Virginia Commercial Pesticide
Applicator Category 1C Fumigation of
Soil and Agricultural Commodities
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. What is the primary objective of soil fumigation in agricultural
settings?
A. To improve soil structure
B. To control soilborne pests
C. To increase soil pH
D. To add organic matter
Soil fumigation is primarily used to control soilborne pests including
nematodes, fungi, weeds, and insects before planting.
2. Which gas is most commonly used for structural fumigation but not
recommended for soil fumigation due to phytotoxicity?
A. Sulfuryl fluoride
B. Methyl bromide
C. Phosphine
, D. Chloropicrin
Phosphine is primarily used for commodity fumigation, not for soil
fumigation, due to risks and limited efficacy in soil pest control.
3. Prior to soil fumigation, what is the critical step to maximize fumigant
efficacy?
A. Increase irrigation
B. Reduce soil compaction
C. Till and prepare the soil
D. Apply lime
Tilling and preparing the soil ensures good fumigant distribution and
contact with pest habitats.
4. What factor most influences fumigant movement through soil?
A. Soil color
B. Soil texture and moisture
C. Ambient humidity
D. Crop species
Soil texture and moisture significantly affect fumigant diffusion and
pest control efficacy.
5. What is the minimum buffer zone required by Virginia regulations for
most soil fumigations?
A. 10 feet
B. 100 feet
C. 500 feet
D. No buffer required
Virginia regulations typically require a 100-foot buffer to protect
bystanders and sensitive sites unless specific conditions allow
reduction.
6. Which of these conditions increases fumigant volatilization and loss to
the atmosphere?
, A. High clay content
B. Soil saturation
C. High soil temperature
D. Tarping properly
High soil temperature accelerates fumigant volatilization, reducing
pest control effectiveness.
7. What is the purpose of a fumigation tarp?
A. To add nutrients
B. To reduce water loss
C. To contain fumigant gas in soil
D. To shade crops
Tarping helps trap fumigant gases in the soil to improve pest control
and reduce emissions.
8. Which label requirement must be followed for all pesticide fumigants?
A. Ignore wind speed
B. Follow all application rate directions
C. Apply at any time of day
D. Use without protective equipment
Fumigants must be applied according to label application rates to
ensure safety and efficacy.
9. What is a major human health risk associated with methyl bromide
exposure?
A. Hypertension
B. Neurological effects
C. Diabetes
D. Hypothermia
Methyl bromide can cause neurological symptoms including
dizziness, headaches, and seizures with exposure.
Applicator Category 1C Fumigation of
Soil and Agricultural Commodities
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. What is the primary objective of soil fumigation in agricultural
settings?
A. To improve soil structure
B. To control soilborne pests
C. To increase soil pH
D. To add organic matter
Soil fumigation is primarily used to control soilborne pests including
nematodes, fungi, weeds, and insects before planting.
2. Which gas is most commonly used for structural fumigation but not
recommended for soil fumigation due to phytotoxicity?
A. Sulfuryl fluoride
B. Methyl bromide
C. Phosphine
, D. Chloropicrin
Phosphine is primarily used for commodity fumigation, not for soil
fumigation, due to risks and limited efficacy in soil pest control.
3. Prior to soil fumigation, what is the critical step to maximize fumigant
efficacy?
A. Increase irrigation
B. Reduce soil compaction
C. Till and prepare the soil
D. Apply lime
Tilling and preparing the soil ensures good fumigant distribution and
contact with pest habitats.
4. What factor most influences fumigant movement through soil?
A. Soil color
B. Soil texture and moisture
C. Ambient humidity
D. Crop species
Soil texture and moisture significantly affect fumigant diffusion and
pest control efficacy.
5. What is the minimum buffer zone required by Virginia regulations for
most soil fumigations?
A. 10 feet
B. 100 feet
C. 500 feet
D. No buffer required
Virginia regulations typically require a 100-foot buffer to protect
bystanders and sensitive sites unless specific conditions allow
reduction.
6. Which of these conditions increases fumigant volatilization and loss to
the atmosphere?
, A. High clay content
B. Soil saturation
C. High soil temperature
D. Tarping properly
High soil temperature accelerates fumigant volatilization, reducing
pest control effectiveness.
7. What is the purpose of a fumigation tarp?
A. To add nutrients
B. To reduce water loss
C. To contain fumigant gas in soil
D. To shade crops
Tarping helps trap fumigant gases in the soil to improve pest control
and reduce emissions.
8. Which label requirement must be followed for all pesticide fumigants?
A. Ignore wind speed
B. Follow all application rate directions
C. Apply at any time of day
D. Use without protective equipment
Fumigants must be applied according to label application rates to
ensure safety and efficacy.
9. What is a major human health risk associated with methyl bromide
exposure?
A. Hypertension
B. Neurological effects
C. Diabetes
D. Hypothermia
Methyl bromide can cause neurological symptoms including
dizziness, headaches, and seizures with exposure.
