Oklahoma Commercial Pesticide
Applicator – Category 7 Public Health
Pest Control Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which mosquito species is the primary vector of West Nile virus in urban
environments?
A. Culex pipiens
B. Anopheles gambiae
C. Aedes aegypti
D. Mansonia uniformis
Answer: A
Rationale: Culex pipiens is widely recognized as the main urban vector of West
Nile virus due to its preference for bird and human feeding, as well as its ability
to breed in stagnant, nutrient-rich water commonly found in urban
environments. This species plays a critical role in bridging transmission between
avian reservoirs and humans.
Question 2
The most effective method for controlling rodent populations in public health
programs is:
,A. Habitat modification and sanitation
B. Weekly chemical spraying
C. Fogging with pyrethroids
D. Increasing predator populations only
Answer: B
Rationale: While sanitation is foundational, rodent control in public health
programs relies heavily on strategic chemical control combined with baiting and
exclusion. Habitat modification alone is insufficient in high-density infestations,
making integrated chemical application essential.
Question 3
Which insecticide class acts primarily by disrupting sodium channel function in
insects?
A. Carbamates
B. Pyrethroids
C. Organophosphates
D. Neonicotinoids
Answer: C
Rationale: Organophosphates inhibit acetylcholinesterase, but pyrethroids
specifically disrupt voltage-gated sodium channels, causing prolonged nerve
excitation leading to paralysis and death. This mode of action is highly effective
for rapid knockdown in public health pests.
Question 4
The main disease transmitted by Anopheles mosquitoes is:
A. Dengue fever
B. Malaria
C. Yellow fever
D. Zika virus
,Answer: D
Rationale: Aedes aegypti is the primary vector for Zika virus, dengue, and yellow
fever, especially in tropical urban environments where artificial water containers
provide breeding habitats.
Question 5
Integrated Pest Management (IPM) emphasizes:
A. Chemical control only
B. Eradication of all insects
C. Combination of biological, cultural, and chemical methods
D. Weekly pesticide application schedules
Answer: A
Rationale: IPM integrates multiple control strategies including biological,
cultural, mechanical, and chemical approaches, focusing on long-term
suppression and environmental safety rather than sole reliance on pesticides.
Question 6
Which organism is commonly associated with plague transmission?
A. Xenopsylla cheopis
B. Pediculus humanus
C. Culex quinquefasciatus
D. Musca domestica
Answer: B
Rationale: Human lice (Pediculus humanus) are associated with epidemic typhus
transmission, not plague. Plague is transmitted primarily by Xenopsylla cheopis,
the oriental rat flea.
Question 7
, A key sign of bed bug infestation is:
A. Webbing on walls
B. Sawdust piles
C. Blood spots on bedding
D. Chewed wood furniture
Answer: C
Rationale: Bed bugs leave small blood spots, fecal staining, and shed
exoskeletons on bedding and nearby surfaces due to their nocturnal feeding
habits on human hosts.
Question 8
The primary purpose of ULV (Ultra-Low Volume) application is to:
A. Increase pesticide persistence
B. Reduce water usage and create fine droplets
C. Kill rodent populations
D. Sterilize breeding sites permanently
Answer: D
Rationale: ULV applications are designed to deliver concentrated pesticide in
very small droplet sizes for rapid knockdown of flying insects, not permanent
sterilization of habitats.
Question 9
Which rodent is most commonly associated with plague outbreaks?
A. Norway rat
B. House mouse
C. Roof rat
D. Field mouse
Applicator – Category 7 Public Health
Pest Control Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
Which mosquito species is the primary vector of West Nile virus in urban
environments?
A. Culex pipiens
B. Anopheles gambiae
C. Aedes aegypti
D. Mansonia uniformis
Answer: A
Rationale: Culex pipiens is widely recognized as the main urban vector of West
Nile virus due to its preference for bird and human feeding, as well as its ability
to breed in stagnant, nutrient-rich water commonly found in urban
environments. This species plays a critical role in bridging transmission between
avian reservoirs and humans.
Question 2
The most effective method for controlling rodent populations in public health
programs is:
,A. Habitat modification and sanitation
B. Weekly chemical spraying
C. Fogging with pyrethroids
D. Increasing predator populations only
Answer: B
Rationale: While sanitation is foundational, rodent control in public health
programs relies heavily on strategic chemical control combined with baiting and
exclusion. Habitat modification alone is insufficient in high-density infestations,
making integrated chemical application essential.
Question 3
Which insecticide class acts primarily by disrupting sodium channel function in
insects?
A. Carbamates
B. Pyrethroids
C. Organophosphates
D. Neonicotinoids
Answer: C
Rationale: Organophosphates inhibit acetylcholinesterase, but pyrethroids
specifically disrupt voltage-gated sodium channels, causing prolonged nerve
excitation leading to paralysis and death. This mode of action is highly effective
for rapid knockdown in public health pests.
Question 4
The main disease transmitted by Anopheles mosquitoes is:
A. Dengue fever
B. Malaria
C. Yellow fever
D. Zika virus
,Answer: D
Rationale: Aedes aegypti is the primary vector for Zika virus, dengue, and yellow
fever, especially in tropical urban environments where artificial water containers
provide breeding habitats.
Question 5
Integrated Pest Management (IPM) emphasizes:
A. Chemical control only
B. Eradication of all insects
C. Combination of biological, cultural, and chemical methods
D. Weekly pesticide application schedules
Answer: A
Rationale: IPM integrates multiple control strategies including biological,
cultural, mechanical, and chemical approaches, focusing on long-term
suppression and environmental safety rather than sole reliance on pesticides.
Question 6
Which organism is commonly associated with plague transmission?
A. Xenopsylla cheopis
B. Pediculus humanus
C. Culex quinquefasciatus
D. Musca domestica
Answer: B
Rationale: Human lice (Pediculus humanus) are associated with epidemic typhus
transmission, not plague. Plague is transmitted primarily by Xenopsylla cheopis,
the oriental rat flea.
Question 7
, A key sign of bed bug infestation is:
A. Webbing on walls
B. Sawdust piles
C. Blood spots on bedding
D. Chewed wood furniture
Answer: C
Rationale: Bed bugs leave small blood spots, fecal staining, and shed
exoskeletons on bedding and nearby surfaces due to their nocturnal feeding
habits on human hosts.
Question 8
The primary purpose of ULV (Ultra-Low Volume) application is to:
A. Increase pesticide persistence
B. Reduce water usage and create fine droplets
C. Kill rodent populations
D. Sterilize breeding sites permanently
Answer: D
Rationale: ULV applications are designed to deliver concentrated pesticide in
very small droplet sizes for rapid knockdown of flying insects, not permanent
sterilization of habitats.
Question 9
Which rodent is most commonly associated with plague outbreaks?
A. Norway rat
B. House mouse
C. Roof rat
D. Field mouse
