Post-harvest jobs to protect stored grain

Post-harvest jobs to protect stored grain

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Application of diatomaceous earth to a silo. Photograph by Chris Warwick.

Application of diatomaceous earth to a silo. Photograph by Chris Warwick.

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“Hygiene is an essential step to ensure grain on-farm is kept ready for market in a safe, insect free environment."

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POST-harvest is the perfect time to do three simple on-farm hygiene jobs to protect stored grain from pests.

Kym McIntyre from the Grain Farm Biosecurity Program said summer was a good time to clean unused grain storage and handling equipment and clear piles of grain residues around the farm.

“Hygiene is an essential step to ensure grain on-farm is kept ready for market in a safe, insect free environment,” Ms McIntyre said.

“For example, it’s important to make sure old grain residues are not left piled up on your farm.

“Storage pests will breed in these piles and may fly up to one kilometre back to stored grain and infest it again.

“To prevent this, bury, burn or spread out the residues in the paddock to less than 20 millimetres deep.”

When it comes to unused storage facilities, Philip Burrill from the National Stored Grain Extension Program said the first step was to clean out all grain residues.

“You can then apply structural treatments to the empty storage such as diatomaceous earth (DE), commonly known as Dryacide,” Mr Burrill said.

“DE can provide a non-chemical option for a structural treatment and it only requires a very fine layer along the inside surfaces of the silo.

“The fine hard particles of the DE get into the joints of the insect, irritating their waxy exoskeleton and causing them to die of dehydration.”

Mr Burrill also emphasised that it was important to clean any grain handling equipment as grain left behind in the equipment provided an ideal place for insects to breed between harvests.

A trial done in Queensland found that a header thought to be clean at the end of the previous year had more than 1000 lesser grain borer insects in the first 40 litres of grain to run through it at the start of harvest.

“This shows how a small amount of grain residue can allow insects to breed and subsequently infest freshly harvested grain,” Mr Burrill said.

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As it’s impossible to remove all the grain residues from equipment without a major overhaul he recommended putting a small amount of DE into the harvester or handling equipment.

“Run the machine for a few minutes to distribute it through,” Mr Burrill said.

“Ideally, this should be done after harvest and again one month prior to the next harvest.”

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