Single-step PCR differentiation of<i>Cotesia sesamiae</i>(Cameron) and<i>Cotesia flavipes</i>Cameron (Hymenoptera: Braconidae) using polydnavirus markers

Dupas, Stéphane; Gitau, Catherine W.; Rü, Bruno Le; Silvain, Jean‐François

doi:10.1080/00379271.2006.10697463

Cited by 12 publications

(6 citation statements)

References 12 publications

(6 reference statements)

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“…The morphological identification of species of the flavipes complex relies on a combination of slight differences, and their observation requires specific expertise, so a molecular diagnoses using CO1 or the virulence gene CrV1 (Dupas et al 2006; Branca et al 2011) remains the easiest identification method.…”

Section: Discussionmentioning

confidence: 99%

Systematics and biology of Cotesia typhae sp. n. (Hymenoptera, Braconidae, Microgastrinae), a potential biological control agent against the noctuid Mediterranean corn borer, Sesamia nonagrioides

Kaiser

Fernandez-Triana²,

Capdevielle‐Dulac

et al. 2017

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Many parasitoid species are subjected to strong selective pressures from their host, and their adaptive response may result in the formation of genetically differentiated populations, called host races. When environmental factors and reproduction traits prevent gene flow, host races become distinct species. Such a process has recently been documented within the Cotesia flavipes species complex, all of which are larval parasitoids of moth species whose larvae are stem borers of Poales. A previous study on the African species C. sesamiae, incorporating molecular, ecological and biological data on various samples, showed that a particular population could be considered as a distinct species, because it was specialized at both host (Sesamia nonagrioides) and plant (Typha domingensis) levels, and reproductively isolated from other C. sesamiae. Due to its potential for the biological control of S. nonagrioides, a serious corn pest in Mediterranean countries and even in Iran, we describe here Cotesia typhae Fernandez-Triana sp. n. The new species is characterized on the basis of morphological, molecular, ecological and geographical data, which proved to be useful for future collection and rapid identification of the species within the species complex. Fecundity traits and parasitism success on African and European S. nonagrioides populations, estimated by laboratory studies, are also included.

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Section: Discussionmentioning

confidence: 99%

Systematics and biology of Cotesia typhae sp. n. (Hymenoptera, Braconidae, Microgastrinae), a potential biological control agent against the noctuid Mediterranean corn borer, Sesamia nonagrioides

Kaiser

Fernandez-Triana²,

Capdevielle‐Dulac

et al. 2017

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“…So risks on nontarget hosts appear unlikely, but cannot be excluded because studies by Barratt et al ( 2012 ) showed that introduced parasitoids could shift on nontarget exotic hosts phylogenetically related to the native hosts. Other advantages are that it is reliably identifiable using molecular markers (Dupas et al 2006 ), there are ecological indicators for collecting it from the wild, and reproductive isolation from other populations of the C . flavipes complex predicts the absence of interference with native parasitoids.…”

Section: Discussionmentioning

confidence: 99%

Ongoing ecological speciation in Cotesia sesamiae, a biological control agent of cereal stem borers

Kaiser

Rü

Kaoula

et al. 2015

Evolutionary Applications

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To develop efficient and safe biological control, we need to reliably identify natural enemy species, determine their host range, and understand the mechanisms that drive host range evolution. We investigated these points in Cotesia sesamiae, an African parasitic wasp of cereal stem borers. Phylogenetic analyses of 74 individual wasps, based on six mitochondrial and nuclear genes, revealed three lineages. We then investigated the ecological status (host plant and host insect ranges in the field, and host insect suitability tests) and the biological status (cross-mating tests) of the three lineages. We found that one highly supported lineage showed all the hallmarks of a cryptic species. It is associated with one host insect, Sesamia nonagrioides, and is reproductively isolated from the other two lineages by pre- and postmating barriers. The other two lineages had a more variable phylogenetic support, depending on the set of genes; they exhibited an overlapping and diversified range of host species and are not reproductively isolated from one another. We discuss the ecological conditions and mechanisms that likely generated this ongoing speciation and the relevance of this new specialist taxon in the genus Cotesia for biological control.

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“…The PDV genes are expressed in the host larvae, causing the destruction of haemocytes, thus preventing encapsulation of the eggs (Beckage and Gelman 2004). Recent studies revealed two types of PDVs that are distinguishable by CrV1 gene sequences (Dupas et al. 2006).…”

Section: Discussionmentioning

confidence: 99%

Lepidopteran cereal stemborers and associated natural enemies on maize and wild grass hosts in Cameroon

Ndemah

Schulthess

Rü

et al. 2007

J Applied Entomology

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In Cameroon, the noctuid Busseola fusca is the most important pest of maize. The braconid Cotesia sesamiae, which is the most common larval parasitoid of noctuid stemborers in eastern Africa, was absent on B. fusca attacking maize. Thus, it is planned to introduce several strains of the parasitoid from Kenya. Pre-release surveys were undertaken in major maize growing areas to catalogue stemborer species, and larval and pupal parasitoids on maize and four wild host plant species. On maize, B. fusca was the predominant borer in all ecozones except for the lowland coastal forest, usually accounting for 60-99%, followed by the pyralid Eldana saccharina in the forest zone and the crambid Chilo sp. in the mid-altitudes. Contrary to what was reported before, the noctuid Poeonoma serrata -and not B. fusca -was the predominant borer on elephant grass, constituting 70-96% of all borers. On wild sorghum in the forest zone, the noctuid Sesamia poephaga was the most abundant species, while on Panicum sp., Chilo sp. predominated. On Setaria megaphylla in the forest zone, Chilo sp. was the most abundant species followed by Busseola quadrata. Busseola fusca was scarce on all wild grass species, indicating that previous reports on the predominance of this pest species on wild host plants were the result of misidentifications. Three tachinid and 16 hymenopteran parasitoids were obtained, most of them from B. fusca and P. serrata, on maize and Pennisetum purpureum respectively. C. sesamiae was scarce and never recovered from B. fusca on maize. In view of the new findings, acceptability and suitability studies involving the different stemborer species identified from wild plant hosts are required to determine if they will form a reproductive sink or perennate C. sesamiae populations during the off-season when maize is scarce and B. fusca is diapausing.

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Single-step PCR differentiation ofCotesia sesamiae(Cameron) andCotesia flavipesCameron (Hymenoptera: Braconidae) using polydnavirus markers

Cited by 12 publications

References 12 publications

Systematics and biology of Cotesia typhae sp. n. (Hymenoptera, Braconidae, Microgastrinae), a potential biological control agent against the noctuid Mediterranean corn borer, Sesamia nonagrioides

Systematics and biology of Cotesia typhae sp. n. (Hymenoptera, Braconidae, Microgastrinae), a potential biological control agent against the noctuid Mediterranean corn borer, Sesamia nonagrioides

Ongoing ecological speciation in Cotesia sesamiae, a biological control agent of cereal stem borers

Lepidopteran cereal stemborers and associated natural enemies on maize and wild grass hosts in Cameroon

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