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Paul-andré Calatayud - One of the best experts on this subject based on the ideXlab platform.
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Table_1_Salivary α-Amylase of Stem Borer Hosts Determines Host Recognition and Acceptance for Oviposition by Cotesia spp. (Hymenoptera, Braconidae).DOCX
2018Co-Authors: Gladys B. Bichang'a, Jean-luc Da Lage, Kevin Sambai, Simon Mule, Laure Kaiser, Gerald Juma, Esther N. Maina, Paul-andré CalatayudAbstract:Foraging insect parasitoids use specific chemical cues to discriminate between Host and non-Host species. Several compounds have been identified in “Host location and acceptance.” However, nothing is known about the molecular variations in these compounds that could account for Host-range differences between parasitoid species. In a previous study, it was shown that during the Host-finding process, contact between the braconid Cotesia flavipes and its Host is crucial, and that α-amylase of oral secretions from the Host plays a key role for Host acceptance and oviposition by the parasitoid. The present study sought to establish whether the variations in this enzyme could explain specific Host Recognition in different Host-parasitoid associations. Different species and populations of the C. flavipes complex specialized on graminaceous lepidopteran stemborers were used. Electrophoresis of α-amylase revealed different isoforms that mediate the parasitoid's oviposition acceptance and preference for a specific Host. This discovery opens up new avenues for investigating the evolutionary processes at play in chemically-mediated Host specialization in the species-rich Cotesia genus.
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sensilla on antennae ovipositor and tarsi of the larval parasitoids cotesia sesamiae cameron 1906 and cotesia flavipes cameron 1891 hymenoptera braconidae a comparative scanning electron microscopy study
Annales De La Societe Entomologique De France, 2011Co-Authors: Meshack Obonyo, Gerard Mascarel, Johann Van Den Berg, M Chimtawi, Bruno Le Ru, Fritz Schulthess, Peter Ahuya, Jean-françois Silvain, Paul-andré CalatayudAbstract:Abstract Two braconid parasitoids of cereal stemborers in eastern Africa, Cotesia sesamiae and Cotesia flavipes, have been shown to display a similar hierarchy of behavioural events during Host Recognition and acceptance. In order to understand the mechanisms underlying Host Recognition and acceptance, the morphology of antennal sensilla on the last antennomeres, on the ovipositor, and on the fifth tarsomere and pretarsus of the prothoracic legs tarsi were studied using scanning electron microscopy followed by selective silver nitrate staining. It appeared that female C. sesamiae and C. flavipes shared the same types and distribution of sensory receptors, which enable them to detect volatiles and contact chemical stimuli from their Hosts. In both parasitoids, four types of sensilla were identified on the three terminal antennomeres: (i) non-porous sensilla trichodea likely to be involved in mechanoreception, (ii) uniporous sensilla chaetica with porous tips that have gustatory functions, (iii) multiporous...
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importance of contact chemical cues in Host Recognition and acceptance by the braconid larval endoparasitoids cotesia sesamiae and cotesia flavipes
Biological Control, 2010Co-Authors: Meshack Obonyo, Bruno Le Ru, Fritz Schulthess, Johnnie Van Den Berg, Jean-françois Silvain, Paul-andré CalatayudAbstract:The ability of the congeneric braconid parasitoids Cotesia sesamiae (Cameron) and Cotesia flavipes Cameron to discriminate between stemborer larval cues upon contact was studied using their natural Hosts, namely the noctuid Busseola fusca (Fuller) and the crambid Chilo partellus (Swinhoe), respectively, and the pyralid non-Host Eldana saccharina (Walker). When the natural Host larvae were washed in distilled water, parasitoid behavior was similar to that displayed when in contact with E. saccharina, characterized by the absence of ovipositor insertion. When washed Host or non-Host larvae were bathed with water extracts of their natural Host, the parasitoids showed a significant increase in ovipositor insertions. However, the water extracts of Host-larvae deposited on cotton wool balls did not induce ovipositor insertion in either C. sesamiae or C. flavipes. Nevertheless, the extracts enabled the parasitoids to discriminate between natural and non-Hosts as indicated by the intensive antennating of the former. For both parasitoids, frass was found to be important in short-range Host Recognition as indicated by differences in the time spent on antennating between frass sources. In addition, the regurgitants of B. fusca and C. partellus induced ovipositor insertion in C. flavipes only. These results indicated that C. sesamiae and C. flavipes used different chemical cues for acceptation and oviposition in a stemborer larva, and that B. fusca and C. partellus shared the same chemical cues to induce oviposition in C. flavipes.
