What’s my age again? Assessing the impact of stink bug egg mass age on host recognition by egg parasitoids Trissolcus basalis and Trissolcus japonicus (Hymenoptera: Scelionidae) - 2025
What’s my age again? Assessing the impact of stink bug egg mass age on host recognition by egg parasitoids Trissolcus basalis and Trissolcus japonicus (Hymenoptera: Scelionidae)
[en] Wasps, from the genus Trissolcus, are egg parasitoids that are commonly used in biological control programs targeting stink bugs. They navigate a complex environment, relying on a diverse array of biochemical and ecological cues to locate their hosts. Through this endeavour, these parasitoid wasps have to discriminate between young and old eggs as development is only achieved in the latter. In this study, we evaluated the ability of two parasitoid wasps, Trissolcus japonicus and Trissolcus basalis, on utilising short-range cues and, more specifically, volatile organic compounds emitted by stink bug egg masses to locate their hosts. We hypothesised that (1) stink bug eggs (i.e., Halyomorpha halys and Nezara viridula) emit short-range cues that are exploited by egg parasitoids (i.e., T. japonicus and T. basalis) to locate their hosts in addition to insect chemical footprints; (2) Trissolcus spp. Have the ability to differentiate young eggs from older ones to increase their fitness (3) based on changes in the chemical profiles of the egg masses according to their age. Our behavioural assays suggested that T. japonicus did not respond to stink bug footprints, whereas T. basalis was significantly oriented toward the footprints of gravid host females. Both parasitoids preferentially oriented towards young eggs rather than footprints. The parasitism rate of T. japonicus was not significantly different between young and old eggs unlike T. basalis which preferred parasitising on young eggs. We identified γ-butyrolactone and β-funebrene in the headspace of N. viridula eggs and we discussed the putative role of these secondary metabolites on T. basalis locating their host. Behavioural, performance and VOCs collection of this study contribute to a nuanced understanding of host–parasitoid dynamics along with implications for developing effective pest management strategies.
Research Center/Unit :
Agroscope de Changins (Suisse)
Disciplines :
Entomology & pest control
Author, co-author :
Sion, Anaïs ; Université de Liège - ULiège > TERRA Research Centre
Hiltpold Ivan; Agroscope de Changins (Suisse) > Entomologie et Nématologie
Verheggen, François ; Université de Liège - ULiège > Département GxABT > Gestion durable des bio-agresseurs
la Forgia Diana ✱; Agroscope de Changins (Suisse) > Entomologie et Nématologie
✱ These authors have contributed equally to this work.
Language :
English
Title :
What’s my age again? Assessing the impact of stink bug egg mass age on host recognition by egg parasitoids Trissolcus basalis and Trissolcus japonicus (Hymenoptera: Scelionidae)
Alternative titles :
[fr] Quel âge ai-je déjà ? Évaluation de l'impact de l'âge des masses d'œufs de punaises puantes sur la reconnaissance de l'hôte par les parasitoïdes des œufs Trissolcus basalis et Trissolcus japonicus (Hyménoptères : Scelionidae)
Original title :
[en] What’s my age again? Assessing the impact of stink bug egg mass age on host recognition by egg parasitoids Trissolcus basalis and Trissolcus japonicus (Hymenoptera: Scelionidae)
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