Demographic parameters of the reduviid predator, Rhynocoris marginatus (Reduviidae: Hemiptera) fed on two lepidopterous
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Demographic parameters of the reduviid predator, Rhynocoris marginatus (Reduviidae: Hemiptera) fed on two lepidopterous insect pests Muhammad Arshad . Muhammad Irfan Ullah . Rashad Rasool Khan . Sana Anjum . Muhammad Tahir . Adeela Shamshad . Muhammad Rizwan
Received: 20 June 2020 / Accepted: 15 October 2020 Ó International Organization for Biological Control (IOBC) 2020
Abstract Rhynocoris marginatus (F.) (Reduviidae: Hemiptera:) is an efficient biocontrol agent in the management of multiple insect pests. The study aimed to assess the life table and demographic parameters of R. marginatus feeding on two lepidopterous insect pests, Spodoptera litura (Fab.) (Noctuidae) and Pieris brassicae (Linn.) (Pieridae). The developmental period of all life stages of R. marginatus was shorter when S. litura larvae were provided. The net reproductive rate (R0) was higher (411.4 offspring per Handling Editor: Eric Riddick M. Arshad (&) M. I. Ullah S. Anjum A. Shamshad Department of Entomology, University of Sargodha, Sargodha 40100, Pakistan e-mail: [email protected] M. Arshad M. I. Ullah China-Pakistan Joint Research Centre for Citrus Disease and Insect Pest Management, University of Sargodha, Sargodha 40100, Pakistan R. R. Khan University of Agriculture Faisalabad, Faisalabad 38000, Pakistan M. Tahir Department of Entomology, University College of Agriculture and Environmental Sciences, Islamia University Bahawalpur, Bahawalpur 63100, Pakistan M. Rizwan Rice Research Institute, Kala Shah Kaku, Lahore 39020, Pakistan
individual) on S. litura, while it was 112.4 offspring per individual on P. brassicae. Mean generation time (T) of R. marginatus was shorter (93.28 d) on S. litura than on P. brassicae (105.90 d). Values of the intrinsic rate of increase (0.064 d-1) and finite rate of increase (1.066 d-1) for R. marginatus fed on S. litura were found higher than on P. brassicae (0.044 d-1 and 1.045 d-1, respectively). Age-stage–specific survival rate and age-stage-specific fecundity of R. marginatus were higher feeding on S. litura compared to P. brassicae larvae. The S. litura was the most suitable prey as compared to P. brassicae for R. marginatus. Our study suggests R. marginatus as a useful biocontrol agent against S. litura pest. Keywords Life table parameters Pieris brassicae Rhynocoris marginatus Spodoptera litura
Introduction Armyworm, Spodoptera litura (Fab.) (Noctuidae: Lepidoptera) is a major insect pest of numerous agricultural crops and is broadly spread in the Pacific Islands, Australasia, and in tropical and temperate Asia (EPPO 2013). In Pakistan, it has been reported a major pest of various economically important crops including cotton, tomato, sunflower, tobacco, brinjal, cauliflower, cabbage, castor, soybean, lucerne, onion, and turnip (Ahmad et al. 2013; Abdullah et al. 2019).
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Due to high mobility, nocturnal habit, and oviposition on many agricultural crops, S. litura has a great potential to adopt a wider range of ecological
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