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Host Recognition and acceptance behaviour in cotesia sesamiae and c flavipes hymenoptera braconidae parasitoids of gramineous stemborers in africa
European Journal of Entomology, 2010Co-Authors: Paul-andré Calatayud, Meshack Obonyo, Fritz Schulthess, Johann Van Den BergAbstract:The Host Recognition and acceptance behaviour of two braconid larval parasitoids (Cotesia sesamiae and C. flavipes) were studied using natural stemborer Hosts (i.e., the noctuid Busseola fusca for C. sesamiae, and the crambid Chilo partellus for C. flavi- pes) and a non-Host (the pyralid Eldana saccharina). A single larva was introduced into an arena together with a female parasitoid and the behaviour of the wasp recorded until it either stung the larva or for a maximum of 5 min if it did not sting the larva. There was a clear hierarchy of behavioural steps, which was similar for both parasitoid species. In the presence of suitable Host larvae, after a latency period of 16-17 s, the wasp walked rapidly drumming the surface with its antennae until it located the larva. After location and antennal examination of the Host, which lasted 60-70 s and 30 s, respectively, the parasitoid inserted its ovipositor. Stinging that resulted in successful oviposition usually lasted 5-6 s. In the presence of non-Host larvae, the latency period was between 25-70 s, and parasitoids spent significantly more time walking and antennal drumming on larvae without ovipositing. It is likely that these two parasitoid species use their antennae for Host Recognition, and both their antennae and tarsi for final acceptance of a Host for ovi- position. In both C. sesamiae and C. flavipes tactile and contact-chemoreception stimuli from the Hosts seemed to play a major role in the decision to oviposit.
Meshack Obonyo - One of the best experts on this subject based on the ideXlab platform.
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sensilla on antennae ovipositor and tarsi of the larval parasitoids cotesia sesamiae cameron 1906 and cotesia flavipes cameron 1891 hymenoptera braconidae a comparative scanning electron microscopy study
Annales De La Societe Entomologique De France, 2011Co-Authors: Meshack Obonyo, Gerard Mascarel, Johann Van Den Berg, M Chimtawi, Bruno Le Ru, Fritz Schulthess, Peter Ahuya, Jean-françois Silvain, Paul-andré CalatayudAbstract:Abstract Two braconid parasitoids of cereal stemborers in eastern Africa, Cotesia sesamiae and Cotesia flavipes, have been shown to display a similar hierarchy of behavioural events during Host Recognition and acceptance. In order to understand the mechanisms underlying Host Recognition and acceptance, the morphology of antennal sensilla on the last antennomeres, on the ovipositor, and on the fifth tarsomere and pretarsus of the prothoracic legs tarsi were studied using scanning electron microscopy followed by selective silver nitrate staining. It appeared that female C. sesamiae and C. flavipes shared the same types and distribution of sensory receptors, which enable them to detect volatiles and contact chemical stimuli from their Hosts. In both parasitoids, four types of sensilla were identified on the three terminal antennomeres: (i) non-porous sensilla trichodea likely to be involved in mechanoreception, (ii) uniporous sensilla chaetica with porous tips that have gustatory functions, (iii) multiporous...
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importance of contact chemical cues in Host Recognition and acceptance by the braconid larval endoparasitoids cotesia sesamiae and cotesia flavipes
Biological Control, 2010Co-Authors: Meshack Obonyo, Bruno Le Ru, Fritz Schulthess, Johnnie Van Den Berg, Jean-françois Silvain, Paul-andré CalatayudAbstract:The ability of the congeneric braconid parasitoids Cotesia sesamiae (Cameron) and Cotesia flavipes Cameron to discriminate between stemborer larval cues upon contact was studied using their natural Hosts, namely the noctuid Busseola fusca (Fuller) and the crambid Chilo partellus (Swinhoe), respectively, and the pyralid non-Host Eldana saccharina (Walker). When the natural Host larvae were washed in distilled water, parasitoid behavior was similar to that displayed when in contact with E. saccharina, characterized by the absence of ovipositor insertion. When washed Host or non-Host larvae were bathed with water extracts of their natural Host, the parasitoids showed a significant increase in ovipositor insertions. However, the water extracts of Host-larvae deposited on cotton wool balls did not induce ovipositor insertion in either C. sesamiae or C. flavipes. Nevertheless, the extracts enabled the parasitoids to discriminate between natural and non-Hosts as indicated by the intensive antennating of the former. For both parasitoids, frass was found to be important in short-range Host Recognition as indicated by differences in the time spent on antennating between frass sources. In addition, the regurgitants of B. fusca and C. partellus induced ovipositor insertion in C. flavipes only. These results indicated that C. sesamiae and C. flavipes used different chemical cues for acceptation and oviposition in a stemborer larva, and that B. fusca and C. partellus shared the same chemical cues to induce oviposition in C. flavipes.
