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<p>The brown planthopper (<i>Nilaparvata lugens</i> Stål) (Hemiptera: Delphacidae) is among the most destructive insect pests of rice (<i>Oryza sativa</i> L. (Family: Poaceae)) in India and the Asia-Pacific region. It frequently reaches outbreak levels causing yield losses of up to 60–80%. Conventional chemical control measures have contributed to the development of pesticide resistance and pest resurgence, highlighting the urgent need for sustainable and ecologically sound management alternatives. In recent years, anthocorid predators have gained significance in integrated pest management owing to the development of standardized mass-rearing protocols that facilitate their large-scale deployment in the field. <i>Amphiareus constrictus</i> (Stål) (Hemiptera: Anthocoridae), a relatively underexplored anthocorid predator, has shown promise as a biological control agent against BPH. Mass-rearing techniques for this species have only recently been standardized. In the present study, the feeding potential and functional response of <i>A. constrictus</i> were assessed under controlled laboratory conditions (27 ± 1&#xa0;°C; 70 ± 5% RH) using different developmental stages of BPH as prey. Predation was primarily directed at the egg stage, with daily egg consumption ranging from 0.4 ± 0.01 to 3.10 ± 0.10 eggs per individual across various nymphal instars. To evaluate the functional response, pre-starved fourth and fifth instar nymphs were exposed to varying prey densities (2, 3, 5, 7, and 10 BPH eggs). The predator exhibited a Holling’s Type II curvilinear functional response, indicating a higher proportion of eggs consumed at lower prey densities. These findings suggest that <i>A. constrictus</i> may be effective in suppressing early-stage infestations of BPH. Nevertheless, field-based evaluations are essential to determine its practical utility and adaptability in the dynamic conditions of rice agroecosystems.</p>

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Feeding potential and functional response of anthocorid predator, Amphiareus constrictus (Stal.) for biocontrol of rice brown planthopper Nilaparvata lugens Stal.

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • B. Lavanya,
  • Chitra Shanker,
  • D. K. Rana,
  • S. Amudhan,
  • Santosha Rathod,
  • Chandish Ballal

摘要

The brown planthopper (Nilaparvata lugens Stål) (Hemiptera: Delphacidae) is among the most destructive insect pests of rice (Oryza sativa L. (Family: Poaceae)) in India and the Asia-Pacific region. It frequently reaches outbreak levels causing yield losses of up to 60–80%. Conventional chemical control measures have contributed to the development of pesticide resistance and pest resurgence, highlighting the urgent need for sustainable and ecologically sound management alternatives. In recent years, anthocorid predators have gained significance in integrated pest management owing to the development of standardized mass-rearing protocols that facilitate their large-scale deployment in the field. Amphiareus constrictus (Stål) (Hemiptera: Anthocoridae), a relatively underexplored anthocorid predator, has shown promise as a biological control agent against BPH. Mass-rearing techniques for this species have only recently been standardized. In the present study, the feeding potential and functional response of A. constrictus were assessed under controlled laboratory conditions (27 ± 1 °C; 70 ± 5% RH) using different developmental stages of BPH as prey. Predation was primarily directed at the egg stage, with daily egg consumption ranging from 0.4 ± 0.01 to 3.10 ± 0.10 eggs per individual across various nymphal instars. To evaluate the functional response, pre-starved fourth and fifth instar nymphs were exposed to varying prey densities (2, 3, 5, 7, and 10 BPH eggs). The predator exhibited a Holling’s Type II curvilinear functional response, indicating a higher proportion of eggs consumed at lower prey densities. These findings suggest that A. constrictus may be effective in suppressing early-stage infestations of BPH. Nevertheless, field-based evaluations are essential to determine its practical utility and adaptability in the dynamic conditions of rice agroecosystems.