Biotic Potential

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Alexandre Specht - One of the best experts on this subject based on the ideXlab platform.

  • Biotic Potential and reproductive parameters of Spodoptera eridania (Stoll) (Lepidoptera, Noctuidae) in the laboratory
    Revista Brasileira de Entomologia, 2020
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, Daniel Ricardo Sosa-gómez, Vânia Ferreira Roque-specht, Neiva Monteiro De Barros
    Abstract:

    Biotic Potential and reprodutcive parameters of Spodoptera eridania (Stoll) (Lepidoptera, Noctuidae) in the laboratory: This study aimed to evaluate the Biotic Potential and reproductive parameters of Spodoptera eridania (Stoll, 1782) under controlled conditions (25 ± 1ºC, 70 ± 10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity and fertility of 15 couples was evaluated. The longevity of females (10.80 days) was not significantly higher than those of males (9.27 days). The mean durations of the pre, post and oviposition periods were 2.067, 0.600 and 8.133 days, respectively. The mean fecundity per female was 1,398 eggs and the mean fertility was 1,367.50 larvae. On average, females copulated 1.133 times. A strong positive correlation was observed between the number of mating and fecundity (r = 0.881, P

  • Biotic Potential and reproductive parameters of spodoptera frugiperda j e smith 1797 lepidoptera noctuidae
    The Journal of Agricultural Science, 2019
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, D R Sosagomez, Vânia F Roquespecht, J V Malaquias, Silvana Vieira De Paulamoraes, Julie A Peterson, Thomas E Hunt
    Abstract:

    The fall armyworm, Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae), a native to the Americas and recently reported in Africa, Germany, the Netherlands and India, is a significant pest of many crop species. Although a widespread and important pest, information on its biology and development are incomplete and require detailed study. In this study, the Biotic Potential and reproductive parameters of S. frugiperda were evaluated under controlled conditions (25±1 °C, 70±10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity, and fertility of 30 pairs were evaluated. The longevity of females (10.87 days) was not significantly different from that of males (10.90 days). The mean durations of the pre-, post- and oviposition periods were 2.63, 0.53 and 7.70 days, respectively. The mean fecundity was 2,370.66 eggs per female and mean fertility was 2,309.03 larvae per female. On average, a female copulated 1.6 times. The Biotic Potential of S. frugiperda was estimated at 2.086 × 1029 individuals/female/year. The net reproductive rate (Ro) was 1,079.73 times per generation and the mean generation time (T) was 32.00 days. The intrinsic rate of increase (rm) was 0.22, with a finite rate of increase (λ) of 1.24 per day. This study evaluates and describes the biological parameters of S. frugiperda with special emphasis on its Biotic Potential and reproductive parameters. This information will improve the development of integrated pest management (IPM) and insect resistance management (IRM) for this species.

  • Biotic Potential and reproductive parameters of spodoptera cosmioides walker lepidoptera noctuidae in the laboratory
    Brazilian Journal of Biology, 2019
    Co-Authors: Alexandre Specht, Vânia F Roquespecht
    Abstract:

    : In this study we evaluate the Biotic Potential and reproductive parameters of Spodoptera cosmioides (Walker, 1858) under controlled conditions (25 ± 1 °C, 70 ± 10% RH and 14 hour photophase). Females, on average, (14.433 days) did not live significantly longer than their male counterparts (13.100 days). The mean durations of the pre-oviposition, oviposition and post-oviposition periods were 2.767, 10.600 and 1.067 days, respectively. The mean fecundity of females was 5,073.533 eggs and the mean fertility was 5,021.027 larvae. On average, females copulated 1.167 times. Fecundity was positively correlated with the number of copulations (r = 0.583, P <0.001). The number of copulations, however, was negatively correlated whit the duration of the pre-oviposition (r = -0.560, P = 0.007) and oviposition (r = -0.479, P = 0.048) periods, and overall longevity (r = -0.512, P = 0.031). The Biotic Potential was estimated at 6.547 x 1021 individuals/female/year. The net reproductive rate (Ro) was 2,193.722 times per generation and the mean generation time (T) was 46.407 days. The intrinsic rate of increase (rm) was 0.166, with a finite rate of increase (λ) of 1.180, per week.

