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<p>Simultaneous tolerance of cowpea landraces and improved varieties to two key insect pests <i>Megalurothrips sjostedti</i> Trybom and <i>Maruca vitrata</i> Fabricius was assessed during the major rainy season of 2022 (May to August) through their phenotypic traits. Sixteen varieties were sown at the field campus of the International Institute of Tropical Agriculture (IITA), Benin station. These varieties were arranged in a balanced lattice design with 20 blocks, 5 replicates and 4 varieties per block. Population densities and damage of <i>M. sjostedti</i> and <i>M. vitrata</i> as well as grain yield, were recorded. Data were processed using the Analysis of Variance and Multiple Correspondence Analysis. The highest <i>M. sjostedti</i> population density was observed in the local variety Kan avo (40.27 ± 8.40 per flower), although high levels of damage were recorded in most of the tested varieties. The population density of <i>M. vitrata</i> was highest in flowers of IT 84&#xa0;S-2246-4 (3.40 ± 0.46 larvae/flower) compared with those of Kan avo (1.07 ± 0.12 larvae/flower), Swi Gué (1.13 ± 0.33 larvae/flower) and Kounado (1.33 ± 0.28 larvae/flower). However, flowers damage caused by <i>M. vitrata</i> larvae was higher in IT 84&#xa0;S-2246-4 compared to Kounado and Kan avo. The variety Swi Yanti Swan also recorded the highest yield, which was significantly greater than those of Swi Gué, Kounado, and Tchawé Kpèvi. Considering their overall performance combined with the results of Multiple correspondence analysis (MCA), the varieties Vidé, IT 86D-1057, Kpodjiguegue and IT 07&#xa0;K-292-10 were found to be simultaneously tolerant to both <i>M. sjostedti</i>, and <i>M. vitrata</i> with high yield despite high pest densities and substantial damage. Moreover, the local variety Kan avo exhibited a kind of resistance through antibiosis mechanism against the two pest species with low pests density and damage associated with high seeds yield. These varieties could therefore be incorporated into an integrated cowpea pest management strategy.</p>

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Tolerance to Megalurothrips sjostedti and Maruca vitrata in local and improved cowpea varieties in Benin

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Ayitondji Elie Dannon,
  • Caleb Todjro Stachys Dannon,
  • Aubin Manbou,
  • Yann Eméric Madode,
  • Arnaud Hounhoui-Gan,
  • Youna Hemery,
  • Aimé Bokonon-Ganta,
  • Manuele Tamò

摘要

Simultaneous tolerance of cowpea landraces and improved varieties to two key insect pests Megalurothrips sjostedti Trybom and Maruca vitrata Fabricius was assessed during the major rainy season of 2022 (May to August) through their phenotypic traits. Sixteen varieties were sown at the field campus of the International Institute of Tropical Agriculture (IITA), Benin station. These varieties were arranged in a balanced lattice design with 20 blocks, 5 replicates and 4 varieties per block. Population densities and damage of M. sjostedti and M. vitrata as well as grain yield, were recorded. Data were processed using the Analysis of Variance and Multiple Correspondence Analysis. The highest M. sjostedti population density was observed in the local variety Kan avo (40.27 ± 8.40 per flower), although high levels of damage were recorded in most of the tested varieties. The population density of M. vitrata was highest in flowers of IT 84 S-2246-4 (3.40 ± 0.46 larvae/flower) compared with those of Kan avo (1.07 ± 0.12 larvae/flower), Swi Gué (1.13 ± 0.33 larvae/flower) and Kounado (1.33 ± 0.28 larvae/flower). However, flowers damage caused by M. vitrata larvae was higher in IT 84 S-2246-4 compared to Kounado and Kan avo. The variety Swi Yanti Swan also recorded the highest yield, which was significantly greater than those of Swi Gué, Kounado, and Tchawé Kpèvi. Considering their overall performance combined with the results of Multiple correspondence analysis (MCA), the varieties Vidé, IT 86D-1057, Kpodjiguegue and IT 07 K-292-10 were found to be simultaneously tolerant to both M. sjostedti, and M. vitrata with high yield despite high pest densities and substantial damage. Moreover, the local variety Kan avo exhibited a kind of resistance through antibiosis mechanism against the two pest species with low pests density and damage associated with high seeds yield. These varieties could therefore be incorporated into an integrated cowpea pest management strategy.