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Host Recognition and acceptance behaviour in cotesia sesamiae and c flavipes hymenoptera braconidae parasitoids of gramineous stemborers in africa
European Journal of Entomology, 2010Co-Authors: Paul-andré Calatayud, Meshack Obonyo, Fritz Schulthess, Johann Van Den BergAbstract:The Host Recognition and acceptance behaviour of two braconid larval parasitoids (Cotesia sesamiae and C. flavipes) were studied using natural stemborer Hosts (i.e., the noctuid Busseola fusca for C. sesamiae, and the crambid Chilo partellus for C. flavi- pes) and a non-Host (the pyralid Eldana saccharina). A single larva was introduced into an arena together with a female parasitoid and the behaviour of the wasp recorded until it either stung the larva or for a maximum of 5 min if it did not sting the larva. There was a clear hierarchy of behavioural steps, which was similar for both parasitoid species. In the presence of suitable Host larvae, after a latency period of 16-17 s, the wasp walked rapidly drumming the surface with its antennae until it located the larva. After location and antennal examination of the Host, which lasted 60-70 s and 30 s, respectively, the parasitoid inserted its ovipositor. Stinging that resulted in successful oviposition usually lasted 5-6 s. In the presence of non-Host larvae, the latency period was between 25-70 s, and parasitoids spent significantly more time walking and antennal drumming on larvae without ovipositing. It is likely that these two parasitoid species use their antennae for Host Recognition, and both their antennae and tarsi for final acceptance of a Host for ovi- position. In both C. sesamiae and C. flavipes tactile and contact-chemoreception stimuli from the Hosts seemed to play a major role in the decision to oviposit.
Bruno Le Ru - One of the best experts on this subject based on the ideXlab platform.
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sensilla on antennae ovipositor and tarsi of the larval parasitoids cotesia sesamiae cameron 1906 and cotesia flavipes cameron 1891 hymenoptera braconidae a comparative scanning electron microscopy study
Annales De La Societe Entomologique De France, 2011Co-Authors: Meshack Obonyo, Gerard Mascarel, Johann Van Den Berg, M Chimtawi, Bruno Le Ru, Fritz Schulthess, Peter Ahuya, Jean-françois Silvain, Paul-andré CalatayudAbstract:Abstract Two braconid parasitoids of cereal stemborers in eastern Africa, Cotesia sesamiae and Cotesia flavipes, have been shown to display a similar hierarchy of behavioural events during Host Recognition and acceptance. In order to understand the mechanisms underlying Host Recognition and acceptance, the morphology of antennal sensilla on the last antennomeres, on the ovipositor, and on the fifth tarsomere and pretarsus of the prothoracic legs tarsi were studied using scanning electron microscopy followed by selective silver nitrate staining. It appeared that female C. sesamiae and C. flavipes shared the same types and distribution of sensory receptors, which enable them to detect volatiles and contact chemical stimuli from their Hosts. In both parasitoids, four types of sensilla were identified on the three terminal antennomeres: (i) non-porous sensilla trichodea likely to be involved in mechanoreception, (ii) uniporous sensilla chaetica with porous tips that have gustatory functions, (iii) multiporous...