  • Biotic Potential and life tables of chrysodeixis includens lepidoptera noctuidae rachiplusia nu and trichoplusia ni on soybean and forage turnip
    Journal of Insect Science, 2019
    Co-Authors: Alexandre Specht, D R Sosagomez, Vânia F Roquespecht, Eduardo Valduga, Felipe Gonzatti, Sabrina Maurer Schuh, Eduardo Carneiro
    Abstract:

    : Loopers such as Chrysodeixis includens (Walker), Rachiplusia nu (Guenee), and Trichoplusia ni (Hubner) are important defoliators in soybean, sunflower, and crucifer crops, respectively, in countries of the Americas. The Biotic Potential of these polyphagous species of Plusiinae was comparatively examined considering crop rotation and succession scenarios in which crucifer crops are cultivated during or after Brazilian winter. All the species developed and reproduced on soybean (BRS 133 Embrapa) and forage turnip (Cati AL 1000, Wolf Seeds do Brasil). The development of C. includens was similar on both host plants. The survival of R. nu was lower on forage turnip than on soybean. In contrast, T. ni performance (survival, fecundity, pupal weight) was better on forage turnip than on soybean. This suggests that in crop rotation and succession scenarios of soybean after brassicacea, C. includens is likely to have a higher number of generations per year and could be Potentially more harmful.

  • Biotic Potential and reproductive parameters of Spodoptera cosmioides (Walker) (Lepidoptera: Noctuidae) in the laboratory
    Brazilian Journal of Biology, 2018
    Co-Authors: Alexandre Specht, Vânia Ferreira Roque-specht
    Abstract:

    : In this study we evaluate the Biotic Potential and reproductive parameters of Spodoptera cosmioides (Walker, 1858) under controlled conditions (25 ± 1 °C, 70 ± 10% RH and 14 hour photophase). Females, on average, (14.433 days) did not live significantly longer than their male counterparts (13.100 days). The mean durations of the pre-oviposition, oviposition and post-oviposition periods were 2.767, 10.600 and 1.067 days, respectively. The mean fecundity of females was 5,073.533 eggs and the mean fertility was 5,021.027 larvae. On average, females copulated 1.167 times. Fecundity was positively correlated with the number of copulations (r = 0.583, P

Débora Goulart Montezano - One of the best experts on this subject based on the ideXlab platform.

  • Biotic Potential and reproductive parameters of Spodoptera eridania (Stoll) (Lepidoptera, Noctuidae) in the laboratory
    Revista Brasileira de Entomologia, 2020
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, Daniel Ricardo Sosa-gómez, Vânia Ferreira Roque-specht, Neiva Monteiro De Barros
    Abstract:

    Biotic Potential and reprodutcive parameters of Spodoptera eridania (Stoll) (Lepidoptera, Noctuidae) in the laboratory: This study aimed to evaluate the Biotic Potential and reproductive parameters of Spodoptera eridania (Stoll, 1782) under controlled conditions (25 ± 1ºC, 70 ± 10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity and fertility of 15 couples was evaluated. The longevity of females (10.80 days) was not significantly higher than those of males (9.27 days). The mean durations of the pre, post and oviposition periods were 2.067, 0.600 and 8.133 days, respectively. The mean fecundity per female was 1,398 eggs and the mean fertility was 1,367.50 larvae. On average, females copulated 1.133 times. A strong positive correlation was observed between the number of mating and fecundity (r = 0.881, P

  • Biotic Potential and reproductive parameters of spodoptera frugiperda j e smith 1797 lepidoptera noctuidae
    The Journal of Agricultural Science, 2019
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, D R Sosagomez, Vânia F Roquespecht, J V Malaquias, Silvana Vieira De Paulamoraes, Julie A Peterson, Thomas E Hunt
    Abstract:

    The fall armyworm, Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae), a native to the Americas and recently reported in Africa, Germany, the Netherlands and India, is a significant pest of many crop species. Although a widespread and important pest, information on its biology and development are incomplete and require detailed study. In this study, the Biotic Potential and reproductive parameters of S. frugiperda were evaluated under controlled conditions (25±1 °C, 70±10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity, and fertility of 30 pairs were evaluated. The longevity of females (10.87 days) was not significantly different from that of males (10.90 days). The mean durations of the pre-, post- and oviposition periods were 2.63, 0.53 and 7.70 days, respectively. The mean fecundity was 2,370.66 eggs per female and mean fertility was 2,309.03 larvae per female. On average, a female copulated 1.6 times. The Biotic Potential of S. frugiperda was estimated at 2.086 × 1029 individuals/female/year. The net reproductive rate (Ro) was 1,079.73 times per generation and the mean generation time (T) was 32.00 days. The intrinsic rate of increase (rm) was 0.22, with a finite rate of increase (λ) of 1.24 per day. This study evaluates and describes the biological parameters of S. frugiperda with special emphasis on its Biotic Potential and reproductive parameters. This information will improve the development of integrated pest management (IPM) and insect resistance management (IRM) for this species.

  • Biotic Potential and reproductive parameters of spodoptera dolichos lepidoptera noctuidae in the laboratory
    Revista Brasileira De Entomologia, 2015
    Co-Authors: Débora Goulart Montezano, D R Sosagomez, Vânia F Roquespecht, Silvana Vieira De Paulamoraes, Edegar Fronza, Neiva Monteiro De Barros, Alexandre Specht
    Abstract:

    The Biotic Potential and reproductive parameters of Spodoptera dolichos (Fabricius, 1794) were evaluated under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity, and fertility of 25 couples were evaluated. The longevity of females (12.9 days) was not significantly different than that of males (12.4 days). The mean durations of the pre-, post- and oviposition periods were 3.0, 0.4 and 10.4 days, respectively. The mean fecundity was 4,086.0 eggs per female and mean fertility was 3,557.8 larvae per female. On average, a female copulated 1.4 times. The Biotic Potential of S. dolichos was estimated at 7.138 x 1018 individuals/female/year. The net reproductive rate (Ro) was 1,711.98 times per generation and the mean generation time (T) was 56.19 days. The intrinsic rate of increase (rm) was 0.133, with a finite rate of increase (l) of 1.142 per day. These results are compared with other species from Spodoptera and their relevance for management strategies of S. dolichos.

  • Biotic Potential fertility and life table of spodoptera albula walker lepidoptera noctuidae under controlled conditions
    Anais Da Academia Brasileira De Ciencias, 2014
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, D R Sosagomez, Vânia F Roquespecht, Edegar Fronza, Tarciso M Bortolin, Patricia Pezzi, Neiva Monteiro De Barros
    Abstract:

    This study aimed to evaluate the Biotic Potential, life table parameters and fertility of Spodoptera albula (Walker, 1857) under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photo phase). The longevity, pre, post and oviposition periods, fecundity and fertility of 13 couples were evaluated. The longevity of females (13.500 days) was significantly higher than those of males (11.154 days). The mean durations of the pre, post and oviposition periods were 2.615, 1.769 and 9.385 days, respectively. The mean fecundity was 1.417.69 eggs and mean fertility was 1.340.401 larvae, per female. On average, females copulated 1, 231 times. A strong positive correlation was observed between the number of copulations and fecundity (r = 0.847, p <0.001), as well as a strong negative correlation between the number of copulations and the duration of the pre-oviposition period (r = -0.762, p = 0.002), and longevity (r = -0.788, p = 0.001). The Biotic Potential of S. albula was estimated at 8.768 x 10 22 individuals / female / year. The net reproductive rate (Ro) was 353,904 times per generation and the mean generation time (T) was 37.187 days. The intrinsic rate of increase (rm) was 1,105, with a finite rate of increase (λ) of 3,019.

