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OKLAHOMA COMMERCIAL PESTICIDE APPLICATOR
CERTIFICATION — CATEGORY 4: SEED TREATMENT
EXAMINATION 2026/2027 COMPLETE (150) CURRENT
TESTING QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES.
PESTICIDE
Prepare effectively for the Oklahoma Commercial Pesticide Applicator Certification
Category 4 Seed Treatment Examination with this focused study resource. It supports
review of seed treatment principles, pesticide safety, application methods, treated
seed handling, equipment, and applicable regulatory requirements. Use the material
to reinforce your knowledge, review key topics, and identify areas that may require
additional study. This resource is suited for commercial pesticide applicators,
agricultural professionals, and candidates preparing for the Oklahoma Category 4
Seed Treatment certification examination.
MULTIPLE CHOICE.
SECTION 1: SEED TREATMENT PRINCIPLES & DEFINITIONS (Questions 1–
20)
1. Which of the following is the PRIMARY purpose of seed treatment as
defined by Oklahoma Category 4 certification?
• A. To increase seed size for easier planting
• B. To apply pesticides that protect seeds from pests and diseases
• C. To add micronutrients for better nutrition
• D. To improve seed color for marketability
Answer: B. To apply pesticides that protect seeds from pests and diseases
Rationale: Seed treatment is the application of pesticides to seeds to
protect against pathogens, insects, and soil-borne pests; it is not
intended for nutrition or aesthetic purposes.
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2. According to Oklahoma Category 4 regulations, which of the following
is NOT considered a seed treatment?
• A. Fungicide coating on corn seed
• B. Rhizobium inoculant applied to soybean seed
• C. Insecticide coating on wheat seed
• D. Nematicide applied to alfalfa seed
Answer: B. Rhizobium inoculant applied to soybean seed
Rationale: Rhizobium inoculants are biological nitrogen-fixing agents, not
pesticide products, so they are excluded from the seed-treatment
definition.
3. How does seed treatment differ from grain (stored-commodity)
treatment?
• A. Seed treatment is applied after harvest; grain treatment before
planting
• B. Seed treatment protects the seed during germination; grain
treatment protects stored grain from spoilage
• C. Seed treatment uses only systemic chemicals; grain treatment uses
only contact chemicals
• D. There is no regulatory difference between the two
Answer: B. Seed treatment protects the seed during germination; grain
treatment protects stored grain from spoilage
Rationale: Seed treatment is for planting material to protect emerging
seedlings, while grain treatment targets stored commodities to prevent
spoilage and pest damage.
4. What does "seed flowability" refer to in treated seed?
• A. The rate of seed respiration
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• B. The ease with which treated seed moves through planting
equipment
• C. The speed of germination in cold soil
• D. The degradation rate of the treatment
Answer: B. The ease with which treated seed moves through planting
equipment
Rationale: High-quality seed treatment should maintain or improve
flowability so seed moves smoothly through planters without clumping.
5. A "surface-borne" pathogen primarily resides where on the seed?
• A. Inside the embryo
• B. On the seed coat
• C. In the endosperm
• D. In the seed's storage protein
Answer: B. On the seed coat
Rationale: Surface-borne pathogens live on the outer seed coat and can
be controlled by contact fungicides applied as seed treatments.
6. Loose smut of wheat is an example of which type of pathogen?
• A. Surface-borne pathogen
• B. Seedborne pathogen (internal)
• C. Soilborne pathogen
• D. Airborne pathogen
Answer: B. Seedborne pathogen (internal)
Rationale: Loose smut is a seedborne disease where the fungus resides
inside the seed embryo. It requires systemic fungicides that penetrate the
seed rather than surface protectants.
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7. Which of the following best defines a seed treatment?
• A. Any substance added to seed to improve germination
• B. The application of pesticides to seed for the purpose of protecting
the seed and seedling from pests
• C. The process of cleaning and grading seed before planting
• D. The addition of fertilizers to seed before planting
Answer: B. The application of pesticides to seed for the purpose of
protecting the seed and seedling from pests
Rationale: Seed treatment involves the application of pesticides to seed
to protect against insects, fungi, and other pathogens during early growth
stages.
8. A "systemic" seed treatment pesticide:
• A. Remains on the seed surface only
• B. Is absorbed by the seed and translocated to the developing
seedling
• C. Only affects soilborne pests
• D. Is applied as a dust formulation
Answer: B. Is absorbed by the seed and translocated to the developing
seedling
Rationale: Systemic seed treatments are absorbed by the seed and move
through the developing plant, providing protection against pests that feed
on the seedling after emergence.
