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Acute effect of low-dose thiacloprid exposure synergised by tebuconazole in a parasitoid wasp

(2019) PLOS ONE. 14(2).
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Abstract
Agricultural practices often involve tank-mixing and co-application of insecticides with fungicides to control crop pests. However, natural methods relying on biological control agents such as hymenopteran parasitoids have been shown to be highly effective in suppressing crop pest populations. The current body of insecticide risk assessment data accounting for fungicide co-application is very small, the present study being the first to examine this in a parasitoid wasp. Through low-dose exposure to dry residues of the neonicotinoid insecticide thiacloprid, we examined its mortal and knockdown effect on Aphelinus abdominalis when co-applied with increasing doses of the fungicide tebuconazole. Both of these acute effects of thiacloprid were synergised (toxicity increased to a greater-than-additive effect) by tebuconazole, resulting in significant mortality from low-dose co-applications of tebuconazole, and significant knockdown even without co-applied tebuconazole, the effect increasing as tebuconazole concentration increased. We show the highly toxic effect that a low dose of thiacloprid imposes on A. abdominalis populations, and a synergistic toxicity when co-applied with low doses of tebuconazole. Our work suggests a need for updating pesticide risk assessment methods, accounting for pesticide mixtures, in order to make these risk assessments more field relevant.
Keywords
ERETMOCERUS-MUNDUS, BIOLOGICAL-CONTROL, HYMENOPTERA, INSECTICIDES, PESTICIDES, DELTAMETHRIN, LEPIDOPTERA, POPULATIONS, EULOPHIDAE, FUNGICIDES

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MLA
Willow, Jonathan et al. “Acute Effect of Low-dose Thiacloprid Exposure Synergised by Tebuconazole in a Parasitoid Wasp.” PLOS ONE 14.2 (2019): n. pag. Print.
APA
Willow, J., Silva, A., Veromann, E., & Smagghe, G. (2019). Acute effect of low-dose thiacloprid exposure synergised by tebuconazole in a parasitoid wasp. PLOS ONE, 14(2).
Chicago author-date
Willow, Jonathan, Ana Silva, Eve Veromann, and Guy Smagghe. 2019. “Acute Effect of Low-dose Thiacloprid Exposure Synergised by Tebuconazole in a Parasitoid Wasp.” Plos One 14 (2).
Chicago author-date (all authors)
Willow, Jonathan, Ana Silva, Eve Veromann, and Guy Smagghe. 2019. “Acute Effect of Low-dose Thiacloprid Exposure Synergised by Tebuconazole in a Parasitoid Wasp.” Plos One 14 (2).
Vancouver
1.
Willow J, Silva A, Veromann E, Smagghe G. Acute effect of low-dose thiacloprid exposure synergised by tebuconazole in a parasitoid wasp. PLOS ONE. 2019;14(2).
IEEE
[1]
J. Willow, A. Silva, E. Veromann, and G. Smagghe, “Acute effect of low-dose thiacloprid exposure synergised by tebuconazole in a parasitoid wasp,” PLOS ONE, vol. 14, no. 2, 2019.
@article{8618242,
  abstract     = {Agricultural practices often involve tank-mixing and co-application of insecticides with fungicides to control crop pests. However, natural methods relying on biological control agents such as hymenopteran parasitoids have been shown to be highly effective in suppressing crop pest populations. The current body of insecticide risk assessment data accounting for fungicide co-application is very small, the present study being the first to examine this in a parasitoid wasp. Through low-dose exposure to dry residues of the neonicotinoid insecticide thiacloprid, we examined its mortal and knockdown effect on Aphelinus abdominalis when co-applied with increasing doses of the fungicide tebuconazole. Both of these acute effects of thiacloprid were synergised (toxicity increased to a greater-than-additive effect) by tebuconazole, resulting in significant mortality from low-dose co-applications of tebuconazole, and significant knockdown even without co-applied tebuconazole, the effect increasing as tebuconazole concentration increased. We show the highly toxic effect that a low dose of thiacloprid imposes on A. abdominalis populations, and a synergistic toxicity when co-applied with low doses of tebuconazole. Our work suggests a need for updating pesticide risk assessment methods, accounting for pesticide mixtures, in order to make these risk assessments more field relevant.},
  articleno    = {e0212456},
  author       = {Willow, Jonathan and Silva, Ana and Veromann, Eve and Smagghe, Guy},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  keywords     = {ERETMOCERUS-MUNDUS,BIOLOGICAL-CONTROL,HYMENOPTERA,INSECTICIDES,PESTICIDES,DELTAMETHRIN,LEPIDOPTERA,POPULATIONS,EULOPHIDAE,FUNGICIDES},
  language     = {eng},
  number       = {2},
  pages        = {13},
  title        = {Acute effect of low-dose thiacloprid exposure synergised by tebuconazole in a parasitoid wasp},
  url          = {http://dx.doi.org/10.1371/journal.pone.0212456},
  volume       = {14},
  year         = {2019},
}

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