Effectiveness of Profume® gas fumigant (sulfuryl fluoride) for the control of phosphine-resistant grain insects infesting stored wheat


Abstract: Highly phosphine-resistant populations of Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae) and Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) have been found in Oklahoma grain storage facilities. The phosphine-resistant R. dominica and T. castaneum populations found are up to 1,519 and 119 times, respectively, more resistant than their susceptible counterparts. These findings call for development of phosphine resistance management strategies to ensure continued effective use of phosphine. Eliminating highly phosphine-resistant insects using an alternative fumigant such as Profume® gas (sulfuryl fluoride or SF) can be a component of phosphine resistance management. Therefore, we conducted an experiment in eight 13.6-MT steel bins to determine the efficacy of SF to control phosphine-resistant R. dominica and T. castaneum infesting stored wheat. Based on our data, SF was highly effective in controlling all stages of phosphine resistant R. dominica and T. castaneum. The effectiveness of SF to control phosphine-resistant insects and implications of this for resistance management are discussed.

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