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importance of contact chemical cues in Host Recognition and acceptance by the braconid larval endoparasitoids cotesia sesamiae and cotesia flavipes
Biological Control, 2010Co-Authors: Meshack Obonyo, Bruno Le Ru, Fritz Schulthess, Johnnie Van Den Berg, Jean-françois Silvain, Paul-andré CalatayudAbstract:The ability of the congeneric braconid parasitoids Cotesia sesamiae (Cameron) and Cotesia flavipes Cameron to discriminate between stemborer larval cues upon contact was studied using their natural Hosts, namely the noctuid Busseola fusca (Fuller) and the crambid Chilo partellus (Swinhoe), respectively, and the pyralid non-Host Eldana saccharina (Walker). When the natural Host larvae were washed in distilled water, parasitoid behavior was similar to that displayed when in contact with E. saccharina, characterized by the absence of ovipositor insertion. When washed Host or non-Host larvae were bathed with water extracts of their natural Host, the parasitoids showed a significant increase in ovipositor insertions. However, the water extracts of Host-larvae deposited on cotton wool balls did not induce ovipositor insertion in either C. sesamiae or C. flavipes. Nevertheless, the extracts enabled the parasitoids to discriminate between natural and non-Hosts as indicated by the intensive antennating of the former. For both parasitoids, frass was found to be important in short-range Host Recognition as indicated by differences in the time spent on antennating between frass sources. In addition, the regurgitants of B. fusca and C. partellus induced ovipositor insertion in C. flavipes only. These results indicated that C. sesamiae and C. flavipes used different chemical cues for acceptation and oviposition in a stemborer larva, and that B. fusca and C. partellus shared the same chemical cues to induce oviposition in C. flavipes.
Jean-françois Silvain - One of the best experts on this subject based on the ideXlab platform.
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sensilla on antennae ovipositor and tarsi of the larval parasitoids cotesia sesamiae cameron 1906 and cotesia flavipes cameron 1891 hymenoptera braconidae a comparative scanning electron microscopy study
Annales De La Societe Entomologique De France, 2011Co-Authors: Meshack Obonyo, Gerard Mascarel, Johann Van Den Berg, M Chimtawi, Bruno Le Ru, Fritz Schulthess, Peter Ahuya, Jean-françois Silvain, Paul-andré CalatayudAbstract:Abstract Two braconid parasitoids of cereal stemborers in eastern Africa, Cotesia sesamiae and Cotesia flavipes, have been shown to display a similar hierarchy of behavioural events during Host Recognition and acceptance. In order to understand the mechanisms underlying Host Recognition and acceptance, the morphology of antennal sensilla on the last antennomeres, on the ovipositor, and on the fifth tarsomere and pretarsus of the prothoracic legs tarsi were studied using scanning electron microscopy followed by selective silver nitrate staining. It appeared that female C. sesamiae and C. flavipes shared the same types and distribution of sensory receptors, which enable them to detect volatiles and contact chemical stimuli from their Hosts. In both parasitoids, four types of sensilla were identified on the three terminal antennomeres: (i) non-porous sensilla trichodea likely to be involved in mechanoreception, (ii) uniporous sensilla chaetica with porous tips that have gustatory functions, (iii) multiporous...
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importance of contact chemical cues in Host Recognition and acceptance by the braconid larval endoparasitoids cotesia sesamiae and cotesia flavipes
Biological Control, 2010Co-Authors: Meshack Obonyo, Bruno Le Ru, Fritz Schulthess, Johnnie Van Den Berg, Jean-françois Silvain, Paul-andré CalatayudAbstract:The ability of the congeneric braconid parasitoids Cotesia sesamiae (Cameron) and Cotesia flavipes Cameron to discriminate between stemborer larval cues upon contact was studied using their natural Hosts, namely the noctuid Busseola fusca (Fuller) and the crambid Chilo partellus (Swinhoe), respectively, and the pyralid non-Host Eldana saccharina (Walker). When the natural Host larvae were washed in distilled water, parasitoid behavior was similar to that displayed when in contact with E. saccharina, characterized by the absence of ovipositor insertion. When washed Host or non-Host larvae were bathed with water extracts of their natural Host, the parasitoids showed a significant increase in ovipositor insertions. However, the water extracts of Host-larvae deposited on cotton wool balls did not induce ovipositor insertion in either C. sesamiae or C. flavipes. Nevertheless, the extracts enabled the parasitoids to discriminate between natural and non-Hosts as indicated by the intensive antennating of the former. For both parasitoids, frass was found to be important in short-range Host Recognition as indicated by differences in the time spent on antennating between frass sources. In addition, the regurgitants of B. fusca and C. partellus induced ovipositor insertion in C. flavipes only. These results indicated that C. sesamiae and C. flavipes used different chemical cues for acceptation and oviposition in a stemborer larva, and that B. fusca and C. partellus shared the same chemical cues to induce oviposition in C. flavipes.
Fritz Schulthess - One of the best experts on this subject based on the ideXlab platform.
