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Tom C. Cameron - One of the best experts on this subject based on the ideXlab platform.

  • longevity : effects on fecundity and Xylocoris flavipes pirate bug, Multiple mating in the traumatically inseminating Warehouse
    2014
    Co-Authors: Amy Backhouse, Steven M. Sait, Tom C. Cameron
    Abstract:

    Optimal mating frequencies differ between sexesas a consequence of the sexual differentiation ofreproductive costs per mating, where mating isnormally more costly to females than males. Inmating systems where sexual reproduction iscostly to females, sexual conflict may cause bothdirect (i.e. by reducing female fecundity or caus-ing mortality) and indirect (i.e. increased risk ofmortality, reduced offspring viability) reductionsin lifetime reproductive success of females, whichhave individual and population consequences. Weinvestigated the direct and indirect costs ofmultiple mating in a traumatically inseminating(TI) predatory Warehouse pirate bug, Xylocorisflavipes (Reuter) (Hemiptera: Anthocoridae),where the male penetrates the female’s abdomenduring copulation. This study aimed to quantifythe effects of TI on female fecundity, egg viability,the lifetime fecundity schedule, longevity and preyconsumption in this cosmopolitan biocontrolagent. We found no difference in the total repro-ductive output between mating treatments interms of total eggs laid or offspring viability, butthere were significant differences found in dailyfecundity schedules and adult longevity. In termsof lifetime reproduction, female Warehousepirate bugs appear to be adapted to compensatefor the costs of TI mating to their longevity.Keywords: sexual conflict; traumatic insemination;adaptation; Xylocoris flavipes; pirate bugs1. INTRODUCTIONGenerally, mating carries costs for both males andfemales [1]. However, theory predicts that malesshould have higher optimum mating rates thanfemales, as the cost of each mating is lower than forthe females they fertilizes [2,3]. Consequently, malesshould seek higher mating frequencies, and this canlead to sexual conflict [4,5]. Some invertebratemating systems display a sexual conflict known astraumatic insemination (hereafter TI; [6]), wheremales use external genitalia to pierce and penetratethe female abdominal wall and ejaculate into theabdominal cavity. Here, males and females are unlikelyto share an optimal reproductive outcome, but insteadshow antagonistic strategies [7].In a TI mating system, the reproductive tract of thefemale is fully functional, but during mating, the maleuses a specialized hypodermic penis (a coupling of theaedeagus and left paramere as in the Cimicidae;figure 1a) to penetrate the female’s abdomen intowhich the sperm is deposited. This behaviour isobserved across many invertebrate orders, but iswidely practiced among the Heteroptera (true bugs)and the infraorder Cimicomorpha, whereas it hasevolved at least three times [8] and is most well-knownin bed bugs (Cimicidae) [9].The significant work on the costs of TI hasconsidered only those species of blood-sucking (para-sitic) systems of the Cimicomorpha [10–12], whereasmost species that display TI are generalist predators.Costs associated with a TI mating system for suchspecies are more likely to be affected by factors suchas adult densities and prey availability. Here, westudy another Cimicomorphan, the Warehouse piratebug Xylocoris flavipes (Reuter) (Hemiptera: Anthocor-idae) that performs the extragenital form of TI.Warehouse pirate bug males use a scythe-like penis topenetrate the female on the surface of her abdomen([13]; figure 1a and electronic supplementary material,appendix). Female X. flavipes are known to have aspermalege [6], which is thought to be a counter-adaptation to the risks of abdominal TI mating [11].The function of the spermalege is to reduce the likeli-hood of infection being introduced to females via thepiercing of their body wall with a potentially unhygie-nic male penis. Scanning electron microscopy revealsfluid seeping from the surface of the abdomen platewhere we observed mating scars (figure 1b). Unlikein bed bugs, there is no single fixed position of entryand penetration can occur along much of the lengthof the join between the TI-II and T-III segment onthe upper right dorsal surface of the abdomen [13].This study determined the costs incurred duringsingle versus multiple mating as a representation ofvarying mating frequencies between the sexes of theWarehouse pirate bug. We measured the effects of TImating on longevity, fecundity, fecundity schedules,offspring viability and prey consumption, an assessmentof post-copulatory resource requirements, on matedfemales in comparison with virgin females and males.2. MATERIAL AND METHODS