  • Biotic Potential, fertility and life table of Spodoptera albula (Walker) (Lepidoptera: Noctuidae), under controlled conditions
    Anais Da Academia Brasileira De Ciencias, 2014
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, Daniel Ricardo Sosa-gómez, Vânia Ferreira Roque-specht, Edegar Fronza, Tarciso M Bortolin, Patricia Pezzi, Neiva Monteiro De Barros
    Abstract:

    This study aimed to evaluate the Biotic Potential, life table parameters and fertility of Spodoptera albula (Walker, 1857) under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photo phase). The longevity, pre, post and oviposition periods, fecundity and fertility of 13 couples were evaluated. The longevity of females (13.500 days) was significantly higher than those of males (11.154 days). The mean durations of the pre, post and oviposition periods were 2.615, 1.769 and 9.385 days, respectively. The mean fecundity was 1.417.69 eggs and mean fertility was 1.340.401 larvae, per female. On average, females copulated 1, 231 times. A strong positive correlation was observed between the number of copulations and fecundity (r = 0.847, p

Vânia F Roquespecht - One of the best experts on this subject based on the ideXlab platform.

  • Biotic Potential and reproductive parameters of spodoptera frugiperda j e smith 1797 lepidoptera noctuidae
    The Journal of Agricultural Science, 2019
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, D R Sosagomez, Vânia F Roquespecht, J V Malaquias, Silvana Vieira De Paulamoraes, Julie A Peterson, Thomas E Hunt
    Abstract:

    The fall armyworm, Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae), a native to the Americas and recently reported in Africa, Germany, the Netherlands and India, is a significant pest of many crop species. Although a widespread and important pest, information on its biology and development are incomplete and require detailed study. In this study, the Biotic Potential and reproductive parameters of S. frugiperda were evaluated under controlled conditions (25±1 °C, 70±10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity, and fertility of 30 pairs were evaluated. The longevity of females (10.87 days) was not significantly different from that of males (10.90 days). The mean durations of the pre-, post- and oviposition periods were 2.63, 0.53 and 7.70 days, respectively. The mean fecundity was 2,370.66 eggs per female and mean fertility was 2,309.03 larvae per female. On average, a female copulated 1.6 times. The Biotic Potential of S. frugiperda was estimated at 2.086 × 1029 individuals/female/year. The net reproductive rate (Ro) was 1,079.73 times per generation and the mean generation time (T) was 32.00 days. The intrinsic rate of increase (rm) was 0.22, with a finite rate of increase (λ) of 1.24 per day. This study evaluates and describes the biological parameters of S. frugiperda with special emphasis on its Biotic Potential and reproductive parameters. This information will improve the development of integrated pest management (IPM) and insect resistance management (IRM) for this species.

  • Biotic Potential and reproductive parameters of spodoptera cosmioides walker lepidoptera noctuidae in the laboratory
    Brazilian Journal of Biology, 2019
    Co-Authors: Alexandre Specht, Vânia F Roquespecht
    Abstract:

    : In this study we evaluate the Biotic Potential and reproductive parameters of Spodoptera cosmioides (Walker, 1858) under controlled conditions (25 ± 1 °C, 70 ± 10% RH and 14 hour photophase). Females, on average, (14.433 days) did not live significantly longer than their male counterparts (13.100 days). The mean durations of the pre-oviposition, oviposition and post-oviposition periods were 2.767, 10.600 and 1.067 days, respectively. The mean fecundity of females was 5,073.533 eggs and the mean fertility was 5,021.027 larvae. On average, females copulated 1.167 times. Fecundity was positively correlated with the number of copulations (r = 0.583, P <0.001). The number of copulations, however, was negatively correlated whit the duration of the pre-oviposition (r = -0.560, P = 0.007) and oviposition (r = -0.479, P = 0.048) periods, and overall longevity (r = -0.512, P = 0.031). The Biotic Potential was estimated at 6.547 x 1021 individuals/female/year. The net reproductive rate (Ro) was 2,193.722 times per generation and the mean generation time (T) was 46.407 days. The intrinsic rate of increase (rm) was 0.166, with a finite rate of increase (λ) of 1.180, per week.

