The Grains Research and Development Corporation's Grain Storage Extension Project team has developed a set of guidelines to support growers in adhering to fumigation best practice.
Grain storage expert Philip Burrill said correct fumigation of grain in storage was "non-negotiable."
"It is not onerous for growers to implement best practice, yet the implications of poor practice can be extremely costly," he said.
Examples of good practices to reduce phosphine residue causing rejection of deliveries include checking grain in storage for pests and quality monthly and keeping up-to-date records.
Planning ahead for grain fumigations and having clear procedures on how fumigation and venting is to be undertaken is also advised.
Examples of poor practices include fumigating in the truck, mixing tablets in with the grain and adding water to tablets.
More information on effective treatment of grain in storage is available on the GRDC Stored Grain Information Hub.
Growers unclear of best practices can contact the team on 1800 WEEVIL or attend a storage workshop.