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◆ Warning signs
The chamber operator is responsible for supplying the above materials
as well as ensuring that the chamber is certified for conducting PPQ
quarantine treatments.
Conducting the Fumigation
Step 1—Selecting a Treatment Schedule
Select an appropriate treatment schedule to effectively eliminate the
plant pest without damaging the commodity to be fumigated.
Turn to the treatment schedule Index and look up by commodity or by
pest the treatment schedule(s) available. Treatment schedules which
are approved for chambers will be listed as either “NAP” (normal
atmospheric pressure) or as “vacuum.”
Step 2—Determining Section 18 Exemptions and Sampling
Requirements
After selecting the treatment schedule, you will be able to determine
which treatment schedules are FIFRA Section 18 Exemptions by the
presence of broad, bold lines on the border of the treatment schedule
table. Some treatment schedules are Section 18 Exemptions only at
specific temperature ranges. Check the treatment schedule and
temperature to determine if the fumigation will be a Section 18
1 You will need to bring these items unless the chamber is operated by PPQ, in which case all materials are
provided by PPQ.
Chemical Treatments Fumigants • Methyl Bromide • Chamber Fumigation
Conducting the Fumigation
10/2002-04 Treatment Manual 2-5-3
PPQ
Exemption. Once you’ve determined that a treatment schedule is a
Section 18 Exemption, look in the far right column of the table to
determine if a sample is required. If a sample is required, you must
take a sample prior to the start and another after the aeration. See
instructions in the section tabbed “Monitoring.”
Step 3—Measuring the Temperature
Determine the temperature to use in selecting the proper dosage rate:
◆ For fruits, pulpy vegetables, or logs use only the commodity
temperature.
◆ For all other commodities use both the commodity and air
temperature.
To take the temperature readings, use a bimetallic, mercury, or digital
long-stem thermometer that has been calibrated. Use Table 2-5-1 to
determine which temperature to use when selecting the proper dosage
rate for commodities other than fresh fruits, vegetables, or logs.
Record the temperatures in Block 22 of the PPQ Form 429.
Step 4—Calculating the Dosage
In order to calculate dosage, you must have the following information:
◆ Treatment schedule
◆ Volume of the fumigation chamber (ft3)
◆ Temperatures of commodity and air ( °F)
Important
Commodity and space temperatures must be 40 °F or above.
TABLE 2-5-1: Determine Whether to Use Commodity or Air Temperature for
Determining Dosage Rate
If the air temperature
is: And:
Then, for commodities other than fresh
fruits or vegetables or logs and lumber1:
1 Use commodity temperature for fresh fruits or vegetables or logs and lumber.
Higher than the
commodity temperature
Use the commodity temperature for
determining the dosage rate
Lower than the
commodity temperature
By 9 degrees or
less
By 10 degrees or
more
Use the average of the air and commodity
temperature for determining the dosage
rate
Chemical Treatments Fumigants • Methyl Bromide • Chamber Fumigation
Aerating the Chamber
2-5-4 Treatment Manual 10/2002-04
PPQ
Refer to the specific treatment schedule to determine the dosage rate
(pounds/ft3).
The formula for calculating dosage is:
EXAMPLE: Using a fumigation chamber which has a volume of 500 ft3,
you determine the temperature of the commodity and space is 72 °F.
The treatment schedule requires 2 lbs. MB/1,000 ft3 at 70 °F or above.
To calculate dosage multiply the volume (500 ft3) by the dosage rate (2
lbs. MB/1,000 ft3). This equals 1.0 lbs. of MB needed for the dosage.
Step 5—Conducting the Fumigation
Since fumigation chambers vary by manufacturer and model, refer to
the manufacturer’s operating manual to determine how to use the
chamber. However, in any case, circulation fans in a chamber should
be kept running for 15 minutes following introduction of the gas.
Aerating the Chamber
Responsibility for aerating the chamber and releasing the commodity
depends on whether the treatment schedule used was a labelled use
or FIFRA Section 18 Exemption. Use the following table to determine
responsibility for monitoring the aeration of the fumigation.
Use the following table to determine which procedures to follow for
aerating normal atmospheric pressure (NAP) and vacuum chambers.
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