  • Biotic Potential and life tables of chrysodeixis includens lepidoptera noctuidae rachiplusia nu and trichoplusia ni on soybean and forage turnip
    Journal of Insect Science, 2019
    Co-Authors: Alexandre Specht, D R Sosagomez, Vânia F Roquespecht, Eduardo Valduga, Felipe Gonzatti, Sabrina Maurer Schuh, Eduardo Carneiro
    Abstract:

    : Loopers such as Chrysodeixis includens (Walker), Rachiplusia nu (Guenee), and Trichoplusia ni (Hubner) are important defoliators in soybean, sunflower, and crucifer crops, respectively, in countries of the Americas. The Biotic Potential of these polyphagous species of Plusiinae was comparatively examined considering crop rotation and succession scenarios in which crucifer crops are cultivated during or after Brazilian winter. All the species developed and reproduced on soybean (BRS 133 Embrapa) and forage turnip (Cati AL 1000, Wolf Seeds do Brasil). The development of C. includens was similar on both host plants. The survival of R. nu was lower on forage turnip than on soybean. In contrast, T. ni performance (survival, fecundity, pupal weight) was better on forage turnip than on soybean. This suggests that in crop rotation and succession scenarios of soybean after brassicacea, C. includens is likely to have a higher number of generations per year and could be Potentially more harmful.

  • Biotic Potential and reproductive parameters of spodoptera dolichos lepidoptera noctuidae in the laboratory
    Revista Brasileira De Entomologia, 2015
    Co-Authors: Débora Goulart Montezano, D R Sosagomez, Vânia F Roquespecht, Silvana Vieira De Paulamoraes, Edegar Fronza, Neiva Monteiro De Barros, Alexandre Specht
    Abstract:

    The Biotic Potential and reproductive parameters of Spodoptera dolichos (Fabricius, 1794) were evaluated under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photophase). The longevity, pre-, post- and oviposition periods, fecundity, and fertility of 25 couples were evaluated. The longevity of females (12.9 days) was not significantly different than that of males (12.4 days). The mean durations of the pre-, post- and oviposition periods were 3.0, 0.4 and 10.4 days, respectively. The mean fecundity was 4,086.0 eggs per female and mean fertility was 3,557.8 larvae per female. On average, a female copulated 1.4 times. The Biotic Potential of S. dolichos was estimated at 7.138 x 1018 individuals/female/year. The net reproductive rate (Ro) was 1,711.98 times per generation and the mean generation time (T) was 56.19 days. The intrinsic rate of increase (rm) was 0.133, with a finite rate of increase (l) of 1.142 per day. These results are compared with other species from Spodoptera and their relevance for management strategies of S. dolichos.

  • Biotic Potential fertility and life table of spodoptera albula walker lepidoptera noctuidae under controlled conditions
    Anais Da Academia Brasileira De Ciencias, 2014
    Co-Authors: Débora Goulart Montezano, Alexandre Specht, D R Sosagomez, Vânia F Roquespecht, Edegar Fronza, Tarciso M Bortolin, Patricia Pezzi, Neiva Monteiro De Barros
    Abstract:

