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Post-Harvest Chemicals

Post-Harvest Chemicals

Chemical Usage and Outturn Tolerances Document 2020/21

The document outlines permitted chemicals for use post-harvest and applicable Maximum Residue Limits (MRL) for grain outturned to the Australian domestic or export markets. The MRLs apply for grain outturned during the 2020/21 season.

The most common treatments are either fumigants or grain protectants. For approved labels of each product, refer to the APVMA PubCRIS website.

Industry is encouraged to familiarise themselves with this document to ensure Australian grain continues to comply with market requirements for chemical residues.

The document should be referred to when marketing Australian grain to assist industry in adhering to the Maximum Residue Limits (MRLs). It is referred to in a number of GTA publications. Industry is advised this is the latest version and supersedes all prior versions.

To review the Chemical Usage and Outturn Tolerances Document 2020/2021 click here 

For any enquiries relating to this document, please email the Chair NWPGP at gerardmcmullen@optusnet.com.au  

A relatively limited number of grain protectants are available for use to control stored grain insects in grain held in storage. Insect resistance and market perceptions/restrictions are also further limiting the availability and use of those chemicals.

When using grain protectants a range of issues need to be considered, including:

  • Market requirements (MRLs)
  • Storage type
  • Insect resistance
  • Many other factors

For the most commonly available grain protectants, a range of factors determine the expected half-life of those chemicals. The following table outlines the half-life based on specific temperature and humidity conditions, which alter over time and thus the information is general only*:

* Ex Pure & Appl. Chem., Vol. 66, No. 2, pp. 335-356, 1994. INTERNATIONAL UNION OF PURE AND APPLIED CHEMISTRY “EFFECTS OF STORAGE AND PROCESSING ON PESTICIDE RESIDUES IN PLANT PRODUCTS” (Technical Report) Prepared for publication by P. T. HOLLAND, D. HAMILTON, B. OHLIN and M. W. SKIDMORE

Strategy to Manage Insect Resistance to Grain Protection Chemicals

The goal of the strategy is to ensure the long-term sustainability of phosphine and other grain protection chemicals through the strategic adoption and implementation of commercially viable, practical, scientifically-based management strategies to control insects.

The previous Phosphine Resistance Management Strategy is now termed “Strategy to Manage Insect Resistance to Grain Protection Chemicals”. It now includes all grain protectant chemicals and outlines a range of measures to combat insects through various chemical and non-chemical means. Industry is encouraged to implement the revised Strategy for the longer term sustainability of our industry.

The latest strategy document for industry use is available here 

GRDC Stored Grain website

The GRDC operates a Stored Grain information hub website for use by all stakeholders along the value chain. The website has a focus on provision of material for the stored grain sector, relevant to the on-farm storage sector and the ex-farm gate Bulk Handling Company sector.

Information available includes a range of material relevant to storage of grain and post-harvest chemical use, such as the latest grain storage and structural treatments, and can be accessed here