Colorado QS/CO Pesticide Certification Exam
Qualified Supervisor (QS) & Certified Operator (CO)
Practice Assessment 2026/2027 Update | Colorado
Department of Agriculture.
Question 1 (Multiple-Choice)
Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), which federal agency is
designated as the primary enforcement body for pesticide registration and regulation?
A. U.S. Department of Agriculture (USDA)
B. Environmental Protection Agency (EPA)
C. Occupational Safety and Health Administration (OSHA)
D. Food and Drug Administration (FDA)
Answer: B [CORRECT]
Rationale: FIFRA establishes the EPA as the primary federal enforcement body for pesticide
registration, labeling, and use regulation throughout the United States. The EPA evaluates
pesticides for human health and environmental safety before granting registration. State
agencies like the Colorado Department of Agriculture (CDA) enforce state-level compliance
but cannot adopt standards weaker than federal requirements under FIFRA.
Question 2 (True/False)
Under FIFRA, it is a violation to use a registered pesticide in a manner inconsistent with its
labeling directions.
A. True
B. False
Answer: A [CORRECT]
Rationale: FIFRA Section 12(a)(2)(G) makes it unlawful to use any registered pesticide in a
manner inconsistent with its labeling. The pesticide label is a legally binding document, and
deviation from labeled directions—including application rates, target pests, PPE
requirements, and REIs—constitutes a federal violation subject to civil and criminal penalties.
This principle is commonly summarized as "the label is the law."
Sub-Topic: Pesticide Registration Types – Section 3, 18, 24c, 25b (2 Questions)
,Question 3 (Multiple-Choice)
A Colorado wheat farmer is facing a sudden outbreak of Russian wheat aphid for which no
Section 3 registered pesticide is labeled for use on wheat in Colorado. The Colorado
Department of Agriculture requests emergency use authorization from the EPA. This type of
registration is issued under:
A. FIFRA Section 3
B. FIFRA Section 18
C. FIFRA Section 24(c)
D. FIFRA Section 25(b)
Answer: B [CORRECT]
Rationale: FIFRA Section 18 authorizes Emergency Exemptions that allow states or federal
agencies to permit the unregistered use of a pesticide for a limited time when emergency pest
conditions exist. Section 18 exemptions cannot be advertised and are time-limited and
geographically specific. Section 3 (A) is standard full registration; Section 24(c) (C) is for
Special Local Needs (SLN) registrations that address ongoing—not emergency—pest
situations; Section 25(b) (D) exempts minimum-risk pesticides from registration.
Question 4 (True/False)
A pesticide registered under FIFRA Section 24(c) Special Local Needs (SLN) is valid for use in all
50 states, provided the pest problem exists in each state.
A. True
B. False
Answer: B [CORRECT]
Rationale: Section 24(c) Special Local Need registrations are state-specific and valid ONLY in
the state that issued the registration. If a Colorado SLN is granted for a specific use, that
product may not be used under that SLN label in Wyoming, Nebraska, or any other state. EPA
has authority to disapprove a state's SLN application. This state-specific limitation is a critical
distinction between Section 24(c) and Section 3 federal registrations, which are valid
nationwide.
Sub-Topic: General Use vs. Restricted Use Pesticides (2 Questions)
Question 5 (Multiple-Choice)
, Which of the following individuals is legally permitted to apply a Restricted Use Pesticide
(RUP) in Colorado without direct on-site supervision?
A. A 17-year-old farm employee with 2 years of experience
B. A licensed Certified Operator (CO) working under the supervision of a Qualified Supervisor
C. An unlicensed technician applying RUPs on a commercial farm
D. A homeowner purchasing an RUP from a licensed dealer
Answer: B [CORRECT]
Rationale: Under Colorado Title 35, Article 10, and CDA Rules, any person who uses or
supervises the use of a Restricted Use Pesticide must be licensed as a Qualified Supervisor,
Certified Operator, or Private Applicator. A Certified Operator may apply RUPs under the
supervision of a Qualified Supervisor (which does not require the QS to be physically present).
Unlicensed technicians (C) may only handle RUPs under the on-site supervision of a QS. All
applicators must be at least 18 years old (A is incorrect). Homeowners (D) cannot purchase or
use RUPs without proper licensure.
Question 6 (Select-All-That-Apply)
Which of the following factors may cause the EPA to classify a pesticide as Restricted Use?
(Select all that apply.)
A. High acute toxicity to humans
B. Potential for groundwater contamination
C. Risk to endangered species
D. High cost of the product
E. Potential to cause unreasonable adverse effects even when used as directed
Answer: A, B, C, E [CORRECT]
Rationale: The EPA classifies pesticides as Restricted Use when they pose elevated risks that
require additional training and oversight for safe application. Factors include high acute
toxicity (A), environmental hazards such as groundwater contamination potential (B), risk to
endangered species (C), and the potential to cause unreasonable adverse effects even when
used according to label directions (E). Product cost (D) is never a factor in RUP classification.
RUP classification ensures that only trained, licensed applicators handle these higher-risk
products.