    This study aimed to evaluate the Biotic Potential, life table parameters and fertility of Spodoptera albula (Walker, 1857) under controlled conditions (25 ± 1°C, 70 ± 10% RH and 14 hour photo phase). The longevity, pre, post and oviposition periods, fecundity and fertility of 13 couples were evaluated. The longevity of females (13.500 days) was significantly higher than those of males (11.154 days). The mean durations of the pre, post and oviposition periods were 2.615, 1.769 and 9.385 days, respectively. The mean fecundity was 1.417.69 eggs and mean fertility was 1.340.401 larvae, per female. On average, females copulated 1, 231 times. A strong positive correlation was observed between the number of copulations and fecundity (r = 0.847, p <0.001), as well as a strong negative correlation between the number of copulations and the duration of the pre-oviposition period (r = -0.762, p = 0.002), and longevity (r = -0.788, p = 0.001). The Biotic Potential of S. albula was estimated at 8.768 x 10 22 individuals / female / year. The net reproductive rate (Ro) was 353,904 times per generation and the mean generation time (T) was 37.187 days. The intrinsic rate of increase (rm) was 1,105, with a finite rate of increase (λ) of 3,019.

Naeem Abbas - One of the best experts on this subject based on the ideXlab platform.

  • Effect of emamectin benzoate on life history traits and relative fitness of Spodoptera litura (Lepidoptera: Noctuidae)
    Phytoparasitica, 2014
    Co-Authors: Syed Muhammad Zaka, Sarfraz Ali Shad, Naeem Abbas, Rizwan Mustafa Shah
    Abstract:

    Emamectin benzoate, a semisynthetic bioinsecticide, has been used frequently for the management of lepidopteran pests of cotton worldwide. To assess the resistance risk and design strategy for resistance management, life history traits were established for emamectin benzoate-resistant, unselected and susceptible S. litura strains based on the laboratory observations. Bioassay results showed that the emamectin benzoate-selected strain developed a resistance ratio of 911-fold compared with that of the susceptible strain. The emamectin-selected strain had a relative fitness of 0.37 and lower prepupal and pupal weights, prolonged larval duration and development time, lower fecundity and hatchability compared with the susceptible strain. Mean population growth rates, such as intrinsic rate of population increase and Biotic Potential, were lower for the emamectin-selected strain compared with the susceptible strain. Development of resistance can cost considerable fitness for the emamectin-selected strain. The present study provided useful information for determining Potential management strategies to overcome development of resistance.

  • Resistance of Spodoptera litura (Lepidoptera: Noctuidae) to profenofos: Relative fitness and cross resistance
    Crop Protection, 2014
    Co-Authors: Naeem Abbas, Muhammad Razaq, Sarfraz Ali Shad, Samiullah, Abdul Waheed, Muhammad Aslam
    Abstract:

    Profenofos, an acetylcholine esterase inhibitor insecticide, has been used for the management of various lepidopteron pests of many crops in Pakistan. In the present study, we investigated the impact of insecticide resistance on fitness cost in Spodoptera litura, and evaluated cross resistance to other insecticides. The effect of profenofos on different life history parameters including survival rate, female ratio, fecundity and hatchability, intrinsic rate of population increase and Biotic Potential was determined. Significant differences associated with fitness costs were revealed. A field collected S. litura strain was selected by exposure to profenofos in the laboratory (Profen-SEL) and after 14 generations of selection it developed a 52-fold resistance to this insecticide. The Profen-SEL strain showed high cross-resistance to chlorpyrifos (62-fold), but very low to no cross resistance to lambda-cyhalothrin (2.34-fold) or methomyl (0.80-fold), respectively. The resistant strain had a relative fitness of 0.38 with a low larval survival rate, longer larval duration, longer male pupal duration, longer development time, low emergence rate of healthy adults, fecundity and hatchability compared with an unselected strain. The intrinsic rate of natural population increase, mean relative growth rate and Biotic Potential were lower for the selected strain compared with an unselected strain. Development of resistance may cause fitness costs for the resistant strain. This study provided important information for understanding profenofos resistance and facilitating a better strategy for the management of resistance.

