Study of the mating behavior of Bactrocera dorsalis in Reunion Island

Hoareau Cécile. 2022. Study of the mating behavior of Bactrocera dorsalis in Reunion Island. Marseille : Université Aix-Marseille, 30 p. Mémoire de master 2 : Sciences et technologies de l'agriculture, de l'alimentation et de l'environnement.Biologie et biotechnologies environnementales (BBE) : Université Aix-Marseille

Encadrement : Moquet, Laura

Résumé : The oriental fruit fly Bactrocera dorsalis is a phytophagous invasive insect pest from the tropical and subtropical regions of Asia and was first detected in Reunion Island in 2017. It has since caused important damages in fruit production, particularly in mango production and led to important economic losses. To effectively control invasive insect pest populations, the Sterile Insect Technique can be used along other regulation methods, allowing to reduce the use of phytosanitary products. In this context, the investigation on the mating behavior of B. dorsalis is an important step in the study of the feasibility of the SIT. The objectives of this internship were to study the remating behavior of sterile and fertile laboratory males compared to wild fertile males of Reunion Island, as well as the remating behavior of wild females depending on their first mating with either male. The competitiveness of sterile males against wild males was also an important parameter to study. The remating experiments were conducted in laboratory conditions on several cohorts, and the 4 first competition experiments were led in semi-field conditions. We observed that the wild males remated less than the fertile and sterile laboratory males, and that the age of the flies influenced their sexual performances. The females' remating behavior wasn't impacted by their first mating with a sterile, fertile laboratory or wild male. We also observed a lower competitiveness of sterile males against wild males. In the context of the SIT, the similar ability of female remating inhibition by sterile and wild males as well as the higher remating number of sterile males are encouraging observations. Further studies need to be led on the competitiveness and the males' remating behavior, notably on their sperm transfer abilities.

Auteurs et affiliations

• Hoareau Cécile, Université Aix-Marseille (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/609147/)

Métriques

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