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<p>The sweetpotatoes (<i>Ipomoea batatas</i> (L.) Lam.) is a crucial root crop in Ethiopia, and provides sustenance and economic benefits to millions of people. However, sweetpotato production is severely threatened by sweetpotato weevils (SPW) (<i>Cylas</i> spp.), which damage both field plants and storage root. This study was conducted to determine the efficacy of eight insecticides combination for controlling sweetpotato weevil (SPW). The field experiment was conducted in the growing seasons during 2021 and 2022 at Werer Agricultural Research Center, Ethiopia. Nine treatments, including an untreated control, were arranged in a randomized complete block design (RCBD) and replicated three times. Data on weevil population density, stem and storage root damage, and storage root yield were collected and analyzed. The results showed that, in comparison to the untreated control, different insecticides had significant effects (<i>P</i> &lt; 0.001) on stem and storage weevil populations, as well as on the percentage of infestation, damage score, and the overall marketable root yield. The use of insecticides increased the marketable root yield from 47 to 103% compared to that of the untreated control. The highest populations of weevils were recorded in the untreated control group and following the combined vine dipping and foliar application of dinotefuran 50% SG. In contrast, the lowest weevil populations were observed with the application of Profenofos 40% + cypermethrin 4%. Cost-benefit analysis indicated that the insecticide combinations of Profenofos 40% + cypermethrin 4% EC and Profenofos 40% + alpha-cypermethrin 4% yielded the highest cost-benefit ratios of 11.6 and 11.5, respectively, demonstrating their profitability in sweetpotato production. This study highlights that the combination of vine dipping and foliar application of Profenofos 40% + cypermethrin 4% and Profenofos 40% + alpha-cypermethrin 4% was significantly effective in controlling weevil populations and minimizing damage to both vines and storage roots. These findings provide valuable insight for improving SPW management strategies in sweet potato production, especially in the regions with a high SPW intensity. To reduce resistance and environmental risks, insecticides with multiple active ingredients should be applied following standard procedures and under agricultural supervision. Ongoing monitoring and resistance management strategies are also essential.</p>

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Evaluation of insecticides against the sweetpotato weevil, Cylas spp. (Insecta; Coleoptera) in Ethiopia

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Zemedkun Alemu,
  • Nurhussen Seid,
  • Sileshi Getahun

摘要

The sweetpotatoes (Ipomoea batatas (L.) Lam.) is a crucial root crop in Ethiopia, and provides sustenance and economic benefits to millions of people. However, sweetpotato production is severely threatened by sweetpotato weevils (SPW) (Cylas spp.), which damage both field plants and storage root. This study was conducted to determine the efficacy of eight insecticides combination for controlling sweetpotato weevil (SPW). The field experiment was conducted in the growing seasons during 2021 and 2022 at Werer Agricultural Research Center, Ethiopia. Nine treatments, including an untreated control, were arranged in a randomized complete block design (RCBD) and replicated three times. Data on weevil population density, stem and storage root damage, and storage root yield were collected and analyzed. The results showed that, in comparison to the untreated control, different insecticides had significant effects (P < 0.001) on stem and storage weevil populations, as well as on the percentage of infestation, damage score, and the overall marketable root yield. The use of insecticides increased the marketable root yield from 47 to 103% compared to that of the untreated control. The highest populations of weevils were recorded in the untreated control group and following the combined vine dipping and foliar application of dinotefuran 50% SG. In contrast, the lowest weevil populations were observed with the application of Profenofos 40% + cypermethrin 4%. Cost-benefit analysis indicated that the insecticide combinations of Profenofos 40% + cypermethrin 4% EC and Profenofos 40% + alpha-cypermethrin 4% yielded the highest cost-benefit ratios of 11.6 and 11.5, respectively, demonstrating their profitability in sweetpotato production. This study highlights that the combination of vine dipping and foliar application of Profenofos 40% + cypermethrin 4% and Profenofos 40% + alpha-cypermethrin 4% was significantly effective in controlling weevil populations and minimizing damage to both vines and storage roots. These findings provide valuable insight for improving SPW management strategies in sweet potato production, especially in the regions with a high SPW intensity. To reduce resistance and environmental risks, insecticides with multiple active ingredients should be applied following standard procedures and under agricultural supervision. Ongoing monitoring and resistance management strategies are also essential.