Fumigation trials with a mixture of methyl bromide and carbon dioxide in vertical bins

Abstract

The efficacy of a fumigant mixture containing methyl bromide and carbon dioxide was examined using the gravity penetration method in vertical bins of wheat. When applied as the mixture methyl bromide penetrated to the bottom of the bins and complete control of test insects at the base of the bins as well as the existing natural infestation was obtained. Methyl bromide applied alone under similar conditions was not detected at the bottom of the bins and the insects of the natural infestation, and test insects remained alive. It is assumed the carbon dioxide acted as a carrier and facilitated the penetration of the methyl bromide to the depth of 17 m through the grain bulk.