  • Multiple mating in the traumatically inseminating Warehouse pirate bug, Xylocoris flavipes: effects on fecundity and longevity.
    Biology letters, 2012
    Co-Authors: Amy Backhouse, Steven M. Sait, Tom C. Cameron
    Abstract:

    Optimal mating frequencies differ between sexes as a consequence of the sexual differentiation of reproductive costs per mating, where mating is normally more costly to females than males. In mating systems where sexual reproduction is costly to females, sexual conflict may cause both direct (i.e. by reducing female fecundity or causing mortality) and indirect (i.e. increased risk of mortality, reduced offspring viability) reductions in lifetime reproductive success of females, which have individual and population consequences. We investigated the direct and indirect costs of multiple mating in a traumatically inseminating (TI) predatory Warehouse pirate bug, Xylocoris flavipes (Reuter) (Hemiptera: Anthocoridae), where the male penetrates the female's abdomen during copulation. This study aimed to quantify the effects of TI on female fecundity, egg viability, the lifetime fecundity schedule, longevity and prey consumption in this cosmopolitan biocontrol agent. We found no difference in the total reproductive output between mating treatments in terms of total eggs laid or offspring viability, but there were significant differences found in daily fecundity schedules and adult longevity. In terms of lifetime reproduction, female Warehouse pirate bugs appear to be adapted to compensate for the costs of TI mating to their longevity.

Amy Backhouse - One of the best experts on this subject based on the ideXlab platform.

  • longevity : effects on fecundity and Xylocoris flavipes pirate bug, Multiple mating in the traumatically inseminating Warehouse
    2014
    Co-Authors: Amy Backhouse, Steven M. Sait, Tom C. Cameron
    Abstract:

    Optimal mating frequencies differ between sexesas a consequence of the sexual differentiation ofreproductive costs per mating, where mating isnormally more costly to females than males. Inmating systems where sexual reproduction iscostly to females, sexual conflict may cause bothdirect (i.e. by reducing female fecundity or caus-ing mortality) and indirect (i.e. increased risk ofmortality, reduced offspring viability) reductionsin lifetime reproductive success of females, whichhave individual and population consequences. Weinvestigated the direct and indirect costs ofmultiple mating in a traumatically inseminating(TI) predatory Warehouse pirate bug, Xylocorisflavipes (Reuter) (Hemiptera: Anthocoridae),where the male penetrates the female’s abdomenduring copulation. This study aimed to quantifythe effects of TI on female fecundity, egg viability,the lifetime fecundity schedule, longevity and preyconsumption in this cosmopolitan biocontrolagent. We found no difference in the total repro-ductive output between mating treatments interms of total eggs laid or offspring viability, butthere were significant differences found in dailyfecundity schedules and adult longevity. In termsof lifetime reproduction, female Warehousepirate bugs appear to be adapted to compensatefor the costs of TI mating to their longevity.Keywords: sexual conflict; traumatic insemination;adaptation; Xylocoris flavipes; pirate bugs1. INTRODUCTIONGenerally, mating carries costs for both males andfemales [1]. However, theory predicts that malesshould have higher optimum mating rates thanfemales, as the cost of each mating is lower than forthe females they fertilizes [2,3]. Consequently, malesshould seek higher mating frequencies, and this canlead to sexual conflict [4,5]. Some invertebratemating systems display a sexual conflict known astraumatic insemination (hereafter TI; [6]), wheremales use external genitalia to pierce and penetratethe female abdominal wall and ejaculate into theabdominal cavity. Here, males and females are unlikelyto share an optimal reproductive outcome, but insteadshow antagonistic strategies [7].In a TI mating system, the reproductive tract of thefemale is fully functional, but during mating, the maleuses a specialized hypodermic penis (a coupling of theaedeagus and left paramere as in the Cimicidae;figure 1a) to penetrate the female’s abdomen intowhich the sperm is deposited. This behaviour isobserved across many invertebrate orders, but iswidely practiced among the Heteroptera (true bugs)and the infraorder Cimicomorpha, whereas it hasevolved at least three times [8] and is most well-knownin bed bugs (Cimicidae) [9].The significant work on the costs of TI hasconsidered only those species of blood-sucking (para-sitic) systems of the Cimicomorpha [10–12], whereasmost species that display TI are generalist predators.Costs associated with a TI mating system for suchspecies are more likely to be affected by factors suchas adult densities and prey availability. Here, westudy another Cimicomorphan, the Warehouse piratebug Xylocoris flavipes (Reuter) (Hemiptera: Anthocor-idae) that performs the extragenital form of TI.Warehouse pirate bug males use a scythe-like penis topenetrate the female on the surface of her abdomen([13]; figure 1a and electronic supplementary material,appendix). Female X. flavipes are known to have aspermalege [6], which is thought to be a counter-adaptation to the risks of abdominal TI mating [11].The function of the spermalege is to reduce the likeli-hood of infection being introduced to females via thepiercing of their body wall with a potentially unhygie-nic male penis. Scanning electron microscopy revealsfluid seeping from the surface of the abdomen platewhere we observed mating scars (figure 1b). Unlikein bed bugs, there is no single fixed position of entryand penetration can occur along much of the lengthof the join between the TI-II and T-III segment onthe upper right dorsal surface of the abdomen [13].This study determined the costs incurred duringsingle versus multiple mating as a representation ofvarying mating frequencies between the sexes of theWarehouse pirate bug. We measured the effects of TImating on longevity, fecundity, fecundity schedules,offspring viability and prey consumption, an assessmentof post-copulatory resource requirements, on matedfemales in comparison with virgin females and males.2. MATERIAL AND METHODS

  • Multiple mating in the traumatically inseminating Warehouse pirate bug, Xylocoris flavipes: effects on fecundity and longevity.
    Biology letters, 2012
    Co-Authors: Amy Backhouse, Steven M. Sait, Tom C. Cameron
    Abstract:

    Optimal mating frequencies differ between sexes as a consequence of the sexual differentiation of reproductive costs per mating, where mating is normally more costly to females than males. In mating systems where sexual reproduction is costly to females, sexual conflict may cause both direct (i.e. by reducing female fecundity or causing mortality) and indirect (i.e. increased risk of mortality, reduced offspring viability) reductions in lifetime reproductive success of females, which have individual and population consequences. We investigated the direct and indirect costs of multiple mating in a traumatically inseminating (TI) predatory Warehouse pirate bug, Xylocoris flavipes (Reuter) (Hemiptera: Anthocoridae), where the male penetrates the female's abdomen during copulation. This study aimed to quantify the effects of TI on female fecundity, egg viability, the lifetime fecundity schedule, longevity and prey consumption in this cosmopolitan biocontrol agent. We found no difference in the total reproductive output between mating treatments in terms of total eggs laid or offspring viability, but there were significant differences found in daily fecundity schedules and adult longevity. In terms of lifetime reproduction, female Warehouse pirate bugs appear to be adapted to compensate for the costs of TI mating to their longevity.

Steven M. Sait - One of the best experts on this subject based on the ideXlab platform.

