However, a NSW-based company is urging those storing grain to turn to a natural product that has been available for 20 years, and uses a blend of chalk-like earth that kills insects through dehydration.

The treatment, Dryacide Grain Protectant, distributed by pest control business Entosol, works through the dust of the protectant absorbing the natural oils and waxes from the insect’s cuticle, causing it to dehydrate.

Entosol managing director Roger Allanson said the product had been on the market for around 20 years, and had waxed and waned in popularity over time.

“Currently, with all the resistance problems, DPI grain storage experts are recommending the product as a way to break up that chemical cycle,” he said.

Mr Allanson said the treatment would provide a valuable way for farmers storing grain on-farm to break the cycle of ever-increasing chemical rates, and cut chemical residues in stored grain.

He claims the treatment will keep grain free of insect infestation for a year, including insects resistant to conventional grain treatments.

The product is said to be unaffected by high or low temperatures, which Mr Allanson claimed means it will provide consistent long-term protection.

Logistically, Dryacide can be applied either as a dry powder or as an aqueous dust deposit. Once dried, the water-based slurry on the storage wall retains it insecticidal activity.

The other management benefit is that there is no withholding period, so the grain can be used whenever needed.

Mr Allanson said that the product could help grain storers make considerable savings when compared with conventional chemical applications.