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<p>The coconut rhinoceros beetle, <i>Oryctes rhinoceros</i> (Coleoptera, Scarabaeidae), is an invasive insect that feeds primarily on coconut palms. It was historically controlled with the release of specimens infected with <i>Oryctes nudivirus</i> (OrNV), until beetles resistant to OrNV were first found in Guam. Since then, this biotype of <i>O. rhinoceros</i> was found in many new areas across the Pacific, and in 2013 arrived on the Hawaiian Island of O’ahu. This was followed by an extensive eradication program using tools such as mass trapping, detector dogs, green waste sanitation, and insecticidal treatments. Our studies reported here evaluated the efficacy of systemic insecticides in laboratory and field settings as a potential component of the integrated pest management program. The laboratory assays tested the efficacy of imidacloprid, dinotefuran, and abamectin at 250 and 25 parts per million active ingredient on laboratory reared adult rhinoceros beetles. Two concurrent field trials were conducted to evaluate the preventative and curative effects of injecting imidacloprid, dinotefuran, abamectin, and acephate into coconut palms. Efficacy of treatments was determined by taking visual monthly measurements of <i>O. rhinoceros</i> feeding damage. The results of the laboratory trials indicated that every chemical was effective at both 250 and 25 ppm active ingredients. The field trial results indicated that imidacloprid injections reduced the total amount of new feeding damage in the apical meristem of coconut palms, with statistical significance of the odds ratios indicating that imidacloprid effectively reduced canopy damage and new feeding damage compared to the other treatments. Palm injections can be used in conjunction with an integrated pest management program to manage <i>O. rhinoceros</i> populations.</p>

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Efficacies of systemic insecticides against the coconut rhinoceros beetle, Oryctes rhinoceros (Coleoptera, Scarabaeidae), on O’ahu, Hawai’i

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Mason Russo,
  • Philip Waisen,
  • Kenneth Choi,
  • Zhiqiang Cheng

摘要

The coconut rhinoceros beetle, Oryctes rhinoceros (Coleoptera, Scarabaeidae), is an invasive insect that feeds primarily on coconut palms. It was historically controlled with the release of specimens infected with Oryctes nudivirus (OrNV), until beetles resistant to OrNV were first found in Guam. Since then, this biotype of O. rhinoceros was found in many new areas across the Pacific, and in 2013 arrived on the Hawaiian Island of O’ahu. This was followed by an extensive eradication program using tools such as mass trapping, detector dogs, green waste sanitation, and insecticidal treatments. Our studies reported here evaluated the efficacy of systemic insecticides in laboratory and field settings as a potential component of the integrated pest management program. The laboratory assays tested the efficacy of imidacloprid, dinotefuran, and abamectin at 250 and 25 parts per million active ingredient on laboratory reared adult rhinoceros beetles. Two concurrent field trials were conducted to evaluate the preventative and curative effects of injecting imidacloprid, dinotefuran, abamectin, and acephate into coconut palms. Efficacy of treatments was determined by taking visual monthly measurements of O. rhinoceros feeding damage. The results of the laboratory trials indicated that every chemical was effective at both 250 and 25 ppm active ingredients. The field trial results indicated that imidacloprid injections reduced the total amount of new feeding damage in the apical meristem of coconut palms, with statistical significance of the odds ratios indicating that imidacloprid effectively reduced canopy damage and new feeding damage compared to the other treatments. Palm injections can be used in conjunction with an integrated pest management program to manage O. rhinoceros populations.