DPR Non Soil Fumigation Practice Test

Bulk stored grain needs a fumigant that can be released inside a sealed grain mass and diffuse through the kernels to reach pests throughout the storage. Aluminum phosphide fits this need because it is a solid that reacts with moisture to release phosphine gas directly inside the silo. That gas penetrates the grain mass effectively, delivering control where pests hide inside grains and within the pile. This makes it a practical and widely used option for bulk grain fumigation.

Historically, other fumigants have roles in different settings. Methyl bromide, though highly effective, is being phased out and restricted for environmental reasons, so it isn’t the standard choice for bulk grain today. Sulfuryl fluoride is primarily used for whole-structure fumigation of buildings and some commodities, not the typical method for treating dense bulk grain. Chloropicrin acts mainly as a warning agent or as a component in mixtures to enhance efficacy, rather than as the sole fumigant for bulk grain.