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<p>Three ladybird species, <i>Hyperaspis sinensis</i> (Crotch), <i>Nephus phosphorus</i> (Lewis), and <i>Chilocorus renipustulatus</i> (Scriba) (Coleoptera: Coccinellidae), attack mealybugs (Hemiptera: Pseudococcidae) on citrus trees in Japan. They may have the potential to effectively control mealybug populations in citrus groves and would therefore need to be protected from pesticide applications. Seasonal change in adult abundance of each ladybird species was monitored using yellow sticky traps set within citrus tree canopies for four years in citrus groves at an experimental site and for two years in commercial groves in Shizuoka City, central Japan; these groves varied in the level of pesticide application. At the experimental site, adults of each ladybird species were clearly more abundant in a pesticide-free grove than in reduced-pesticide and conventionally managed groves. More <i>H. sinensis</i> and <i>N. phosphorus</i> adults were trapped from mid-March to mid-May and from mid-March to late May, respectively, in the pesticide-free grove, while more <i>C. renipustulatus</i> adults were captured in October–November&#xa0;there. As for the commercial groves, a number of <i>H. sinensis</i> and <i>C. renipustulatus</i> adults were caught mainly&#xa0;in organic and reduced-pesticide groves, while <i>N. phosphorus</i> adults were rarely collected. The seasonal adult occurrence of <i>H. sinensis</i> and <i>C. renipustulatus</i> in the commercial groves was similar to that observed at the experimental site. These results suggest that application of pesticides that could have detrimental impacts on ladybird adults should be avoided in March–May (for <i>H. sinensis</i> and <i>N. phosphorus</i>) and October–November (for <i>C. renipustulatus</i>) to conserve these ladybird populations in central Japan citrus groves.</p>

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Comparison of seasonal adult occurrence of three ladybird species attacking mealybugs, Hyperaspis sinensis, Nephus phosphorus, and Chilocorus renipustulatus (Coleoptera: Coccinellidae), in citrus groves in central Japan: monitoring using sticky traps

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Shuji Kaneko

摘要

Three ladybird species, Hyperaspis sinensis (Crotch), Nephus phosphorus (Lewis), and Chilocorus renipustulatus (Scriba) (Coleoptera: Coccinellidae), attack mealybugs (Hemiptera: Pseudococcidae) on citrus trees in Japan. They may have the potential to effectively control mealybug populations in citrus groves and would therefore need to be protected from pesticide applications. Seasonal change in adult abundance of each ladybird species was monitored using yellow sticky traps set within citrus tree canopies for four years in citrus groves at an experimental site and for two years in commercial groves in Shizuoka City, central Japan; these groves varied in the level of pesticide application. At the experimental site, adults of each ladybird species were clearly more abundant in a pesticide-free grove than in reduced-pesticide and conventionally managed groves. More H. sinensis and N. phosphorus adults were trapped from mid-March to mid-May and from mid-March to late May, respectively, in the pesticide-free grove, while more C. renipustulatus adults were captured in October–November there. As for the commercial groves, a number of H. sinensis and C. renipustulatus adults were caught mainly in organic and reduced-pesticide groves, while N. phosphorus adults were rarely collected. The seasonal adult occurrence of H. sinensis and C. renipustulatus in the commercial groves was similar to that observed at the experimental site. These results suggest that application of pesticides that could have detrimental impacts on ladybird adults should be avoided in March–May (for H. sinensis and N. phosphorus) and October–November (for C. renipustulatus) to conserve these ladybird populations in central Japan citrus groves.