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<p><i>Diabrotica speciosa</i> (Germar, 1824) (Coleoptera: Chrysomelidae) damages soybean plants at all stages of crop development. The damage caused by adults is due to plant defoliation, while the larvae consume the roots of soybean plants. Plant resistance to insects is important in the integrated management of <i>D. speciosa</i> in soybeans. This study aimed to identify sources of antixenosis (non-preference for feeding and oviposition) and antibiosis (biological parameters of larvae) of <i>D. speciosa</i> in soybean genotypes. Antixenosis was measured by attractiveness, consumed leaf area, trichome density, egg counts, and plant color. Antibiosis was determined by weight and larva counts. Trichome density and leaf color indicated that the genotypes PI 227687, PI 227682, IAC 100, BRS 7170 IPRO, BRS 8170 IPRO, and M 7739 IPRO showed antixenosis to <i>D. speciosa</i>. M 7110 IPRO, BRS 8170 IPRO, IAC 100, and PI 227687 restricted the development of <i>D. speciosa</i> larvae. Therefore, the soybean cultivars BRS 8170 IPRO, BRS 7170 IPRO, M 7110 IPRO, and M 7739 IPRO could be appropriate candidates for Integrated Pest Management strategies given their moderate resistance to <i>D. speciosa</i>. Finally, trichome density and plant leaf color can be used to screen soybean genotypes for plant resistance to insects by antixenosis.</p>

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Larval development and adult preference of Diabrotica speciosa (Coleoptera: Chrysomelidae) in soybean genotypes

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Franciele Cristina da Silva,
  • André Cirilo de S. Almeida,
  • Edson Hirose,
  • Flávio G. de Jesus

摘要

Diabrotica speciosa (Germar, 1824) (Coleoptera: Chrysomelidae) damages soybean plants at all stages of crop development. The damage caused by adults is due to plant defoliation, while the larvae consume the roots of soybean plants. Plant resistance to insects is important in the integrated management of D. speciosa in soybeans. This study aimed to identify sources of antixenosis (non-preference for feeding and oviposition) and antibiosis (biological parameters of larvae) of D. speciosa in soybean genotypes. Antixenosis was measured by attractiveness, consumed leaf area, trichome density, egg counts, and plant color. Antibiosis was determined by weight and larva counts. Trichome density and leaf color indicated that the genotypes PI 227687, PI 227682, IAC 100, BRS 7170 IPRO, BRS 8170 IPRO, and M 7739 IPRO showed antixenosis to D. speciosa. M 7110 IPRO, BRS 8170 IPRO, IAC 100, and PI 227687 restricted the development of D. speciosa larvae. Therefore, the soybean cultivars BRS 8170 IPRO, BRS 7170 IPRO, M 7110 IPRO, and M 7739 IPRO could be appropriate candidates for Integrated Pest Management strategies given their moderate resistance to D. speciosa. Finally, trichome density and plant leaf color can be used to screen soybean genotypes for plant resistance to insects by antixenosis.