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<p>Peach leaf curl aphid, <i>Brachycaudus helichrysi</i> (Kaltenbach) (Hemiptera: Aphididae), is a widespread pest of stone fruits like peach, nectarine and plum, this aphid sucks sap from the leaves, leading to economic losses to the growers.&#xa0;Farmers generally rely on pesticides for managing this pest so far which are harmful to the environment. So to promote environmentally sustainable strategies for managing <i>B. helichrysi</i> we investigated the developmental biology, age-stage two-sex life table parameters, demographic traits and predatory efficiency of predator, <i>Cheilomenes sexmaculata</i> (Fabricius) (Coleoptera: Coccinellidae) under controlled laboratory conditions. The predator completed its life cycle successfully on <i>B. helichrysi</i>, indicating its suitability as a prey species. The demographic parameters revealed an intrinsic rate of increase (<i>r</i>) (offspring/individual/day) of 0.213 and a finite rate of increase (λ) (offspring/day) of 1.237, suggesting that <i>C. sexmaculata</i> has the potential for rapid population growth on this aphid. Predatory potential varied across developmental stages, with cumulative mean aphid consumption recorded as 18.10 ± 1.56 (1st instar), 22.15 ± 2.35 (2nd instar), 29.44 ± 1.20 (3rd instar) and 61.12 ± 5.83 (4th instar). Adult females and males exhibited significantly higher predation, consuming 2793.30 ± 3.16 and 2400.00 ± 2.65 aphids, respectively, throughout their lifespans. Host-kill parameter analysis using the CONSUME-MS Chart demonstrated a high net predation rate (<i>C</i><sub><i>0</i></sub>) of 2355.35 ± 222.86 and a transformation rate (<i>Q</i><sub><i>p</i></sub>) of 10.44 ± 2.35, reinforcing the predator’s efficiency in suppressing aphid populations. These findings highlight the substantial biocontrol potential of <i>C. sexmaculata</i> against <i>B. helichrysi</i> and support its inclusion as a key component in Integrated Pest Management (IPM) of this aphid. However, it is important to recognize that laboratory-based evaluation of natural enemies may not fully represent field conditions where various abiotic and biotic factors may influence predator’s performance. Therefore, further field-based validation is essential prior to large-scale implementation.</p>

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Biology, demographic traits and predation rate of Cheilomenes sexmaculata (Fabricius) (Coleoptera: Coccinellidae) on peach leaf curl aphid, Brachycaudus helichrysi (Kaltenbach) (Hemiptera: Aphididae)

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Aryan Bhandari,
  • Chander Singh,
  • Subhash Chander Verma,
  • Prem Lal Sharma,
  • Vishav Gaurav Singh Chandel,
  • Rajeshwar Singh Chandel,
  • Anshuman Semwal,
  • Sushmita,
  • Simran Sharma

摘要

Peach leaf curl aphid, Brachycaudus helichrysi (Kaltenbach) (Hemiptera: Aphididae), is a widespread pest of stone fruits like peach, nectarine and plum, this aphid sucks sap from the leaves, leading to economic losses to the growers. Farmers generally rely on pesticides for managing this pest so far which are harmful to the environment. So to promote environmentally sustainable strategies for managing B. helichrysi we investigated the developmental biology, age-stage two-sex life table parameters, demographic traits and predatory efficiency of predator, Cheilomenes sexmaculata (Fabricius) (Coleoptera: Coccinellidae) under controlled laboratory conditions. The predator completed its life cycle successfully on B. helichrysi, indicating its suitability as a prey species. The demographic parameters revealed an intrinsic rate of increase (r) (offspring/individual/day) of 0.213 and a finite rate of increase (λ) (offspring/day) of 1.237, suggesting that C. sexmaculata has the potential for rapid population growth on this aphid. Predatory potential varied across developmental stages, with cumulative mean aphid consumption recorded as 18.10 ± 1.56 (1st instar), 22.15 ± 2.35 (2nd instar), 29.44 ± 1.20 (3rd instar) and 61.12 ± 5.83 (4th instar). Adult females and males exhibited significantly higher predation, consuming 2793.30 ± 3.16 and 2400.00 ± 2.65 aphids, respectively, throughout their lifespans. Host-kill parameter analysis using the CONSUME-MS Chart demonstrated a high net predation rate (C0) of 2355.35 ± 222.86 and a transformation rate (Qp) of 10.44 ± 2.35, reinforcing the predator’s efficiency in suppressing aphid populations. These findings highlight the substantial biocontrol potential of C. sexmaculata against B. helichrysi and support its inclusion as a key component in Integrated Pest Management (IPM) of this aphid. However, it is important to recognize that laboratory-based evaluation of natural enemies may not fully represent field conditions where various abiotic and biotic factors may influence predator’s performance. Therefore, further field-based validation is essential prior to large-scale implementation.