Potential use of ethyl formate treatment to control surface pests of ‘Hass’ avocado fruit

  • Paul P.B. Pidakala Plant & Food Research
  • Reuben T. Wilkinson Plant & Food Research
  • Agam Nangul
  • Dominic E. Hartnett Plant & Food Research
  • Natalie E.M. Page-Weir Plant & Food Research
  • Amanda J. Hawthorne Plant & Food Research
  • Lisa E. Jamieson Plant & Food Research
  • Allan B. Woolf Plant & Food Research


Ethyl formate (EF) is a Generally Recognised As Safe (GRAS) alternative to methyl bromide, with potential to control surface pests on New Zealand avocados before export. ‘Hass’ avocados, two-spotted spider mites (TSM) and oleander scale (OS) insects were fumigated with 1.2% EF (240 g VAPORMATE™/m3) at 6°C for 1, 2 or 4 h. Fruit were then stored at 5°C for 3 weeks before external and internal fruit quality assessment. Survival of pest species was assessed 1 or 7 days later. Fumigation with 1.2% EF + 10% CO2 for 2 or 4 h controlled all life stages of non-diapausing TSM and all life stages of OS, apart from crawlers (0.3–0.7% survivorship). Diapausing TSM were harder to control (17% ± 4.8% mortality; 4-h treatment). Ethyl formate treatment resulted in damage to avocado skins (41% ± 5.3%–91% ± 2.0%), and an increase in vascular browning and rots. The EF fumigations of avocado fruit at doses used here have potential to control non-diapausing mites and scale insects, but treated fruit were of unacceptable quality. Future studies could examine whether prior cool storage could reduce fruit damage.


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How to Cite
Pidakala, P., Wilkinson, R., Nangul, A., Hartnett, D., Page-Weir, N., Hawthorne, A., Jamieson, L., & Woolf, A. (2018). Potential use of ethyl formate treatment to control surface pests of ‘Hass’ avocado fruit. New Zealand Plant Protection, 71, 121-128. https://doi.org/10.30843/nzpp.2018.71.135
Vol 71 Crop Pests 2 2018

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