Fumigation

 

EPA "TRED&RED" Good


The following proposed changes were considered necessary due to concerns about the efficacy of the MB fumigation schedule in Annex I of ISPM-15.

The current schedule is in the table below:

table 1

Currently the minimum temperature should not be less than 110C and the minimum exposure time should be 16 hours. The proposed revision is in the table below (with changes in red and underlined):

table 2

The minimum temperature should not be less than 10° C and the minimum exposure time should be 24 hours.

As part of the Fast Track Process, a proposed revision is subjected to a 100-day comment period. If no formal objections are received, the standard is included on the agenda of the next scheduled ICPM plenary session for adoption without discussion. If one or more formal objections are received during the comment period, the IPPC Secretariat tries to resolve the issue(s) with the country(ies) concerned, and if these issues are resolved without change to the draft text, the standard is submitted to the ICPM for adoption without discussion.

A number of comments were received on the proposed revision. These can generally be summarized as follows:

  • Several respondents wanted assurances that WPM treated under the existing fumigation protocol would not need to be re-treated if the proposed protocol is adopted. (Bolivia, Brazil, Chile, Paraguay, Uruguay)
  • Respondents were in favor of the proposed protocol with respect to providing more protection against the pinewood nematode. (Bolivia, Brazil, Chile, Paraguay, Uruguay)
  • Some respondents wanted the number of monitoring intervals reduced. (Indonesia, Malaysia, Nepal, Japan)
  • There was interest in providing supporting text to describe how to use the table. (Indonesia, Malaysia, Nepal, Japan)
  • Respondents were concerned that it is difficult to achieve the proposed gas concentrations at the end of 24-hour treatment, particularly if fumigation is carried out under a tarpaulin sheet (which is common in many countries) even though adequate safeguards have been put in place to ensure gas tightness of the enclosure. (Indonesia, Malaysia, Nepal, Australia)
  • One country proposed reduced minimum concentrations at each time interval. (Thailand)
  • One country argued against lowering the temperature from 11°C to 10°C at the lowest temperature range. (Canada)
  • One country argued that effective control of Asian Longhorned Beetle larvae is only achieved at dosage rates of 80g/m3 (or above) at greater than 20°C for 24 hours. (Australia)
  • One country suggests that the size, state (e.g., green wood), and type (e.g., softwood or hardwood) of the timber needs to be addressed. (Australia) The process appears to currently be in the stage of resolving the issues put forth by the countries that responded during the comment period.

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