Wood and Bark chips not from tropical plantation grown trees require either fumigation (T404-b-1-1) or kiln sterilisation (T404-b-4) treatment.
Consignments must be fumigated with methyl bromide as per T404-b-1-1 of the USDA Treatment Manual:
T404-b-1-1 Methyl bromide at NAP:
| Dosage rate (grm/m3) | Temperature (degrees Celsius) | Exposure period (hours) |
| 48 | 21 or above | 16 |
| 80 | 5 - 20 | 16 |
The following minimum concentration readings are required for each fumigation.
T404-b-1-1 – Minimum concentration readings
| Dosage rate (grm/m3) | Temperature (degrees Celsius) | Minimum concentration readings (grm/m3) at: | | | |
| | | 0.5 hr | 2 hrs | 4 hrs | 16 hrs |
| 48 | 21 or above | 36 | 30 | 27 | 25 |
| 80 | 5 - 20 | 60 | 51 | 48 | 42 |
If the fumigation is conducted in a closed-door container then:
- take the first reading at 1 hour instead of 0.5 hours;
- take the second reading at 2.5 hours instead of 2 hours.
If the 4 and 16 hour readings would occur outside of normal working hours, then the fumigation may be extended to a total of 24 hours, instead of 16. In that case, the 24-hr minimum concentration reading would be 25 (for the initial 48grm/m3 dosage), or 42 (for the initial 80 grm/m3 dosage).
OR
Consignments must be kiln dried as per T404-b-4 of the USDA Treatment Manual:
T404-b-4—Kiln Sterilisation
| Dry bulb temperature (degrees Celsius) | Wet bulk drepression (degrees Celsuis) | Relative Humidity (%) | Moisture Content (%) | Thickness of lumber (Inches) | Treatment time after kiln reaches conditions (Hours) |
| 60 | -13.9 | 82 | 13.8 | 1
2
3 | 3
5
7 |
| 54.5 | -8.9 | 60 | 9.4 | 1
2
3 | 10
12
14 |
| 52 | -9.4 | 61 | 9.7 | 1
2
3 | 46
48
50 |
The exporter is to provide evidence attesting to the treatment and present it to the Authorised Officer at the time of inspection.
Details of treatment to be endorsed on the phytosanitary certificate in the treatment section.
