Mice are causing damage to crops in northern NSW and southern Queensland.
Canola shapes up to be the biggest loser from the late August frosts in NSW, with yields likely to be hard hit.
AgForce grains president Wayne Newton said much of Queensland's crops are struggling under dry conditions and frosts.
Growers are questioning whether the current end point royalty system paid to seed companies for their varieties represents good value.
Russian wheat aphid was discovered in Australia last year. Officials are warning the lessons learnt then may not apply this year.
Wheat and barley may be shipped from South Australia to southern Qld and northern NSW in the coming months to ease grain shortages.