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<p>Modern agriculture urgently requires sustainable pest management strategies to reduce pesticide reliance. Intercropping, the practice of cultivating two or more crops together, can suppress pests, a phenomenon often associated with altered plant volatile profiles. This study investigated whether intercropping <i>Brassica rapa</i> with soybean (<i>Glycine max</i>) could suppress the green peach aphid (<i>Myzus persicae</i>) and enhance the attraction of its natural enemies. We hypothesized that soybean companionship would be associated with reduced aphid performance and increased attraction of natural enemies such as predators and parasitoids compared to <i>B. rapa</i> monocultures. Using controlled environment bioassays, we evaluated aphid survival, fecundity, population growth, and host preference across three planting patterns: a single <i>B. rapa</i> plant, two <i>B. rapa</i> plants grown together, and <i>B. rapa</i> intercropped with soybean. Further experiments assessed the preferences of key predatory insects and a parasitoid wasp. Key findings revealed that while short-term aphid fecundity and settlement were unaffected, seven-day population growth was significantly lower in the <i>B. rapa</i>-soybean combination. Furthermore, adult <i>Harmonia axyridis</i> predators showed a significant attraction to intercropped plants, though other natural enemies exhibited no significant differences in preference. We conclude that soybean intercropping is associated with the reduced <i>M. persicae</i> population growth and increased attraction of specific predators under controlled conditions, suggesting its potential as a sustainable tool for integrated pest management (IPM) programs.</p>

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Intercropping Brassica rapa with soybean suppresses Myzus persicae population growth and increases attraction of adult Harmonia axyridis

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Xixian Chen,
  • Zihao He,
  • Xu Yanbo,
  • Jamin Ali,
  • Adil Tonğa

摘要

Modern agriculture urgently requires sustainable pest management strategies to reduce pesticide reliance. Intercropping, the practice of cultivating two or more crops together, can suppress pests, a phenomenon often associated with altered plant volatile profiles. This study investigated whether intercropping Brassica rapa with soybean (Glycine max) could suppress the green peach aphid (Myzus persicae) and enhance the attraction of its natural enemies. We hypothesized that soybean companionship would be associated with reduced aphid performance and increased attraction of natural enemies such as predators and parasitoids compared to B. rapa monocultures. Using controlled environment bioassays, we evaluated aphid survival, fecundity, population growth, and host preference across three planting patterns: a single B. rapa plant, two B. rapa plants grown together, and B. rapa intercropped with soybean. Further experiments assessed the preferences of key predatory insects and a parasitoid wasp. Key findings revealed that while short-term aphid fecundity and settlement were unaffected, seven-day population growth was significantly lower in the B. rapa-soybean combination. Furthermore, adult Harmonia axyridis predators showed a significant attraction to intercropped plants, though other natural enemies exhibited no significant differences in preference. We conclude that soybean intercropping is associated with the reduced M. persicae population growth and increased attraction of specific predators under controlled conditions, suggesting its potential as a sustainable tool for integrated pest management (IPM) programs.