📅 March 2026 · ⏱ 5 min read · BSiO₂ Pty Ltd
Australia produces more than 50 million tonnes of grain annually — wheat, barley, sorghum, chickpeas, canola, and more. Protecting stored grain from insect pests is one of the most economically significant challenges in the entire supply chain. Left untreated, stored grain can suffer losses of 20–40% from insect infestation within months.
The most common culprits are the grain weevil (Sitophilus granarius), the lesser grain borer, the rice weevil, flat grain beetles, and moth species including the Indian meal moth. In warm, humid conditions — exactly the conditions across Far North and Central Queensland — these pests multiply rapidly.
Concerns about chemical residues in exported grain, resistance development in pest populations, and the shift toward chemical-free supply chains have created strong demand for natural, residue-free alternatives. Diatomaceous earth is the most proven and widely adopted of those natural alternatives.
DE does not rely on toxicity to kill insects. It works entirely through a mechanical mode of action. DE particles have microscopic sharp edges derived from the intricate silica skeletons of fossilised diatom algae. When grain insects contact DE, those edges abrade the protective waxy layer (the epicuticle) of the insect's exoskeleton. Once compromised, the insect cannot retain moisture and dies from dehydration — typically within 24–72 hours depending on temperature and humidity.
This is arguably the most important practical advantage of DE over synthetic insecticides. Because DE kills insects through a purely physical mechanism, insects cannot develop resistance. There is no chemical compound for their biology to adapt to. The same product that worked in 1960 works identically today.
By contrast, resistance to synthetic grain protectants like malathion has been documented in grain weevil and lesser grain borer populations across Australia and globally. DE eliminates this challenge entirely, making it an excellent long-term foundation for any integrated pest management (IPM) program.
DE must make physical contact with pest insects to be effective — which requires thorough mixing throughout the grain mass. There are three main application methods:
Introduce DE into the grain stream as it passes through the auger during filling. The conveying action provides thorough mixing. Most practical for large volumes.
Mix DE with a small amount of water to create a slurry and spray onto grain. Useful for on-farm bins. Allow grain to dry fully before sealing.
Apply as a dry dust during conveying or use purpose-built dust applicators on grain elevators. Suitable for smaller volumes.
BSiO₂ Pty Ltd supplies the following grades wholesale in 1 tonne FIBC bulka bags from our Far North Queensland processing depot:
| Grade | Application | Pack Size |
|---|---|---|
| Minus 2 mm | Direct grain application — fine enough for thorough coating of grain surfaces | 1 tonne FIBC bulka bag |
| 400 Micron | Food-grade fine powder — maximum surface area contact per kg applied | 1 tonne FIBC bulka bag |
BSiO₂'s processing depot is on the Kennedy Highway in Far North Queensland — supplying grain storage operators across the Atherton Tablelands, Darling Downs, and the broader Queensland grain belt. Freight available across East Coast Australia, Darwin, and South Australia.
Contact Richard West for pricing on food-grade diatomaceous earth for grain storage applications.
