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Lethal effects of nano and commercial formulations of abamectin on Tuta absoluta (Meyrick) and its mirid predators Macrolophus pygmaeus and Nesidiocoris tenuis

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Abstract

Nanopesticides are novel formulations that can be applied against a wide range of insect pests as a sustainable alternative to less effective chemical pesticides. Here, acute toxicity of nano (abamectin-PLA-NS (1%) and abamectin-PLA-NS (0.1%)) and commercial formulations of abamectin was evaluated against the South American tomato pinworm, Tuta absoluta, in laboratory and open-field conditions in northeastern Tunisia. Additionally, side effects of nano and commercial formulations of abamectin were also investigated towards the two predatory mirids Macrolophus pygmaeus and Nesidiocoris tenuis either under laboratory or open-field conditions. Laboratory results of acute toxicity revealed no differences between the tested abamectin formulations (against T. absoluta larvae. LC50 values were 0.28, 0.23, and 0.23 for abamectin EC; 0.30, 0.18, and 0.18 for abamectin-PLA-NS (1%) and 0.57, 0.28, and 0.25 for abamectin-PLA- NS (0.1%) corresponding to three time intervals (24, 72 and 120 h after treatment). Abamectin EC, abamectin-PLA-NS (1%) and abamectin-PLA-NS (0.1%) applied at higher doses (0.6 mL/L and 1.2 mL/L) showed higher efficacy percentages (> 90%) in controlling T. absoluta larvae, fourteen days after treatment in open-field tomatoes. Commercial abamectin formulation showed higher toxicity toward M. pygmaeus adults and N. tenuis nymphs compared to nano formulations applied at the two aforementioned doses. High mortality rates, reaching 100%, were reported for M. pygmaeus adults exposed to 1 and 3 day-old residues for commercial formulation at 0.6 mL/L and 1.2 mL/L in laboratory conditions. However, in open-field tomatoes, low acute toxicity was induced by abamectin-PLA-NS (0.1%), ranging from 25 to 41.17%, compared to abamectin EC, ranging from 58.33 to 94.11%, and abamectin-PLA-NS (1%), ranging from 58.33 to 76.47%, at 0.6 mL/L against N. tenuis nymphs at apical leaves. For middle leaves, only abamectin-PLA-NS (0.1%) applied at 0.3 mL/L did not show significant toxicity against N. tenuis nymphs with low mortality level up to 7%, fourteen days after treatment. The practical implications of these results for enhancing integrated pest management programs of T. absoluta in tomatoes are discussed herein.

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Acknowledgements

The authors thank the farmers for their valuable contribution to this work.

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Asma Cherif: Conceptualization, methodology, technical and material supports, Resources, performing experiments, formal analysis, investigation, validation, writing the original draft. Ramzi Mansour: Conceptualization, Resources, formal analysis, investigation, supervision, validation, writing, review, editing. Changjiao Sun: Technical and material supports, Resources, validation. Kaouthar Grissa-Lebdi: Conceptualization, methodology, technical and material supports, Resources, supervision, validation.

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Correspondence to Asma Cherif.

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Cherif, A., Mansour, R., Sun, C. et al. Lethal effects of nano and commercial formulations of abamectin on Tuta absoluta (Meyrick) and its mirid predators Macrolophus pygmaeus and Nesidiocoris tenuis. Int J Trop Insect Sci 42, 2183–2193 (2022). https://doi.org/10.1007/s42690-022-00739-0

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  • DOI: https://doi.org/10.1007/s42690-022-00739-0

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