Chicago Commercial Pesticide Applicator
Public Health Pest Control Practice
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. A public health pest is best defined as an organism that
A. damages ornamental plants in public parks
B. transmits disease or otherwise threatens human health
C. competes with humans for food in agricultural settings
D. causes structural damage to public buildings
Answer: B
Rationale: Public health pests are those that can directly or indirectly cause
human disease, injury, or discomfort. While structural or agricultural pests can
have economic impacts, the public health definition centers on disease
transmission, allergenic properties, biting, stinging, or contamination that
endangers human health.
2. In Chicago, which agency has primary authority to regulate commercial
pesticide application for public health pest control?
A. U.S. Environmental Protection Agency
B. Illinois Department of Natural Resources
C. Illinois Department of Public Health
D. Illinois Department of Agriculture
Answer: D
Rationale: The Illinois Department of Agriculture administers the Illinois
Pesticide Act and oversees commercial applicator licensing, including the Public
Health Pest Control category. The Chicago Department of Public Health may
,conduct vector surveillance and control programs, but the regulatory authority
for pesticide applicator certification lies with the state department of agriculture.
3. Under the Illinois Structural Pest Control Act, a commercial applicator
performing public health pest control in a sensitive environment such as a
school must notify which group at least 24 hours before an application?
A. The local fire department
B. The Illinois Environmental Protection Agency
C. Parents, guardians, and staff
D. The county health department vector control division
Answer: C
Rationale: The Illinois Structural Pest Control Act and associated administrative
rules require that when pesticides are applied in schools, parents, guardians, and
staff be notified at least 24 hours in advance, unless an emergency application is
necessary. This notification allows individuals with chemical sensitivities to take
precautions.
4. A homeowner in Chicago finds a bat inside a bedroom where people were
sleeping. The most important public health step after safely capturing the bat
is to
A. submit the bat for rabies testing
B. release the bat outdoors immediately
C. fog the room with a general-purpose insecticide
D. vaccinate all household members against histoplasmosis
Answer: A
Rationale: Because bats are the primary rabies vector in Illinois, any bat found
in a room with a sleeping person, an unattended child, or an individual with a
cognitive disability must be tested for rabies. Releasing the bat eliminates the
opportunity to rule out rabies exposure, which can require costly post-exposure
prophylaxis. Histoplasmosis is a fungal disease associated with bird and bat
droppings, not rabies.
5. The primary vector of West Nile virus in Chicago is the
A. Asian tiger mosquito (Aedes albopictus)
B. yellow fever mosquito (Aedes aegypti)
, C. northern house mosquito (Culex pipiens)
D. inland floodwater mosquito (Aedes vexans)
Answer: C
Rationale: Culex pipiens, the northern house mosquito, is the principal enzootic
and bridge vector of West Nile virus in the Chicago region. It breeds in stagnant,
organically rich water in catch basins, containers, and stormwater
infrastructure. While Aedes albopictus is present and can transmit the virus,
Culex pipiens is responsible for the vast majority of human infections in the
area.
6. Which life stage of the mosquito is the target of larvicides such as Bacillus
thuringiensis israelensis (Bti)?
A. Egg
B. Larva
C. Pupa
D. Adult
Answer: B
Rationale: Bti is a bacterial larvicide that produces a crystal protein toxic
specifically to mosquito larvae after ingestion. It is ineffective against eggs,
pupae, or adults. Larviciding is a cornerstone of integrated mosquito
management because it kills mosquitoes before they can emerge as biting adults.
7. When using an ultra-low volume (ULV) cold fogger for adult mosquito
control in a Chicago residential area, the optimum droplet size for impinging
on flying mosquitoes is in the range of
A. 1–5 microns
B. 5–25 microns
C. 50–100 microns
D. 200–400 microns
Answer: B
Rationale: ULV adulticides are designed to produce aerosol droplets in the 5–25
micron volume median diameter range, which provides the best balance between
airborne suspension time and impaction on flying mosquitoes. Droplets that are
too small (<5 microns) may be respirable and pose an inhalation hazard, while
, droplets larger than 50 microns settle too quickly and are ineffective for space
spraying.
8. A rodenticide containing the active ingredient bromadiolone belongs to
which toxicological class?
A. First-generation anticoagulant
B. Second-generation anticoagulant
C. Acute neurotoxin
D. Calciferol analog
Answer: B
Rationale: Bromadiolone is a second-generation anticoagulant rodenticide.
Unlike first-generation compounds such as warfarin, second-generation
anticoagulants are effective with a single feeding, have longer biological half-
lives, and are more toxic to non-target wildlife through secondary poisoning.
This distinction is critical for bait placement and risk mitigation in public health
rodent control.
9. According to the Chicago Municipal Code, property owners are responsible
for rodent control when evidence of active rat infestation is present. Which
of the following is the most important non-chemical method for long-term
rat suppression?
A. Broadcasting rodenticide pellets over entire yard
B. Trapping with glue boards in all garden beds
C. Eliminating outdoor food sources and harborage
D. Applying a repellent spray around the foundation weekly
Answer: C
Rationale: Sanitation and environmental management are the pillars of urban
rodent IPM. Removing pet food, fallen fruit, garbage, and clutter, as well as
sealing structural entry points, reduces carrying capacity and limits populations
far more sustainably than repeated chemical use alone. Chicago’s ordinance
emphasizes property maintenance to deprive rats of food, water, and shelter.
10.Which signal word on a pesticide label indicates the highest level of acute
toxicity to humans?
