
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Josan, A., Singh, G. Sublethal Effects of Lufenuron on the Diamondback Moth, Plutella xylostella (Linnaeus). Int J Trop Insect Sci 20, 303–308 (2000). https://doi.org/10.1017/S1742758400015666
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DOI: https://doi.org/10.1017/S1742758400015666