Lutte biologique contre le parasite apicole Varroa destructor à l'aide de l'acarien prédateur Stratiolaelaps scimitus

Authors: Rondeau, Sabrina
Advisor: Fournier, ValérieGiovenazzo, Pierre
Abstract: By feeding on the hemolymph and fat bodies of the honey bee (Apis mellifera L.) and transmitting many viruses, the parasitic mite Varroa destructor (Acari: varroidae) is considered as the main cause of honey bee colony losses. The use of chemicals in varroa control shows many disadvantages, such as the development of mite resistance to synthetic acaricides and a variable toxicity for bees. Through the use of natural enemies, the biological control of varroa mites could represent a sustainable and safe avenue for colony health. The main objective of this study was to test the effectiveness of the predatory mite Stratiolaelaps scimitus (Acari: Lealapidae) as a means of biological control against varroa mites. A study of the predator’s feeding behaviour was first performed to evaluate the risk of predation of bee brood (eggs, larvae and pupae) by S. scimitus, as well as its predation potential upon phoretic varroa mites (varroa parasitizing adult bees). In vivo trials were then carried out to evaluate the effectiveness of two predator introduction rates (6,250 or 12,500 mites / colony) to control varroa populations in honey bee colonies in September (compared to the organic acaricide Thymovar®) and in November (compared to oxalic acid). Although S. scimitus is able to feed on all bee developmental stages in the laboratory, our results suggest that the predator does not pose a threat to the bee brood when introduced into the colony. On the other hand, our results demonstrate that the predator is not able to control varroa populations in bee colonies under the tested conditions, that is, when it is introduced in fall according to the rate currently recommended by some biocontrol suppliers. This ineffectiveness is probably related to the inability of the predator to attack phoretic varroa mites.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 18 October 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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