Qualified Supervisor (QS) & Certified Operator (CO)
Practice Assessment 2026/2027 Update | Colorado
Department of Agriculture.
Question 1 (Multiple-Choice)
Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), which federal agency is
designated as the primary enforcement body for pesticide registration and regulation?
A. U.S. Department of Agriculture (USDA)
B. Environmental Protection Agency (EPA)
C. Occupational Safety and Health Administration (OSHA)
D. Food and Drug Administration (FDA)
Answer: B [CORRECT]
Rationale: FIFRA establishes the EPA as the primary federal enforcement body for pesticide
registration, labeling, and use regulation throughout the United States. The EPA evaluates
pesticides for human health and environmental safety before granting registration. State
agencies like the Colorado Department of Agriculture (CDA) enforce state-level compliance
but cannot adopt standards weaker than federal requirements under FIFRA.
Question 2 (True/False)
Under FIFRA, it is a violation to use a registered pesticide in a manner inconsistent with its
labeling directions.
A. True
B. False
Answer: A [CORRECT]
Rationale: FIFRA Section 12(a)(2)(G) makes it unlawful to use any registered pesticide in a
manner inconsistent with its labeling. The pesticide label is a legally binding document, and
deviation from labeled directions—including application rates, target pests, PPE
requirements, and REIs—constitutes a federal violation subject to civil and criminal penalties.
This principle is commonly summarized as "the label is the law."
Sub-Topic: Pesticide Registration Types – Section 3, 18, 24c, 25b (2 Questions)
,Question 3 (Multiple-Choice)
A Colorado wheat farmer is facing a sudden outbreak of Russian wheat aphid for which no
Section 3 registered pesticide is labeled for use on wheat in Colorado. The Colorado
Department of Agriculture requests emergency use authorization from the EPA. This type of
registration is issued under:
A. FIFRA Section 3
B. FIFRA Section 18
C. FIFRA Section 24(c)
D. FIFRA Section 25(b)
Answer: B [CORRECT]
Rationale: FIFRA Section 18 authorizes Emergency Exemptions that allow states or federal
agencies to permit the unregistered use of a pesticide for a limited time when emergency pest
conditions exist. Section 18 exemptions cannot be advertised and are time-limited and
geographically specific. Section 3 (A) is standard full registration; Section 24(c) (C) is for
Special Local Needs (SLN) registrations that address ongoing—not emergency—pest
situations; Section 25(b) (D) exempts minimum-risk pesticides from registration.
Question 4 (True/False)
A pesticide registered under FIFRA Section 24(c) Special Local Needs (SLN) is valid for use in all
50 states, provided the pest problem exists in each state.
A. True
B. False
Answer: B [CORRECT]
Rationale: Section 24(c) Special Local Need registrations are state-specific and valid ONLY in
the state that issued the registration. If a Colorado SLN is granted for a specific use, that
product may not be used under that SLN label in Wyoming, Nebraska, or any other state. EPA
has authority to disapprove a state's SLN application. This state-specific limitation is a critical
distinction between Section 24(c) and Section 3 federal registrations, which are valid
nationwide.
Sub-Topic: General Use vs. Restricted Use Pesticides (2 Questions)
Question 5 (Multiple-Choice)
, Which of the following individuals is legally permitted to apply a Restricted Use Pesticide
(RUP) in Colorado without direct on-site supervision?
A. A 17-year-old farm employee with 2 years of experience
B. A licensed Certified Operator (CO) working under the supervision of a Qualified Supervisor
C. An unlicensed technician applying RUPs on a commercial farm
D. A homeowner purchasing an RUP from a licensed dealer
Answer: B [CORRECT]
Rationale: Under Colorado Title 35, Article 10, and CDA Rules, any person who uses or
supervises the use of a Restricted Use Pesticide must be licensed as a Qualified Supervisor,
Certified Operator, or Private Applicator. A Certified Operator may apply RUPs under the
supervision of a Qualified Supervisor (which does not require the QS to be physically present).
Unlicensed technicians (C) may only handle RUPs under the on-site supervision of a QS. All
applicators must be at least 18 years old (A is incorrect). Homeowners (D) cannot purchase or
use RUPs without proper licensure.
Question 6 (Select-All-That-Apply)
Which of the following factors may cause the EPA to classify a pesticide as Restricted Use?
(Select all that apply.)
A. High acute toxicity to humans
B. Potential for groundwater contamination
C. Risk to endangered species
D. High cost of the product
E. Potential to cause unreasonable adverse effects even when used as directed
Answer: A, B, C, E [CORRECT]
Rationale: The EPA classifies pesticides as Restricted Use when they pose elevated risks that
require additional training and oversight for safe application. Factors include high acute
toxicity (A), environmental hazards such as groundwater contamination potential (B), risk to
endangered species (C), and the potential to cause unreasonable adverse effects even when
used according to label directions (E). Product cost (D) is never a factor in RUP classification.
RUP classification ensures that only trained, licensed applicators handle these higher-risk
products.
