Volatiles from Maruca vitrata (Lepidoptera, Crambidae) host plants influence olfactory responses of the parasitoid Therophilus javanus (Hymenoptera, Braconidae, Agathidinae)

Souna, Djibril Aboubakar; Bokonon-Ganta, Aimé H.; Dannon, Elie Ayitondji; Imorou, Nazyhatou; Agui, Benjamin; Cusumano, Antonino; Srinivasan, R.; Pittendrigh, Barry R.; Volkoff, Anne-Nathalie; Tamò, Manuele

doi:10.1016/j.biocontrol.2018.11.002

Cited by 10 publications

(6 citation statements)

References 50 publications

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“…To check if there were significant differences in the percentage of choice between the alternatives of each olfactometry test, the chi-square test (χ 2 ) was applied, considering the expected proportion of 0.50 (50%) in each of the arms of the Y-tube olfactometer. The analyzes were performed in the statistical environment R Development Core Team (version 3.3.1) with a significance level of 5% (Aboubakar Souna et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Olfactory Response of the Green Lacewing Chrysoperla Externa to Volatile Organic Compounds of Eucalyptus Urograndis

Borges

Souza

Oliveira

et al. 2021

Preprint

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The evaluation of the direct effects of the relationship between plants and predators without considering the participation of herbivores can provide vital information for the study of ecological interactions and integrated pest management. In this context, the present work studied the behavioral responses of Chrysoperla externa (Neuroptera: Chrysopidae) larvae to the volatile organic compounds of young and mature, undamaged and damaged leaves of Eucalyptus urograndis (Myrtaceae), and investigate the chemical composition of leaf essential oils and their effects on the green lacewing. The responses of the C. externa larvae to the odors emitted by leaves were evaluated by an experimental behavior test using a Y-tube olfactometer. The essential oil was extracted by hydrodistillation of the young and mature leaves with and without damage. The larvae respond attractively to the volatiles emitted without the participation of herbivores, and it selected preferentially odors emitted by young leaves with simulated herbivory. The chemical composition was analyzed using gas chromatography coupled with mass spectrometry. This research identified 32 compounds; some of them had not been identified in other studies. Young leaves had a higher content of essential oil compared to mature leaves. Among the compounds identified, eucalyptol, α-Terpineol, Aromadendrene, and α-Terpinyl acetate are the major compounds. An inversion in the content of eucalyptol (which decreases) and α-terpinyl acetate (which increases) is observed when young and mature leaves are damage. Thus, this work contributed with basic data on the potential use of eucalyptus forests as maintainers of natural chrysopids populations.

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Section: Discussionmentioning

confidence: 99%

Olfactory Response of the Green Lacewing Chrysoperla Externa to Volatile Organic Compounds of Eucalyptus Urograndis

Borges

Souza

Oliveira

et al. 2021

Preprint

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“…The egg parasitoids include P. syleptae and Trichogramma spp. [ 67 , 72 , 73 , 74 ]. Tachinid flies have also been identified as larval parasitoids [ 67 , 68 ].…”

Section: The Use Of Biological Control As a Central Focus For Aphis Fabae And Maruca Vitrata Contromentioning

confidence: 99%

“…These can be used to improve the conservation biological control. For instance, volatiles released by damaged M. vitrata host plants (cowpea and pea bush) attracted the braconid Therophilus javanus and the parasitic fly Nemorilla maculosa [ 73 , 116 ]. This was also the case for volatile compounds produced by Vicia faba damaged by A. fabae , which attracted a parasitoid ( Lysiphlebus fabarum ) and a predator ( Orius albidipennis ) [ 117 ].…”

Section: The Use Of Biological Control As a Central Focus For Aphis Fabae And Maruca Vitrata Contromentioning

confidence: 99%

Natural Pest Regulation and Its Compatibility with Other Crop Protection Practices in Smallholder Bean Farming Systems

