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Master Thesis

Spécificité et biologie d'Abrostola asclepiadis (Lep. Noctuidae), agent de biocontrôle potentiel contre les dompte-venins (Apocynaceae, Vincetoxicum spp.)

Abstract : Background: Swallow-worts (Vincetoxicum spp.) are invasive in North America, and cause increasing environmental and economical damages. At this point, no way to limit the invasion process does exist: the colonizing stock is very strong and little sensitive to chemical and mechanical control. A biological control program has started at the USDA-ARS in 2007. Several potential biocontrol agents have been listed and are progressively tested in EBCL. Abrostola asclepiadis (Lep. Noctuidae) is currently studied. Aim: Carry out specificity tests on a wide non-target species range, while working out experimentations dedicated to biological and behavioral observations of the insect. Main results: There are five larva instars which duration depends on external conditions (15 to 18 days on average on the lead tests). Head capsule width is a reliable criterion to distinguish larva instars (stage L1 : 0,50±0,02mm ; L2 : 0,76±0,03mm ; L3 : 1,20±0,03mm ; L4 : 1,79±0,04mm ; L5 : 2,55±0,08mm). No-choice tests showed that no larva achieved its development on another species than Vincetoxicum hirundinaria (host plant). They live on average 16,8 days on host plant (V. hirundinaria) against 2,2 days on non-target species. Conclusions and prospects: Abrostola asclepiadis keeps its biocontrol agent status. Unimplemented tests for lack of animal material are planned to complete this study in 2013.
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Master Thesis
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Submitted on : Monday, October 15, 2012 - 1:41:05 PM
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Marie-Eve Bayle. Spécificité et biologie d'Abrostola asclepiadis (Lep. Noctuidae), agent de biocontrôle potentiel contre les dompte-venins (Apocynaceae, Vincetoxicum spp.). Sciences agricoles. 2012. ⟨dumas-00741828⟩

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