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bromide labels, substitution of the products may result in
non-compliance. Use the Treatment Manual to determine when a “Q”
labeled fumigant must be used:
◆ When the treatment schedule is marked MB, any methyl bromide
fumigant may be used for the fumigation if the commodity is on
the fumigant label.
◆ A few schedules restrict the use of a label based on temperature
range. In this case, the specific temperature range is marked and
noted (“Q” label only).
Always read and follow the “Q label” label and use directions. The “Qlabel”
allows fumigation of certain commodities and pests at sites and
rates that are not allowed under other labels. The label is purposely
flexible to handle unforeseen emergencies and other special situations
formerly covered by FIFRA Section 18 label exemptions.
Although the use of “Q label” fumigants eliminates the requirements
for residue and aeration monitoring, the “Q label” requires fumigations
using the product be conducted under the monitoring of a state or
federal agency. Monitoring does not necessarily require the actual
presence of a regulatory agent during the entire fumigation, but does
mean that the monitoring agent be able to certify that the fumigant
was done in compliance with the label and other requirements.
Important
When the treatment schedule is marked MB (“Q” label only), the fumigation is
restricted to methyl bromide “Q” labels. This restriction is based on the “Q”
label replacement of FIFRA Section 18 exemptions.
Chemical Treatments Fumigants • Methyl Bromide
Leak Detection and Gas Analysis
2-3-4 Treatment Manual 10/2002-04
PPQ
To show that the fumigation using the “Q” label was monitored by a
regulatory agent, the fumigator should record the name, title,
telephone number and mailing address of the monitoring regulatory
agent(s) in his restricted use pesticide application records, even if the
same information is recorded on other documents (e.g., phytosanitary
certificate).
Leak Detection and Gas Analysis
Use a thermal conductivity (T/C) unit to measure gas concentration
levels in tarpaulins and chambers. The halide detector is used
primarily to check for leaks around tarpaulins, chambers, application
equipment, and as a safety device around the fumigation site.
Colorimetric tubes, which are supplied by the fumigator, are used to
measure gas concentration levels during aeration.
During a fumigation, a fumigant is volatilized in a chamber at
atmospheric pressure, a positive pressure is created, which may then
be continuously reduced by leakage of the air-fumigant mixture.
Because PPQ approved chambers must be sufficiently tight to retain
the fumigant during the exposure period, chambers should be tested
for leakage before they are used for fumigation.
Effects of Temperature and Humidity
MB is effective at the same temperatures plants are generally handled
(usually 40 °F and above). In general, increases in temperature give a
corresponding increase in the effectiveness of MB. All treatment
schedule temperatures are listed with the corresponding dosage rate.
Follow the dosage rates listed. A Federal Insecticide, Fungicide, and
Rodenticide Act (FIFRA) Section 3 registration (the labeled rate of MB
provided), or a Section 18 Exemption must be in effect at the time of
treatment.
For live plant material which is actively growing or with leaves,
maintain a high percentage of humidity (above 75 percent) in the
chamber by placing wet sphagnum or excelsior in the chamber or by
wetting the chamber walls and floor. Protect actively growing or
delicate plants from the direct air flow of fans. Do not add any
moisture to the chamber when fumigating seeds. Too much moisture
on the material to be fumigated may prevent the fumigant from
reaching some of the pests.
Chemical Treatments Fumigants • Methyl Bromide
Penetration and Aeration of Boxes and Packages
10/2002-04 Treatment Manual 2-3-5
PPQ
Penetration and Aeration of Boxes and Packages
Plastic Wrappings and Impermeable Papers
Plastic wrappings such as cellophane, films, and shrink wrap, and
papers that are waxed, laminated, or waterproofed are not readily
permeable and must be perforated, removed, or opened before
fumigation. If wrappings are perforated to facilitate fumigation, holes
should be at least 3/16-inch in diameter every 3 square inches or 1/
4-inch in diameter every 4 square inches over the entire surface of the
wrapping. Also acceptable are plastic wraps containing numerous
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