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Efficacité des ennemis naturels deLantana camara à Guam : évaluation locale et saisonnière

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Abstract

As part of a continuing effort to eliminate or, at least, reduceLantana camara L., a weed commonly found in Guam, biweekly surveys were conducted over a four and a halfyear period to determine the effectiveness of the weed’s natural enemies in reducing plant vigor and viable seed numbers. A total of eight biocontrol agents were monitored. The leaf damaging insects were the hispine beetle,Uroplata girardi Pic. (Col.: Chrysomelidae), the tingid bug,Teleonemia scrupulosa Stål (Hem.: Tingidae), the leafminer fly,Calycomyza lantanae Frick (Dip.: Agromyzidae) and the noctuid moth,Hypena strigata (F.) (Lep: Noctuidae). The moths,Lantanophaga pusillidactyla (Walker) (Lep.: Pterophoridae),Epinotia lantana (Busck) (Lep.: Tortricidae) andAdoxopheyes melia Clarke (Lep.: Tortricidae) andT. scrupulosa were the flower damaging insects.E. lantana and the seedfly,Ophiomyia lantanae (Froggatt) (Dip.: Agromyzidae) accounted for berry losses. An empirical biocontrol model was fitted to the observed data. The model estimated that the eight biocontrol agents prevented the production of or damaged 225.9 berries per square meter per biweekly observation period. Observed production was only 96.1 undamaged berries per square meter per observation period. Thus, the biocontrol agents were reducing potential berry production by 70.1 percent. The biocontrol model was also used to estimate the individual contributions of the eight agents to the overall control ofL. camara on Guam

Résumé

Dans un effort continu pour éradiquer ou au moins, réduire, la présence deLantana camara L., advantice bien répandue à Guam, un suivi bi-mensuel a été effectué, sur une période de 4 ans et demi, pour étudier l’efficacité des ennemis naturels à affaiblir la plante et à diminuer le nombre de graines viables. Au total, huit agents de lutte biologique ont été recensés. Les insectes s’attaquant aux feuilles sont :Uroplata girardi Pic. (Col. : Chrysomelidae),Teleonemia scrupulosa Stäl (Hem. : Tingidae),Calycomyza lantanae Frick (Dip. : Agromyzidae) etHypena strigata (F.) (Lep. : Noctuidae). Les papillons de nuitLantanophaga pusillidactyla (Walker, (Lep. : Pterophoridae),Epinotia lantana (Busck) (Lep. : Tortricidae) etAdoxopheyes melia Clarke (Lep. : Tortricidae) s’attaquent aux fleurs ainsi queT. scrupulosa. E. lantana etOphomyia lantanae (Froggatt) (Dip. : Agromyzidae) font des dégâts aux fruits. Un modèle empirique de lutte biologique a été établi à partir des données observées. Le modèle a mis en évidence que les 8 auxiliaires empêchent la production ou détruisent 225,9 baies par mètre carré sur une période d’observation de deux semaines. Sur cette même période, la production de fruits non abîmés observée au mètre carré n’est que de 96,1. Ainsi, les auxiliaires réduisent la production potentielle de fruits de 70,1 %. Le modèle a aussi permis d’estimer le rôle tenu par chaque auxiliaire dans la lutte biologique globale contreL. camara à Guam

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Author notes

  1. G. R. W. Denton

    Present address: Water and Energy Research Institute, University of Guam, 96923, Mangilao, Guam, USA

Authors and Affiliations

  1. Agricultural Experiment Station, University of Guam, 96923, Mangilao, Guam, USA

    R. Muniappan, G. R. W. Denton, J. W. Brown, T. S. Lali, U. Prasad & P. Singh

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  1. R. Muniappan
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  2. G. R. W. Denton
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  3. J. W. Brown
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  4. T. S. Lali
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  5. U. Prasad
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  6. P. Singh
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Muniappan, R., Denton, G.R.W., Brown, J.W. et al. Efficacité des ennemis naturels deLantana camara à Guam : évaluation locale et saisonnière. Entomophaga 41, 167–182 (1996). https://doi.org/10.1007/BF02764244

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