9. A "contact" seed treatment pesticide:
• A. Remains on the seed surface to protect against surface-borne
pathogens
OKLAHOMA COMMERCIAL PESTICIDE APPLICATOR
CERTIFICATION — CATEGORY 4: SEED TREATMENT
EXAMINATION 2026/2027 COMPLETE (150) CURRENT
TESTING QUESTIONS AND CORRECT ANSWERS WITH
DETAILED RATIONALES.
PESTICIDE
Prepare effectively for the Oklahoma Commercial Pesticide Applicator Certification
Category 4 Seed Treatment Examination with this focused study resource. It supports
review of seed treatment principles, pesticide safety, application methods, treated
seed handling, equipment, and applicable regulatory requirements. Use the material
to reinforce your knowledge, review key topics, and identify areas that may require
additional study. This resource is suited for commercial pesticide applicators,
agricultural professionals, and candidates preparing for the Oklahoma Category 4
Seed Treatment certification examination.
MULTIPLE CHOICE.
SECTION 1: SEED TREATMENT PRINCIPLES & DEFINITIONS (Questions 1–
20)
1. Which of the following is the PRIMARY purpose of seed treatment as
defined by Oklahoma Category 4 certification?
• A. To increase seed size for easier planting
• B. To apply pesticides that protect seeds from pests and diseases
• C. To add micronutrients for better nutrition
• D. To improve seed color for marketability
Answer: B. To apply pesticides that protect seeds from pests and diseases
Rationale: Seed treatment is the application of pesticides to seeds to
protect against pathogens, insects, and soil-borne pests; it is not
intended for nutrition or aesthetic purposes.
, Page 2 of 58
2. According to Oklahoma Category 4 regulations, which of the following
is NOT considered a seed treatment?
• A. Fungicide coating on corn seed
• B. Rhizobium inoculant applied to soybean seed
• C. Insecticide coating on wheat seed
• D. Nematicide applied to alfalfa seed
Answer: B. Rhizobium inoculant applied to soybean seed
Rationale: Rhizobium inoculants are biological nitrogen-fixing agents, not
pesticide products, so they are excluded from the seed-treatment
definition.
3. How does seed treatment differ from grain (stored-commodity)
treatment?
• A. Seed treatment is applied after harvest; grain treatment before
planting
• B. Seed treatment protects the seed during germination; grain
treatment protects stored grain from spoilage
• C. Seed treatment uses only systemic chemicals; grain treatment uses
only contact chemicals
• D. There is no regulatory difference between the two
Answer: B. Seed treatment protects the seed during germination; grain
treatment protects stored grain from spoilage
Rationale: Seed treatment is for planting material to protect emerging
seedlings, while grain treatment targets stored commodities to prevent
spoilage and pest damage.
4. What does "seed flowability" refer to in treated seed?
• A. The rate of seed respiration
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• B. The ease with which treated seed moves through planting
equipment
• C. The speed of germination in cold soil
• D. The degradation rate of the treatment
Answer: B. The ease with which treated seed moves through planting
equipment
Rationale: High-quality seed treatment should maintain or improve
flowability so seed moves smoothly through planters without clumping.
5. A "surface-borne" pathogen primarily resides where on the seed?
• A. Inside the embryo
• B. On the seed coat
• C. In the endosperm
• D. In the seed's storage protein
Answer: B. On the seed coat
Rationale: Surface-borne pathogens live on the outer seed coat and can
be controlled by contact fungicides applied as seed treatments.
6. Loose smut of wheat is an example of which type of pathogen?
• A. Surface-borne pathogen
• B. Seedborne pathogen (internal)
• C. Soilborne pathogen
• D. Airborne pathogen
Answer: B. Seedborne pathogen (internal)
Rationale: Loose smut is a seedborne disease where the fungus resides
inside the seed embryo. It requires systemic fungicides that penetrate the
seed rather than surface protectants.
, Page 4 of 58
7. Which of the following best defines a seed treatment?
• A. Any substance added to seed to improve germination
• B. The application of pesticides to seed for the purpose of protecting
the seed and seedling from pests
• C. The process of cleaning and grading seed before planting
• D. The addition of fertilizers to seed before planting
Answer: B. The application of pesticides to seed for the purpose of
protecting the seed and seedling from pests
Rationale: Seed treatment involves the application of pesticides to seed
to protect against insects, fungi, and other pathogens during early growth
stages.
8. A "systemic" seed treatment pesticide:
• A. Remains on the seed surface only
• B. Is absorbed by the seed and translocated to the developing
seedling
• C. Only affects soilborne pests
• D. Is applied as a dust formulation
Answer: B. Is absorbed by the seed and translocated to the developing
seedling
Rationale: Systemic seed treatments are absorbed by the seed and move
through the developing plant, providing protection against pests that feed
on the seedling after emergence.
9. A "contact" seed treatment pesticide:
• A. Remains on the seed surface to protect against surface-borne
pathogens
