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Role of shade trees in conserving beneficial arthropods of biocontrol importance in tea ecosystem

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Abstract

Naturally or artificially created diverse vegetation habitats often promote natural enemies of crop pests. The abundance of natural enemies increases with response to increasing habitat complexity at various spatial scales. Against this backdrop, we assessed the contribution of shade trees to conserve beneficial predatory and parasitoid arthropods at local scale in a subtropical tea agroecosystem in Bangladesh. Arthropods viz., predators and parasitoids were captured using Malaise traps in plots with shade trees and in those without shade trees having three different densities of tea bushes due to naturally created gaps (large-gap, small-gap and control). The number of arthropods captured in each plot corresponded to shade-tree and tea-bush densities, such that arthropod abundance in the shade-tree plot was twice that of the control plot, which had similar tea-bush density but no shade trees. Predators were least abundant in the large-gap plot, which had the lowest tea-bush density and no shade-trees, while 2.4–3.8 folds predators were captured in the control and shade-tree plots. There was a negative correlation between mean light intensity and number of predators in the four plots. Similar trends were observed for parasitoids. Relative abundance of predatory Staphylinidae was more than twice in the shade-tree and small-gap plots compared to control and large-gap plots. Relative abundance of parasitoid Ichneumonidae was ranked as small-gap > shade-tree > control > large-gap plots. Our results suggested that shade trees may help conserve and promote beneficial arthropods such as predators and parasitoids in tea agroecosystems.

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Acknowledgements

We are grateful to Mr. Syed Mahmood Hasan, Manager and Mr. Md. Mahbubur Rahman, Assistant Manager of Lakkatura Tea Estate in Sylhet for their kind permission and continuous support to conduct the field research activities in their tea estate. This study was funded by USAID, World Bank and GoB. We are grateful to PIU-BARC, NATP-2 due to their managerial assistance in project implementation. We are also grateful to Dr. Md. Aziz Zilani Chowdhury, Member Director (Crops), BARC, Dhaka for providing necessary guidelines during preparation of the project proposal. We thank Md. Mehedi Hasan, MS student, Department of Entomology, Sylhet Agricultural University for helping to prepare the site map.

Funding

The sub-project (ID: 474) was executed using the Competitive Research Grant of USAID Trust Fund, World Bank and Govt. of Bangladesh through Ministry of Agriculture. We would like to give thanks to the World Bank for arranging the grant fund. We are grateful to the authorities of Bangladesh Agricultural Research Council (BARC), Farmgate, Dhaka for their kind supervision during the project implementation.

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  1. Department of Entomology, Sylhet Agricultural University, Sylhet, 3100, Bangladesh

    Md. Abdul Maleque, Jannatul Ferdous, Ashika Akhter Shitel, Jaher Ahmed, Md. Fuad Mondal, Kamrul Hassan & Md. Abdur Razzak Choudhury

  2. Department of Crop Botany and Tea Production Technology, Sylhet Agricultural University, Sylhet, 3100, Bangladesh

    A. F. M. Saiful Islam

  3. Laboratory of Forest Resources, Graduate School of Agricultural Science, Kobe University, Kobe, 657–8501, Japan

    H. Roaki Ishii

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Contributions

M.A.M., H.R.I., J.F. and A. F. M.S.I. wrote the main manuscript text; A.A.S. and J.A. analyzed data; M.A.M., J.A. and H.R.I. prepared figures 1-4; M.A.M., M.F.M., K.H. and M.A.R.C. prepared tables 1-5. All authors reviewed the manuscript.

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Correspondence to Md. Abdul Maleque.

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Maleque, M.A., Ferdous, J., Shitel, A.A. et al. Role of shade trees in conserving beneficial arthropods of biocontrol importance in tea ecosystem. Agroforest Syst 98, 21–36 (2024). https://doi.org/10.1007/s10457-023-00886-4

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