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<p>Japanese beetle, <i>Popillia japonica</i> Newman, is an invasive species that attacks many field and ornamental crops. Intercropping soybean with sorghum is suggested as a strategy to reduce the abundance of <i>P. japonica</i> throughout soybean fields. The mechanism by which this affects <i>P. japonica</i> is unknown but may arise from a difference in the host plant compounds emitted by the intercropped plants because <i>P. japonica</i> responds to olfactory cues. In this study, we investigated a semiochemical-based mechanism for the behavioral response of <i>P. japonica</i> to intercropping soybean with sorghum by (1) evaluating <i>P. japonica</i> behavioral responses to solvent extracts from monocropped soy, intercropped soy, and a mixture of soy and sorghum extracts in no-choice video-tracking and preference in a release-recapture dual-choice assay to host stimuli from plants; and (2) applying solid-phase microextraction (SPME) in conjunction with gas chromatography coupled with mass spectrometry (GC-MS) to characterize the semiochemical profiles of each extract. We found unique semiochemical profiles among our treatments, with 1-octen-3-ol and 1-octanol characteristic of monocropped soybean and dodecane-1-iodo primarily in sorghum extracts. Nevertheless, our treatments did not significantly affect movement or orientation by <i>P. japonica</i> compared to controls, nor did conspecifics exhibit a significant preference for any of the treatments in a dual-choice assay at a local scale. Therefore, if intercropping soybean with sorghum significantly affects the behavior of <i>P. japonica</i> in the field, it may occur at a different scale, or in response to non-olfactory stimuli (e.g., visual, habitat, or landscape cues) rather than semiochemical cues.</p>

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Investigating a Semiochemical-Based Mechanism for the Beneficial Activity of Sorghum Intercropped with Soybeans on Management of Popillia Japonica

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Nicole B. Kucherov,
  • Matthew C. Hetherington,
  • Alison R. Gerken,
  • William R. Morrison III,
  • Tania N. Kim

摘要

Japanese beetle, Popillia japonica Newman, is an invasive species that attacks many field and ornamental crops. Intercropping soybean with sorghum is suggested as a strategy to reduce the abundance of P. japonica throughout soybean fields. The mechanism by which this affects P. japonica is unknown but may arise from a difference in the host plant compounds emitted by the intercropped plants because P. japonica responds to olfactory cues. In this study, we investigated a semiochemical-based mechanism for the behavioral response of P. japonica to intercropping soybean with sorghum by (1) evaluating P. japonica behavioral responses to solvent extracts from monocropped soy, intercropped soy, and a mixture of soy and sorghum extracts in no-choice video-tracking and preference in a release-recapture dual-choice assay to host stimuli from plants; and (2) applying solid-phase microextraction (SPME) in conjunction with gas chromatography coupled with mass spectrometry (GC-MS) to characterize the semiochemical profiles of each extract. We found unique semiochemical profiles among our treatments, with 1-octen-3-ol and 1-octanol characteristic of monocropped soybean and dodecane-1-iodo primarily in sorghum extracts. Nevertheless, our treatments did not significantly affect movement or orientation by P. japonica compared to controls, nor did conspecifics exhibit a significant preference for any of the treatments in a dual-choice assay at a local scale. Therefore, if intercropping soybean with sorghum significantly affects the behavior of P. japonica in the field, it may occur at a different scale, or in response to non-olfactory stimuli (e.g., visual, habitat, or landscape cues) rather than semiochemical cues.