Ndakidemi

Mbega

Ndakidemi

et al. 2021

Biology

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Common bean (Phaseolus vulgaris) production and storage are limited by numerous constraints. Insect pests are often the most destructive. However, resource-constrained smallholders in sub-Saharan Africa (SSA) often do little to manage pests. Where farmers do use a control strategy, it typically relies on chemical pesticides, which have adverse effects on the wildlife, crop pollinators, natural enemies, mammals, and the development of resistance by pests. Nature-based solutions —in particular, using biological control agents with sustainable approaches that include biopesticides, resistant varieties, and cultural tools—are alternatives to chemical control. However, significant barriers to their adoption in SSA include a lack of field data and knowledge on the natural enemies of pests, safety, efficacy, the spectrum of activities, the availability and costs of biopesticides, the lack of sources of resistance for different cultivars, and spatial and temporal inconsistencies for cultural methods. Here, we critically review the control options for bean pests, particularly the black bean aphid (Aphis fabae) and pod borers (Maruca vitrata). We identified natural pest regulation as the option with the greatest potential for this farming system. We recommend that farmers adapt to using biological control due to its compatibility with other sustainable approaches, such as cultural tools, resistant varieties, and biopesticides for effective management, especially in SSA.

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“…In the case of a parasitoid, this knowledge is a prerequisite prior to its introduction in a novel environment as a biological control agent 3 . Already, the biological potential of this newly introduced natural enemy has been investigated with regard to reproductive biology 4 and the ability of this natural enemy to localize a plant-feeding M. vitrata caterpillar 5 . However, life traits estimation could provide additional and critical information on quantitative and ecological function of natural enemies 6 , and population growth can be estimated by assessing fertility life table parameters 7 .…”

Section: Introductionmentioning

confidence: 99%

Progeny fitness determines the performance of the parasitoid Therophilus javanus, a prospective biocontrol agent against the legume pod borer

Souna

Bokonon-Ganta

Ravallec

et al. 2021

Sci Rep

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Therophilus javanus (Bhat & Gupta) is an exotic larval endoparasitoid newly imported from Asia into Africa as a classical biological control agent against the pod borer Maruca vitrata (Fabricius). The parasitoid preference for the five larval instars of M. vitrata and their influence on progeny sex ratio were assessed together with the impact of larval host age at the time of oviposition on development time, mother longevity and offspring production. In a choice situation, female parasitoids preferred to oviposit in the first three larval instars. The development of immature stages of the parasitoid was observed inside three-day-old hosts, whereby the first two larval instars of T. javanus completed their development as endoparasites and the third larval instar as ectoparasite. The development time was faster when first larval instars (two- and three-day-old) of the host caterpillars were parasitized compared to second larval instar (four-day-old). The highest proportion of daughters (0.51) was observed when females were provided with four-day-old hosts. The lowest intrinsic rate of increase (r) (0.21 ± 0.01), the lowest rate of increase (λ) (1.23 ± 0.01), and the lowest net reproductive rate (Ro) (35.93 ± 6.51) were recorded on four-day-old hosts. These results are discussed in the light of optimizing mass rearing and release strategies.

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Volatiles from Maruca vitrata (Lepidoptera, Crambidae) host plants influence olfactory responses of the parasitoid Therophilus javanus (Hymenoptera, Braconidae, Agathidinae)

Abstract: Highlights The foraging behavior of T. javanus is influenced by pod borer M. vitrata host plants. Among wild host plant species, T. javanus is more attracted by odors of T. platycarpa. In cowpea, the cultivated host, infested pods are more attractive to T. javanus than infested flowers.

Cited by 10 publications

References 50 publications

Olfactory Response of the Green Lacewing Chrysoperla Externa to Volatile Organic Compounds of Eucalyptus Urograndis

Olfactory Response of the Green Lacewing Chrysoperla Externa to Volatile Organic Compounds of Eucalyptus Urograndis

Natural Pest Regulation and Its Compatibility with Other Crop Protection Practices in Smallholder Bean Farming Systems

Progeny fitness determines the performance of the parasitoid Therophilus javanus, a prospective biocontrol agent against the legume pod borer

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