  • longevity : effects on fecundity and Xylocoris flavipes pirate bug, Multiple mating in the traumatically inseminating Warehouse
    2014
    Co-Authors: Amy Backhouse, Steven M. Sait, Tom C. Cameron
    Abstract:

    Optimal mating frequencies differ between sexesas a consequence of the sexual differentiation ofreproductive costs per mating, where mating isnormally more costly to females than males. Inmating systems where sexual reproduction iscostly to females, sexual conflict may cause bothdirect (i.e. by reducing female fecundity or caus-ing mortality) and indirect (i.e. increased risk ofmortality, reduced offspring viability) reductionsin lifetime reproductive success of females, whichhave individual and population consequences. Weinvestigated the direct and indirect costs ofmultiple mating in a traumatically inseminating(TI) predatory Warehouse pirate bug, Xylocorisflavipes (Reuter) (Hemiptera: Anthocoridae),where the male penetrates the female’s abdomenduring copulation. This study aimed to quantifythe effects of TI on female fecundity, egg viability,the lifetime fecundity schedule, longevity and preyconsumption in this cosmopolitan biocontrolagent. We found no difference in the total repro-ductive output between mating treatments interms of total eggs laid or offspring viability, butthere were significant differences found in dailyfecundity schedules and adult longevity. In termsof lifetime reproduction, female Warehousepirate bugs appear to be adapted to compensatefor the costs of TI mating to their longevity.Keywords: sexual conflict; traumatic insemination;adaptation; Xylocoris flavipes; pirate bugs1. INTRODUCTIONGenerally, mating carries costs for both males andfemales [1]. However, theory predicts that malesshould have higher optimum mating rates thanfemales, as the cost of each mating is lower than forthe females they fertilizes [2,3]. Consequently, malesshould seek higher mating frequencies, and this canlead to sexual conflict [4,5]. Some invertebratemating systems display a sexual conflict known astraumatic insemination (hereafter TI; [6]), wheremales use external genitalia to pierce and penetratethe female abdominal wall and ejaculate into theabdominal cavity. Here, males and females are unlikelyto share an optimal reproductive outcome, but insteadshow antagonistic strategies [7].In a TI mating system, the reproductive tract of thefemale is fully functional, but during mating, the maleuses a specialized hypodermic penis (a coupling of theaedeagus and left paramere as in the Cimicidae;figure 1a) to penetrate the female’s abdomen intowhich the sperm is deposited. This behaviour isobserved across many invertebrate orders, but iswidely practiced among the Heteroptera (true bugs)and the infraorder Cimicomorpha, whereas it hasevolved at least three times [8] and is most well-knownin bed bugs (Cimicidae) [9].The significant work on the costs of TI hasconsidered only those species of blood-sucking (para-sitic) systems of the Cimicomorpha [10–12], whereasmost species that display TI are generalist predators.Costs associated with a TI mating system for suchspecies are more likely to be affected by factors suchas adult densities and prey availability. Here, westudy another Cimicomorphan, the Warehouse piratebug Xylocoris flavipes (Reuter) (Hemiptera: Anthocor-idae) that performs the extragenital form of TI.Warehouse pirate bug males use a scythe-like penis topenetrate the female on the surface of her abdomen([13]; figure 1a and electronic supplementary material,appendix). Female X. flavipes are known to have aspermalege [6], which is thought to be a counter-adaptation to the risks of abdominal TI mating [11].The function of the spermalege is to reduce the likeli-hood of infection being introduced to females via thepiercing of their body wall with a potentially unhygie-nic male penis. Scanning electron microscopy revealsfluid seeping from the surface of the abdomen platewhere we observed mating scars (figure 1b). Unlikein bed bugs, there is no single fixed position of entryand penetration can occur along much of the lengthof the join between the TI-II and T-III segment onthe upper right dorsal surface of the abdomen [13].This study determined the costs incurred duringsingle versus multiple mating as a representation ofvarying mating frequencies between the sexes of theWarehouse pirate bug. We measured the effects of TImating on longevity, fecundity, fecundity schedules,offspring viability and prey consumption, an assessmentof post-copulatory resource requirements, on matedfemales in comparison with virgin females and males.2. MATERIAL AND METHODS

  • Multiple mating in the traumatically inseminating Warehouse pirate bug, Xylocoris flavipes: effects on fecundity and longevity.
    Biology letters, 2012
    Co-Authors: Amy Backhouse, Steven M. Sait, Tom C. Cameron
    Abstract:

    Optimal mating frequencies differ between sexes as a consequence of the sexual differentiation of reproductive costs per mating, where mating is normally more costly to females than males. In mating systems where sexual reproduction is costly to females, sexual conflict may cause both direct (i.e. by reducing female fecundity or causing mortality) and indirect (i.e. increased risk of mortality, reduced offspring viability) reductions in lifetime reproductive success of females, which have individual and population consequences. We investigated the direct and indirect costs of multiple mating in a traumatically inseminating (TI) predatory Warehouse pirate bug, Xylocoris flavipes (Reuter) (Hemiptera: Anthocoridae), where the male penetrates the female's abdomen during copulation. This study aimed to quantify the effects of TI on female fecundity, egg viability, the lifetime fecundity schedule, longevity and prey consumption in this cosmopolitan biocontrol agent. We found no difference in the total reproductive output between mating treatments in terms of total eggs laid or offspring viability, but there were significant differences found in daily fecundity schedules and adult longevity. In terms of lifetime reproduction, female Warehouse pirate bugs appear to be adapted to compensate for the costs of TI mating to their longevity.

  • Multiple mating in the traumatically inseminating Warehouse pirate bug, Xylocoris flavipes: Effects on fecundity and longevity
    'The Royal Society', 2012
    Co-Authors: Backhouse A, Steven M. Sait, Tc Cameron
    Abstract:

    Optimal mating frequencies differ between sexes as a consequence of the sexual differentiation of reproductive costs per mating, where mating is normally more costly to females than males. In mating systems where sexual reproduction is costly to females, sexual conflict may cause both direct (i.e. by reducing female fecundity or causing mortality) and indirect (i.e. increased risk of mortality, reduced offspring viability) reductions in lifetime reproductive success of females, which have individual and population consequences. We investigated the direct and indirect costs of multiple mating in a traumatically inseminating (TI) predatory Warehouse pirate bug, Xylocoris flavipes (Reuter) (Hemiptera: Anthocoridae), where the male penetrates the female's abdomen during copulation. This study aimed to quantify the effects of TI on female fecundity, egg viability, the lifetime fecundity schedule, longevity and prey consumption in this cosmopolitan biocontrol agent. We found no difference in the total reproductive output between mating treatments in terms of total eggs laid or offspring viability, but there were significant differences found in daily fecundity schedules and adult longevity. In terms of lifetime reproduction, female Warehouse pirate bugs appear to be adapted to compensate for the costs of TI mating to their longevity. © 2011 The Royal Society

S Parween - One of the best experts on this subject based on the ideXlab platform.

  • Developmental parameters of Xylochoris flavipes (Reuter) (Hemiptera: Anthocoridae) fed on life-stages of Rhyzopertha dominica (f.)
    Journal of Bio-Science, 2019
    Co-Authors: Ac Sarker, W Islam, S Parween
    Abstract:

    The hemipteran predator, Xylocoris flavipes (Reuter) predates the eggs, larvae and pupae of Rhyzopertha dominica (F.) in storage condition and checks their population in considerable level. The nymphs of 1st up to 5th instar and adults of X. flavipes were found efficient to survive on eggs, larvae of 1st up to 4th instar and pupae of R. dominica. The mean duration of developmental period through five nymphal instars on eggs, larvae of 1st up to 4th instars and pupae were 18 ± 1.00, 20 ± 0.58, 16 ± 2.00, 14 ± 1.15, 12 ± 1.15 and 13 ± 0.58 days in R. dominica. The adult female X. flavipes survived longer than the male. Average consumption rates of each nymph of 1st up to 5th instar and adult stage of X. flavipes were found highest on eggs, 1st and 2nd instar larvae but lowest on 4th instar larvae and pupae. The female predator always consumed more individuals than the male. Average survivability rates of nymphs of 1st up to 5th instar and adults were maximum on 1st and 2nd instar larvae and minimum on 4th instar larvae and pupae. The size of the female predator was found larger than the male at all the stages. Based on the ratio 1:1, sex ratio was the best (male and female almost equal in number) on 1st and 2nd instar larvae comparatively than that of other stages. Developmental period, adult longevity, consumption rate, survivability rate, size and sex ratio of X. flavipes were found always significant (p<0.001) in different life stages of R. dominica. This study reveals that mass culture of X. flavipes can be established on R. dominica in the laboratory to get easy and abundant supply of the bug as an agent of biological control. J. bio-sci. 27: 11-21, 2019

