INDIANA COMMERCIAL PESTICIDE APPLICATOR
CATEGORY 7D FUMIGATION PRACTICE
EXAMINATION QUESTIONS AND ANSWERS
QUESTIONS
Question 1
A commercial applicator is preparing to fumigate a 120,000-cubic-foot flour mill with
sulfuryl fluoride. The label specifies a dosage of 12 oz per 1,000 cubic feet for a 24-hour
exposure at normal atmospheric pressure. What is the total amount of fumigant required
for this treatment?
A. 1,200 oz
B. 1,440 oz
C. 1,000 oz
D. 1,600 oz
Correct Answer: B
Explanation: The calculation is (120,000 ÷ 1,000) × 12 oz = 120 × 12 = 1,440 oz. Accurate
dosage calculation is critical for effective pest control and regulatory compliance;
applicators must verify all arithmetic before application.
Question 2
Which of the following fumigants is classified as a restricted-use pesticide and requires the
applicator to hold both a Core certification and Category 7d certification in Indiana?
,A. Carbon dioxide
B. Sulfuryl fluoride
C. Nitrogen gas
D. Ethyl formate
Correct Answer: B
Explanation: Sulfuryl fluoride (Vikane) is a restricted-use fumigant. In Indiana, any private
applicator using restricted-use fumigants must pass both the Core examination and the
Category 7d (Fumigation) examination.
Question 3
During a structural fumigation with sulfuryl fluoride, the gas monitoring device indicates a
concentration of 2.5 ppm in the breathing zone of the structure after the initial aeration
period. What is the appropriate action?
A. Declare the structure safe for reoccupancy
B. Continue aeration and retest until levels are ≤1 ppm
C. Immediately remove all warning signs
D. Proceed with reentry wearing only a dust mask
Correct Answer: B
Explanation: The EPA-established safe reentry limit for sulfuryl fluoride is 1 ppm. If levels
exceed this threshold, continued aeration and retesting are mandatory until concentrations
drop to 1 ppm or less.
Question 4
Aluminum phosphide fumigants release phosphine gas upon exposure to which of the
following?
A. Oxygen only
B. Moisture and acids
C. High temperatures only
D. Ultraviolet light
Correct Answer: B
,Explanation: Aluminum phosphide reacts with moisture from the air, water, acids, and
many other liquids to release phosphine gas, which is extremely toxic and flammable.
Question 5
A certified applicator is supervising a fumigation of a grain storage silo using aluminum
phosphide tablets. What is the most critical safety consideration during this operation?
A. Maintaining proper temperature
B. Ensuring complete sealing of the structure
C. Preventing ignition sources near the fumigation site
D. Using only plastic application tools
Correct Answer: C
Explanation: Phosphine gas is highly flammable and can ignite spontaneously under
certain conditions. Accumulation of phosphine gas in confined spaces creates a
significant fire and explosion hazard.
Question 6
According to federal regulations, what is the minimum distance from which individuals
should be notified before a fumigation application?
A. 100-foot radius
B. 250-meter radius
C. 500-foot radius
D. 1-mile radius
Correct Answer: B
Explanation: The U.S. EPA recommends notifying individuals within a 250-meter radius
before fumigation application to protect public health and ensure awareness of potential
exposure risks.
Question 7
Which statement correctly describes the primary difference between sulfuryl fluoride and
methyl bromide as structural fumigants?
, A. Sulfuryl fluoride is odorless while methyl bromide has a distinct odor
B. Sulfuryl fluoride is not affected by temperature
C. Methyl bromide is completely non-toxic to humans
D. Sulfuryl fluoride requires a shorter exposure time
Correct Answer: A
Explanation: Sulfuryl fluoride is an odorless, colorless gas, whereas methyl bromide has a
slight odor at high concentrations. Both are highly toxic and require strict safety protocols.
Question 8
What is the maximum cumulative dosage for sulfuryl fluoride fumigations at normal
atmospheric pressure (NAP)?
A. 500 oz-h/1000 cubic feet
B. 1000 oz-h/1000 cubic feet
C. 1500 oz-h/1000 cubic feet
D. 2000 oz-h/1000 cubic feet
Correct Answer: C
Explanation: The maximum cumulative dosage for sulfuryl fluoride at normal atmospheric
pressure is 1500 oz-h/1000 cubic feet. For vacuum fumigations, the limit is 200 oz-h/1000
cubic feet.
Question 9
A warehouse manager reports seeing small, reddish-brown beetles with distinctive
markings on the forewings infesting stored grain. These pests are most likely:
A. Rice weevils
B. Stored product moths
C. Flour beetles
D. Grain borers
Correct Answer: C
Explanation: Flour beetles are common storage pests with reddish-brown bodies and
distinctive forewing markings. Proper identification is essential for selecting appropriate
fumigation strategies.