  • Increased fitness and realized heritability in emamectin benzoate-resistant Chrysoperla carnea (Neuroptera: Chrysopidae)
    Ecotoxicology, 2013
    Co-Authors: Muhammad Mudassir Mansoor, Attaullah Khan Pathan, Sarfraz Ali Shad, Naeem Abbas, Muhammad Razaq
    Abstract:

    The common green lacewing Chrysoperla carnea is a key biological control agent employed in integrated pest management (IPM) programs for managing various insect pests. A field collected population of C. carnea was selected for emamectin benzoate resistance in the laboratory and fitness costs and realized heritability were investigated. After five generations of selection with emamectin benzoate, C. carnea developed a 318-fold resistance to the insecticide. The resistant population had a relative fitness of 1.49, with substantially higher emergence rate of healthy adults, fecundity and hatchability and shorter larval duration, pupal duration, and development time compared to the susceptible population. Mean population growth rates; such as the intrinsic rate of natural population increase and Biotic Potential were higher for the emamectin benzoate selected population compared to the susceptible population. The realized heritability ( h ^2) value of emamectin benzoate resistance was 0.34 in emamectin benzoate selected population of C. carnea . Chrysoperla species which show resistance to insecticides makes them compatible with those IPM systems where emamectin benzoate is employed.

Muhammad Razaq - One of the best experts on this subject based on the ideXlab platform.

  • Resistance of Spodoptera litura (Lepidoptera: Noctuidae) to profenofos: Relative fitness and cross resistance
    Crop Protection, 2014
    Co-Authors: Naeem Abbas, Muhammad Razaq, Sarfraz Ali Shad, Samiullah, Abdul Waheed, Muhammad Aslam
    Abstract:

    Profenofos, an acetylcholine esterase inhibitor insecticide, has been used for the management of various lepidopteron pests of many crops in Pakistan. In the present study, we investigated the impact of insecticide resistance on fitness cost in Spodoptera litura, and evaluated cross resistance to other insecticides. The effect of profenofos on different life history parameters including survival rate, female ratio, fecundity and hatchability, intrinsic rate of population increase and Biotic Potential was determined. Significant differences associated with fitness costs were revealed. A field collected S. litura strain was selected by exposure to profenofos in the laboratory (Profen-SEL) and after 14 generations of selection it developed a 52-fold resistance to this insecticide. The Profen-SEL strain showed high cross-resistance to chlorpyrifos (62-fold), but very low to no cross resistance to lambda-cyhalothrin (2.34-fold) or methomyl (0.80-fold), respectively. The resistant strain had a relative fitness of 0.38 with a low larval survival rate, longer larval duration, longer male pupal duration, longer development time, low emergence rate of healthy adults, fecundity and hatchability compared with an unselected strain. The intrinsic rate of natural population increase, mean relative growth rate and Biotic Potential were lower for the selected strain compared with an unselected strain. Development of resistance may cause fitness costs for the resistant strain. This study provided important information for understanding profenofos resistance and facilitating a better strategy for the management of resistance.

  • Increased fitness and realized heritability in emamectin benzoate-resistant Chrysoperla carnea (Neuroptera: Chrysopidae)
    Ecotoxicology, 2013
    Co-Authors: Muhammad Mudassir Mansoor, Attaullah Khan Pathan, Sarfraz Ali Shad, Naeem Abbas, Muhammad Razaq
    Abstract:

    The common green lacewing Chrysoperla carnea is a key biological control agent employed in integrated pest management (IPM) programs for managing various insect pests. A field collected population of C. carnea was selected for emamectin benzoate resistance in the laboratory and fitness costs and realized heritability were investigated. After five generations of selection with emamectin benzoate, C. carnea developed a 318-fold resistance to the insecticide. The resistant population had a relative fitness of 1.49, with substantially higher emergence rate of healthy adults, fecundity and hatchability and shorter larval duration, pupal duration, and development time compared to the susceptible population. Mean population growth rates; such as the intrinsic rate of natural population increase and Biotic Potential were higher for the emamectin benzoate selected population compared to the susceptible population. The realized heritability ( h ^2) value of emamectin benzoate resistance was 0.34 in emamectin benzoate selected population of C. carnea . Chrysoperla species which show resistance to insecticides makes them compatible with those IPM systems where emamectin benzoate is employed.