  • Influence of Humidity and Tribolium Beetle Food Souce on the Life History Characteristics of Predator, Xylocoris flavipes (Hemiptera: Anthocoridae);
    Tropical Agricultural Research and Extension, 2013
    Co-Authors: S R Saha, W Islam, S Parween
    Abstract:

    Life history characteristics of the predator, Xylocoris flavipes reared under four regimes of RH (30, 50, 70 and 90%) on two hosts, Tribolium castaneum and T. confusum fed on three artificial diets, were studied. There were significant effects (P Tropical Agricultural Research and Extension 15(1): 2012: page 8-13 DOI: http://dx.doi.org/10.4038/tare.v15i1.5237

  • INFLUENCE OF TEMPERATURE ON LIFE HISTORY CHARACTERISTICS OF Xylocoris flavipes REARED ON ARTIFICIAL DIETS
    2013
    Co-Authors: S R Saha, W Islam, S Parween
    Abstract:

    Xylocoris flavipes (Reuter) was reared at five constant temperatures castaneum (Herbst) and T. confusum were investigated. There was significant difference noticed in the mean oviposition period of feeding on two hosts (P

  • influence of temperature on life history characteristics of Xylocoris flavipes reared on artificial diets
    2013
    Co-Authors: S R Saha, W Islam, S Parween
    Abstract:

    Xylocoris flavipes (Reuter) was reared at five constant temperatures castaneum (Herbst) and T. confusum were investigated. There was significant difference noticed in the mean oviposition period of feeding on two hosts (P<0.001, T. castaneum of the female X. flavipes reared on agar 30°C but minimum was 3.87±0.17 and 3.67±0.16 days reared only on flour. Mean number of eggs laid/female on T. castaneum reared on the sam 8.80±0.17 at 35°C. No eggs were laid at 15°C. When the maximum and minimum hatchability of eggs of 7.80±0.14 days at 25 and 35°C respectively. Highly significant temperature and development time. The minimum percentage mortality of immature stages of recorded on both the hosts reared o progeny production of the predator differed significantly (P<0.001, confusum ). Both hosts when reared on agar+flour, pro geny/female (28.73 and 28.60) at 20

W Islam - One of the best experts on this subject based on the ideXlab platform.

  • Developmental parameters of Xylochoris flavipes (Reuter) (Hemiptera: Anthocoridae) fed on life-stages of Rhyzopertha dominica (f.)
    Journal of Bio-Science, 2019
    Co-Authors: Ac Sarker, W Islam, S Parween
    Abstract:

    The hemipteran predator, Xylocoris flavipes (Reuter) predates the eggs, larvae and pupae of Rhyzopertha dominica (F.) in storage condition and checks their population in considerable level. The nymphs of 1st up to 5th instar and adults of X. flavipes were found efficient to survive on eggs, larvae of 1st up to 4th instar and pupae of R. dominica. The mean duration of developmental period through five nymphal instars on eggs, larvae of 1st up to 4th instars and pupae were 18 ± 1.00, 20 ± 0.58, 16 ± 2.00, 14 ± 1.15, 12 ± 1.15 and 13 ± 0.58 days in R. dominica. The adult female X. flavipes survived longer than the male. Average consumption rates of each nymph of 1st up to 5th instar and adult stage of X. flavipes were found highest on eggs, 1st and 2nd instar larvae but lowest on 4th instar larvae and pupae. The female predator always consumed more individuals than the male. Average survivability rates of nymphs of 1st up to 5th instar and adults were maximum on 1st and 2nd instar larvae and minimum on 4th instar larvae and pupae. The size of the female predator was found larger than the male at all the stages. Based on the ratio 1:1, sex ratio was the best (male and female almost equal in number) on 1st and 2nd instar larvae comparatively than that of other stages. Developmental period, adult longevity, consumption rate, survivability rate, size and sex ratio of X. flavipes were found always significant (p<0.001) in different life stages of R. dominica. This study reveals that mass culture of X. flavipes can be established on R. dominica in the laboratory to get easy and abundant supply of the bug as an agent of biological control. J. bio-sci. 27: 11-21, 2019