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sensilla on antennae ovipositor and tarsi of the larval parasitoids cotesia sesamiae cameron 1906 and cotesia flavipes cameron 1891 hymenoptera braconidae a comparative scanning electron microscopy study
Annales De La Societe Entomologique De France, 2011Co-Authors: Meshack Obonyo, Gerard Mascarel, Johann Van Den Berg, M Chimtawi, Bruno Le Ru, Fritz Schulthess, Peter Ahuya, Jean-françois Silvain, Paul-andré CalatayudAbstract:Abstract Two braconid parasitoids of cereal stemborers in eastern Africa, Cotesia sesamiae and Cotesia flavipes, have been shown to display a similar hierarchy of behavioural events during Host Recognition and acceptance. In order to understand the mechanisms underlying Host Recognition and acceptance, the morphology of antennal sensilla on the last antennomeres, on the ovipositor, and on the fifth tarsomere and pretarsus of the prothoracic legs tarsi were studied using scanning electron microscopy followed by selective silver nitrate staining. It appeared that female C. sesamiae and C. flavipes shared the same types and distribution of sensory receptors, which enable them to detect volatiles and contact chemical stimuli from their Hosts. In both parasitoids, four types of sensilla were identified on the three terminal antennomeres: (i) non-porous sensilla trichodea likely to be involved in mechanoreception, (ii) uniporous sensilla chaetica with porous tips that have gustatory functions, (iii) multiporous...
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importance of contact chemical cues in Host Recognition and acceptance by the braconid larval endoparasitoids cotesia sesamiae and cotesia flavipes
Biological Control, 2010Co-Authors: Meshack Obonyo, Bruno Le Ru, Fritz Schulthess, Johnnie Van Den Berg, Jean-françois Silvain, Paul-andré CalatayudAbstract:The ability of the congeneric braconid parasitoids Cotesia sesamiae (Cameron) and Cotesia flavipes Cameron to discriminate between stemborer larval cues upon contact was studied using their natural Hosts, namely the noctuid Busseola fusca (Fuller) and the crambid Chilo partellus (Swinhoe), respectively, and the pyralid non-Host Eldana saccharina (Walker). When the natural Host larvae were washed in distilled water, parasitoid behavior was similar to that displayed when in contact with E. saccharina, characterized by the absence of ovipositor insertion. When washed Host or non-Host larvae were bathed with water extracts of their natural Host, the parasitoids showed a significant increase in ovipositor insertions. However, the water extracts of Host-larvae deposited on cotton wool balls did not induce ovipositor insertion in either C. sesamiae or C. flavipes. Nevertheless, the extracts enabled the parasitoids to discriminate between natural and non-Hosts as indicated by the intensive antennating of the former. For both parasitoids, frass was found to be important in short-range Host Recognition as indicated by differences in the time spent on antennating between frass sources. In addition, the regurgitants of B. fusca and C. partellus induced ovipositor insertion in C. flavipes only. These results indicated that C. sesamiae and C. flavipes used different chemical cues for acceptation and oviposition in a stemborer larva, and that B. fusca and C. partellus shared the same chemical cues to induce oviposition in C. flavipes.
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Host Recognition and acceptance behaviour in cotesia sesamiae and c flavipes hymenoptera braconidae parasitoids of gramineous stemborers in africa
European Journal of Entomology, 2010Co-Authors: Paul-andré Calatayud, Meshack Obonyo, Fritz Schulthess, Johann Van Den BergAbstract:The Host Recognition and acceptance behaviour of two braconid larval parasitoids (Cotesia sesamiae and C. flavipes) were studied using natural stemborer Hosts (i.e., the noctuid Busseola fusca for C. sesamiae, and the crambid Chilo partellus for C. flavi- pes) and a non-Host (the pyralid Eldana saccharina). A single larva was introduced into an arena together with a female parasitoid and the behaviour of the wasp recorded until it either stung the larva or for a maximum of 5 min if it did not sting the larva. There was a clear hierarchy of behavioural steps, which was similar for both parasitoid species. In the presence of suitable Host larvae, after a latency period of 16-17 s, the wasp walked rapidly drumming the surface with its antennae until it located the larva. After location and antennal examination of the Host, which lasted 60-70 s and 30 s, respectively, the parasitoid inserted its ovipositor. Stinging that resulted in successful oviposition usually lasted 5-6 s. In the presence of non-Host larvae, the latency period was between 25-70 s, and parasitoids spent significantly more time walking and antennal drumming on larvae without ovipositing. It is likely that these two parasitoid species use their antennae for Host Recognition, and both their antennae and tarsi for final acceptance of a Host for ovi- position. In both C. sesamiae and C. flavipes tactile and contact-chemoreception stimuli from the Hosts seemed to play a major role in the decision to oviposit.