The efficacy of ethyl formate (EF) against insect pests on barley, oat and rape grains was evaluated. EF at 90 g/t was applied as a solution of ethyl formate in water (4%, w/w) and sprayed onto rape and oat grains during inloading. For barley, EF solution was sprayed into the inloading chute. Intergranular concentrations of EF declined rapidly after fumigation. Residue levels in commodities declined to the control (untreated) level within 4 weeks at grain temperatures of approximately 20C without forced aeration. Air samples were taken at head height at various distances downwind from the base of the silos during fumigation and outloading. The levels of EF measured were