  • Influence of Humidity and Tribolium Beetle Food Souce on the Life History Characteristics of Predator, Xylocoris flavipes (Hemiptera: Anthocoridae);
    Tropical Agricultural Research and Extension, 2013
    Co-Authors: S R Saha, W Islam, S Parween
    Abstract:

    Life history characteristics of the predator, Xylocoris flavipes reared under four regimes of RH (30, 50, 70 and 90%) on two hosts, Tribolium castaneum and T. confusum fed on three artificial diets, were studied. There were significant effects (P Tropical Agricultural Research and Extension 15(1): 2012: page 8-13 DOI: http://dx.doi.org/10.4038/tare.v15i1.5237

  • INFLUENCE OF TEMPERATURE ON LIFE HISTORY CHARACTERISTICS OF Xylocoris flavipes REARED ON ARTIFICIAL DIETS
    2013
    Co-Authors: S R Saha, W Islam, S Parween
    Abstract:

    Xylocoris flavipes (Reuter) was reared at five constant temperatures castaneum (Herbst) and T. confusum were investigated. There was significant difference noticed in the mean oviposition period of feeding on two hosts (P

  • influence of temperature on life history characteristics of Xylocoris flavipes reared on artificial diets
    2013
    Co-Authors: S R Saha, W Islam, S Parween
    Abstract:

    Xylocoris flavipes (Reuter) was reared at five constant temperatures castaneum (Herbst) and T. confusum were investigated. There was significant difference noticed in the mean oviposition period of feeding on two hosts (P<0.001, T. castaneum of the female X. flavipes reared on agar 30°C but minimum was 3.87±0.17 and 3.67±0.16 days reared only on flour. Mean number of eggs laid/female on T. castaneum reared on the sam 8.80±0.17 at 35°C. No eggs were laid at 15°C. When the maximum and minimum hatchability of eggs of 7.80±0.14 days at 25 and 35°C respectively. Highly significant temperature and development time. The minimum percentage mortality of immature stages of recorded on both the hosts reared o progeny production of the predator differed significantly (P<0.001, confusum ). Both hosts when reared on agar+flour, pro geny/female (28.73 and 28.60) at 20

  • Suppression of Population of Tribolium castaneum by IGRS in Presence of A Predator, Xylocoris flavipes
    Tropical Agricultural Research and Extension, 2011
    Co-Authors: Jannatul Ferdous, W Islam, Selina Parween
    Abstract:

    Insect growth regulators (IGRs), triflumuron at concentrations of 0.001, 0.05 and 0.1ppm, and diflubenzuron at concentrations of 0.005, 0.05 and 0.01ppm in presence of 2-, 4- and 8 pairs of a predator Xylocoris flavipes Reuter, significantly(p Tribolium castaneum (Herbst) in 60 days exposure period. The PRC values ranged from 55.3 (0.005ppm of diflubenzuron with 2 pairs of X. flavipes ) to 84.3 (0.1ppm of triflumuron with 8 pairs of X. flavipes ). IGRs have reduced the predator’s population up to maximum as 56.6% compared to the control at 0.1ppm of triflumuron when 2 pairs of predators were introduced during the same exposure time. Keywords: T. castaneum ; X. flavipes ; Predator; Insect Growth Regulator; Triflumuron; Diflubenzuron DOI: http://dx.doi.org/10.4038/tare.v13i2.3134 Tropical Agricultural Research and Extension 13(2) 2010 pp.25-28