Liquid ethyl formate (EF, purity: 97%) was purchased from Sigma Aldrich Co. (St. Louis, MO, USA). For efficacy trials, liquid EF was applied on a filter paper (90 mm dia., Whatman, Inc., Buckinghamshire, UK) for vaporization. For the scaled up (1.0 m3) trials, the liquid EF was vaporized using a prototype EF vaporizer (Safefume Inc., Daegu, Republic of Korea) and EF gas was propelled into the fumigation chamber using nitrogen gas from a cylinder [39 (link)].
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