Alerts
Improved monitoring of methyl bromide fumigations for perishable plant products
Effective from 25 May 2017Who does this alert affect?
Class 12.1 Onshore Fumigation Approved Arrangements, brokers and importers of perishable plant products (cut flowers, fresh produce and nursery stock).
Background
Methyl bromide fumigation is an essential treatment option in the effective management of invertebrate pests detected on imported perishable plant products.
A recent period of post-fumigation inspections on infested consignments of cut flowers and fresh produce has raised concerns about the effectiveness of current fumigation practices. The department is concerned that the required concentration of fumigant may not be penetrating the entire consignment for the required amount of time to achieve effective pest control. This could be due to the tight packing of products particularly those with plastic sleeves.
The correct placement of gas monitoring tubes is a critical step to ensure that the required gas concentration has been achieved throughout the target of the fumigation for the prescribed time.
What has changed?
Effective immediately, the department requires all fumigations of fresh produce, cut flowers and foliage and nursery stock to be monitored by three gas monitoring tubes placed within the target product and packaging.
At least one monitoring tube must be placed in the area which is most difficult for the fumigant to reach. This will generally be in the centre of a package in the centre of the consignment. i.e. for cut flowers – within a plastic sleeve in a flower bunch in the centre of the centre carton; for other products - in the centre of the centre carton.
To implement this change the department will include the following text on all fumigation directions for perishable plant products:
Cut flowers
Ensure an 80% retention rate using three gas monitoring tubes placed within flower bunches in selected cartons. At least one tube must be placed in the area hardest for the fumigant to penetrate i.e. within a flower bunch in the centre of the centre carton
Fresh Produce and Nursery Stock
Three gas monitoring tubes must be placed within the commodity in selected cartons. At least one tube must be placed in the area hardest for the fumigant to penetrate i.e. in the centre of the centre carton.
How will this affect you?
Placement of gas monitoring tubes within the commodity may increase the time it takes for all monitoring points to reach the required methyl bromide concentration in order to commence the fumigation exposure period. To minimise this, the department recommends that fumigators prepare and stack consignments to improve fumigant circulation and penetration. This may include removal of lids, loosening flower bunches and air stacking cartons with the lids off.
NOTE: The preparation of consignments for fumigation must be conducted in a secure enclosure such as within the fumigation chamber. This preparation must not be conducted in an open area that would allow the escape of pests from the cartons.
Further information
For additional information you can email Plant Import Operations Branch at Imports@agriculture.gov.au or phone 1800 900 090.
This Alert applies to the following Cases:
- Saintpaulia spp. for use as nursery stock
- Orchids for use as nursery stock
- Bromeliads for use as nursery stock
- Methyl bromide sensitive nursery stock
- Methyl bromide sensitive nursery stock that are hosts of Xylella fastidiosa
- Zantedeschia spp. (Calla lily) for use as nursery stock
- Sudden oak death hosts for use as nursery stock
- Rosa spp. for use as nursery stock
- Allium sativum for use as nursery stock
- Fresh pineapple for human consumption
- Chrysanthemum x morifolium for use as nursery stock
- Daylily rust hosts for use as nursery stock
- Aquatic plants for use as nursery stock
- Allium porrum for use as nursery stock
- Agathis spp. for use as nursery stock
- Eustoma, Lisianthius, Bilamista, Lobelia and Urananthus for use as nursery stock
- Dianthus caryophyllus for use as nursery stock
- Guava rust hosts for use as nursery stock
- Daphne spp. and Gladiolus spp. for use as nursery stock
- Hypericum x inodorum for use as nursery stock
- Ornamental virus hosts and Xylella fastidiosa hosts for use as nursery stock
- Fresh root vegetables for human consumption
- Hibiscus spp for use as nursery stock
- Xylella fastidiosa hosts for use as nursery stock
- Medium risk plants for use as nursery stock
- Xylella fastidiosa and sudden oak death hosts for use as nursery stock
- Fresh kiwifruit for human consumption
- Cacti for use as nursery stock
- Rhapis spp. for use as nursery stock
- Fresh cut flowers and foliage
- Allium ampeloprasum for use as nursery stock
- Mentha spp. for use as nursery stock
- Dracaena sanderiana for use as nursery stock
- Punica spp. for use as nursery stock
- Araucaria spp. for use as nursery stock
- Camellia spp. for use as nursery stock
- Aquatic plants that are hosts of Xylella fastidiosa for use as nursery stock
- Ziziphus jujuba Mill. (Chinese jujube) for use as nursery stock
- Candidatus Liberibacter solanacearum and Xylella fastidiosa hosts for use as nursery stock
- Ornamental virus, Sudden Oak Death and Xylella fastidiosa hosts for use as nursery stock
- Fresh Allium