A. DANGER–POISON
Public Health Pest Control Practice
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A public health pest is best defined as an organism that
A. damages ornamental plants in public parks
B. transmits disease or otherwise threatens human health
C. competes with humans for food in agricultural settings
D. causes structural damage to public buildings
Answer: B
Rationale: Public health pests are those that can directly or indirectly cause
human disease, injury, or discomfort. While structural or agricultural pests can
have economic impacts, the public health definition centers on disease
transmission, allergenic properties, biting, stinging, or contamination that
endangers human health.
2. In Chicago, which agency has primary authority to regulate commercial
pesticide application for public health pest control?
A. U.S. Environmental Protection Agency
B. Illinois Department of Natural Resources
C. Illinois Department of Public Health
D. Illinois Department of Agriculture
Answer: D
Rationale: The Illinois Department of Agriculture administers the Illinois
Pesticide Act and oversees commercial applicator licensing, including the Public
Health Pest Control category. The Chicago Department of Public Health may
,conduct vector surveillance and control programs, but the regulatory authority
for pesticide applicator certification lies with the state department of agriculture.
3. Under the Illinois Structural Pest Control Act, a commercial applicator
performing public health pest control in a sensitive environment such as a
school must notify which group at least 24 hours before an application?
A. The local fire department
B. The Illinois Environmental Protection Agency
C. Parents, guardians, and staff
D. The county health department vector control division
Answer: C
Rationale: The Illinois Structural Pest Control Act and associated administrative
rules require that when pesticides are applied in schools, parents, guardians, and
staff be notified at least 24 hours in advance, unless an emergency application is
necessary. This notification allows individuals with chemical sensitivities to take
precautions.
4. A homeowner in Chicago finds a bat inside a bedroom where people were
sleeping. The most important public health step after safely capturing the bat
is to
A. submit the bat for rabies testing
B. release the bat outdoors immediately
C. fog the room with a general-purpose insecticide
D. vaccinate all household members against histoplasmosis
Answer: A
Rationale: Because bats are the primary rabies vector in Illinois, any bat found
in a room with a sleeping person, an unattended child, or an individual with a
cognitive disability must be tested for rabies. Releasing the bat eliminates the
opportunity to rule out rabies exposure, which can require costly post-exposure
prophylaxis. Histoplasmosis is a fungal disease associated with bird and bat
droppings, not rabies.
5. The primary vector of West Nile virus in Chicago is the
A. Asian tiger mosquito (Aedes albopictus)
B. yellow fever mosquito (Aedes aegypti)
, C. northern house mosquito (Culex pipiens)
D. inland floodwater mosquito (Aedes vexans)
Answer: C
Rationale: Culex pipiens, the northern house mosquito, is the principal enzootic
and bridge vector of West Nile virus in the Chicago region. It breeds in stagnant,
organically rich water in catch basins, containers, and stormwater
infrastructure. While Aedes albopictus is present and can transmit the virus,
Culex pipiens is responsible for the vast majority of human infections in the
area.
6. Which life stage of the mosquito is the target of larvicides such as Bacillus
thuringiensis israelensis (Bti)?
A. Egg
B. Larva
C. Pupa
D. Adult
Answer: B
Rationale: Bti is a bacterial larvicide that produces a crystal protein toxic
specifically to mosquito larvae after ingestion. It is ineffective against eggs,
pupae, or adults. Larviciding is a cornerstone of integrated mosquito
management because it kills mosquitoes before they can emerge as biting adults.
7. When using an ultra-low volume (ULV) cold fogger for adult mosquito
control in a Chicago residential area, the optimum droplet size for impinging
on flying mosquitoes is in the range of
A. 1–5 microns
B. 5–25 microns
C. 50–100 microns
D. 200–400 microns
Answer: B
Rationale: ULV adulticides are designed to produce aerosol droplets in the 5–25
micron volume median diameter range, which provides the best balance between
airborne suspension time and impaction on flying mosquitoes. Droplets that are
too small (<5 microns) may be respirable and pose an inhalation hazard, while
, droplets larger than 50 microns settle too quickly and are ineffective for space
spraying.
8. A rodenticide containing the active ingredient bromadiolone belongs to
which toxicological class?
A. First-generation anticoagulant
B. Second-generation anticoagulant
C. Acute neurotoxin
D. Calciferol analog
Answer: B
Rationale: Bromadiolone is a second-generation anticoagulant rodenticide.
Unlike first-generation compounds such as warfarin, second-generation
anticoagulants are effective with a single feeding, have longer biological half-
lives, and are more toxic to non-target wildlife through secondary poisoning.
This distinction is critical for bait placement and risk mitigation in public health
rodent control.
9. According to the Chicago Municipal Code, property owners are responsible
for rodent control when evidence of active rat infestation is present. Which
of the following is the most important non-chemical method for long-term
rat suppression?
A. Broadcasting rodenticide pellets over entire yard
B. Trapping with glue boards in all garden beds
C. Eliminating outdoor food sources and harborage
D. Applying a repellent spray around the foundation weekly
Answer: C
Rationale: Sanitation and environmental management are the pillars of urban
rodent IPM. Removing pet food, fallen fruit, garbage, and clutter, as well as
sealing structural entry points, reduces carrying capacity and limits populations
far more sustainably than repeated chemical use alone. Chicago’s ordinance
emphasizes property maintenance to deprive rats of food, water, and shelter.
10.Which signal word on a pesticide label indicates the highest level of acute
toxicity to humans?
A. DANGER–POISON