CATEGORY 7D FUMIGATION PRACTICE
EXAMINATION QUESTIONS AND ANSWERS
QUESTIONS
Question 1
A commercial applicator is preparing to fumigate a 120,000-cubic-foot flour mill with
sulfuryl fluoride. The label specifies a dosage of 12 oz per 1,000 cubic feet for a 24-hour
exposure at normal atmospheric pressure. What is the total amount of fumigant required
for this treatment?
A. 1,200 oz
B. 1,440 oz
C. 1,000 oz
D. 1,600 oz
Correct Answer: B
Explanation: The calculation is (120,000 ÷ 1,000) × 12 oz = 120 × 12 = 1,440 oz. Accurate
dosage calculation is critical for effective pest control and regulatory compliance;
applicators must verify all arithmetic before application.
Question 2
Which of the following fumigants is classified as a restricted-use pesticide and requires the
applicator to hold both a Core certification and Category 7d certification in Indiana?
,A. Carbon dioxide
B. Sulfuryl fluoride
C. Nitrogen gas
D. Ethyl formate
Correct Answer: B
Explanation: Sulfuryl fluoride (Vikane) is a restricted-use fumigant. In Indiana, any private
applicator using restricted-use fumigants must pass both the Core examination and the
Category 7d (Fumigation) examination.
Question 3
During a structural fumigation with sulfuryl fluoride, the gas monitoring device indicates a
concentration of 2.5 ppm in the breathing zone of the structure after the initial aeration
period. What is the appropriate action?
A. Declare the structure safe for reoccupancy
B. Continue aeration and retest until levels are ≤1 ppm
C. Immediately remove all warning signs
D. Proceed with reentry wearing only a dust mask
Correct Answer: B
Explanation: The EPA-established safe reentry limit for sulfuryl fluoride is 1 ppm. If levels
exceed this threshold, continued aeration and retesting are mandatory until concentrations
drop to 1 ppm or less.
Question 4
Aluminum phosphide fumigants release phosphine gas upon exposure to which of the
following?
A. Oxygen only
B. Moisture and acids
C. High temperatures only
D. Ultraviolet light
Correct Answer: B
,Explanation: Aluminum phosphide reacts with moisture from the air, water, acids, and
many other liquids to release phosphine gas, which is extremely toxic and flammable.
Question 5
A certified applicator is supervising a fumigation of a grain storage silo using aluminum
phosphide tablets. What is the most critical safety consideration during this operation?
A. Maintaining proper temperature
B. Ensuring complete sealing of the structure
C. Preventing ignition sources near the fumigation site
D. Using only plastic application tools
Correct Answer: C
Explanation: Phosphine gas is highly flammable and can ignite spontaneously under
certain conditions. Accumulation of phosphine gas in confined spaces creates a
significant fire and explosion hazard.
Question 6
According to federal regulations, what is the minimum distance from which individuals
should be notified before a fumigation application?
A. 100-foot radius
B. 250-meter radius
C. 500-foot radius
D. 1-mile radius
Correct Answer: B
Explanation: The U.S. EPA recommends notifying individuals within a 250-meter radius
before fumigation application to protect public health and ensure awareness of potential
exposure risks.
Question 7
Which statement correctly describes the primary difference between sulfuryl fluoride and
methyl bromide as structural fumigants?
, A. Sulfuryl fluoride is odorless while methyl bromide has a distinct odor
B. Sulfuryl fluoride is not affected by temperature
C. Methyl bromide is completely non-toxic to humans
D. Sulfuryl fluoride requires a shorter exposure time
Correct Answer: A
Explanation: Sulfuryl fluoride is an odorless, colorless gas, whereas methyl bromide has a
slight odor at high concentrations. Both are highly toxic and require strict safety protocols.
Question 8
What is the maximum cumulative dosage for sulfuryl fluoride fumigations at normal
atmospheric pressure (NAP)?
A. 500 oz-h/1000 cubic feet
B. 1000 oz-h/1000 cubic feet
C. 1500 oz-h/1000 cubic feet
D. 2000 oz-h/1000 cubic feet
Correct Answer: C
Explanation: The maximum cumulative dosage for sulfuryl fluoride at normal atmospheric
pressure is 1500 oz-h/1000 cubic feet. For vacuum fumigations, the limit is 200 oz-h/1000
cubic feet.
Question 9
A warehouse manager reports seeing small, reddish-brown beetles with distinctive
markings on the forewings infesting stored grain. These pests are most likely:
A. Rice weevils
B. Stored product moths
C. Flour beetles
D. Grain borers
Correct Answer: C
Explanation: Flour beetles are common storage pests with reddish-brown bodies and
distinctive forewing markings. Proper identification is essential for selecting appropriate
fumigation strategies.
