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<p><i>Cylas formicarius</i> (Fabricius) (Coleoptera: Brentidae)—the sweet potato weevil—which is one of the most severe pests of the sweet potato—<i>Ipomoea batatas</i> Lam.—was eradicated from Kume Island in 2012. Since then, the possible reinfestation of the island with weevils has been monitored through sex pheromone traps and host plant surveys. On August 10, 2021, a male weevil was captured for the first time since its eradication in 2012, and supplementary traps were immediately deployed. Host plant survey was conducted around the monitoring trap where the weevil was caught to detect the location of reoccurrence. The weevils were repeatedly caught by traps deployed in the sweet potato field; nevertheless, host plant surveys did not detect weevils on sweet potato or blue morning glory (<i>I. indica</i>). To control the pest, 3165&#xa0;kg of sweet potato was removed from the field, and the sterile insect technique (SIT) was applied (i.e., approximately 3,000,000 sterile weevils were released in the control area within a 0.5&#xa0;km radius from the traps of detection). As no weevils were detected within the traps or on the surveyed host plants for 197&#xa0;days since the last day a weevil was captured by a trap, which is equivalent to two generations of <i>C. formicarius</i>, the reinvading weevils were deemed to have been re-eradicated from Kume Island. Certain factors of the successful control are discussed in terms of monitoring and tactical control effectiveness. The efficiency of the re-eradication program, including the SIT, is also discussed in the context of previous studies. This case study provides practical insights into sustainable monitoring and rapid response strategies in the context of a possible reinfestation with <i>C. formicarius.</i></p>

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Successful control in the first recapture of the sweet potato weevil Cylas formicarius (Coleoptera: Brentidae) since its eradication from Kume Island, Japan

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • Yuko Shimizu,
  • Dai Haraguchi,
  • Yoshifumi Awaguni,
  • Chihiro Himuro

摘要

Cylas formicarius (Fabricius) (Coleoptera: Brentidae)—the sweet potato weevil—which is one of the most severe pests of the sweet potato—Ipomoea batatas Lam.—was eradicated from Kume Island in 2012. Since then, the possible reinfestation of the island with weevils has been monitored through sex pheromone traps and host plant surveys. On August 10, 2021, a male weevil was captured for the first time since its eradication in 2012, and supplementary traps were immediately deployed. Host plant survey was conducted around the monitoring trap where the weevil was caught to detect the location of reoccurrence. The weevils were repeatedly caught by traps deployed in the sweet potato field; nevertheless, host plant surveys did not detect weevils on sweet potato or blue morning glory (I. indica). To control the pest, 3165 kg of sweet potato was removed from the field, and the sterile insect technique (SIT) was applied (i.e., approximately 3,000,000 sterile weevils were released in the control area within a 0.5 km radius from the traps of detection). As no weevils were detected within the traps or on the surveyed host plants for 197 days since the last day a weevil was captured by a trap, which is equivalent to two generations of C. formicarius, the reinvading weevils were deemed to have been re-eradicated from Kume Island. Certain factors of the successful control are discussed in terms of monitoring and tactical control effectiveness. The efficiency of the re-eradication program, including the SIT, is also discussed in the context of previous studies. This case study provides practical insights into sustainable monitoring and rapid response strategies in the context of a possible reinfestation with C. formicarius.