Ohio Pesticide Applicator Certification Recommended Exam 2026
| Category 6a – Ornamental Weed Control | Multiple-Choice
Questions with Correct Answers and Detailed Rationales |
Complete PDF Exam Preparation Guide
1. Which of the following is a common broadleaf weed in ornamental beds?
A. Dandelion
B. Crabgrass
C. Goosegrass
D. Annual bluegrass
Answer: A. Dandelion
Rationale: Dandelions are broadleaf weeds commonly found in ornamental beds,
while crabgrass and goosegrass are grasses.
2. Which type of herbicide controls weeds before they emerge?
A. Pre-emergent
B. Post-emergent
C. Contact
D. Systemic
Answer: A. Pre-emergent
Rationale: Pre-emergent herbicides prevent weed seeds from germinating and
are applied before weed growth.
3. Which herbicide mode of action moves throughout the plant to control deep-
rooted weeds?
A. Systemic
B. Contact
C. Residual
D. Selective
Answer: A. Systemic
Rationale: Systemic herbicides are absorbed and translocated through the plant,
allowing control of root systems.
,4. Which herbicide type only affects weeds upon contact and does not move
within the plant?
A. Contact
B. Systemic
C. Pre-emergent
D. Selective
Answer: A. Contact
Rationale: Contact herbicides kill the tissue they touch but do not translocate to
other parts of the plant.
5. What is the primary safety equipment required when applying herbicides?
A. Personal Protective Equipment (PPE)
B. Sunglasses only
C. Safety shoes only
D. Hard hat only
Answer: A. Personal Protective Equipment (PPE)
Rationale: PPE protects applicators from chemical exposure, including gloves, eye
protection, and appropriate clothing.
6. Which factor is most important to prevent herbicide drift?
A. Wind speed and direction
B. Soil type
C. Shade cover
D. Temperature only
Answer: A. Wind speed and direction
Rationale: Drift can damage non-target plants; applying at low wind speeds
minimizes risk.
7. Which of the following is a selective herbicide?
A. 2,4-D
B. Glyphosate
C. Non-selective mixture
D. Paraquat
Answer: A. 2,4-D
, Rationale: 2,4-D selectively controls broadleaf weeds without harming most
grasses.
8. Which herbicide is non-selective and can damage or kill all vegetation it
contacts?
A. Glyphosate
B. 2,4-D
C. Atrazine
D. MCPP
Answer: A. Glyphosate
Rationale: Glyphosate is a non-selective systemic herbicide that kills most plants
upon contact.
9. Why is it important to read and follow the herbicide label?
A. It provides legal, safety, and application instructions
B. Only for storage purposes
C. Optional information
D. Marketing purposes
Answer: A. It provides legal, safety, and application instructions
Rationale: Labels are legally binding and provide essential safety and efficacy
instructions.
10. Which weed is considered an invasive groundcover in ornamental
landscapes?
A. Creeping Charlie (Glechoma hederacea)
B. Kentucky bluegrass
C. Bermuda grass
D. Fescue
Answer: A. Creeping Charlie (Glechoma hederacea)
Rationale: Creeping Charlie spreads aggressively and can crowd out ornamentals.
11. What is the ideal condition for applying most foliar herbicides?
A. Dry leaves, low wind, moderate temperature
B. Rainy conditions
C. Strong winds
| Category 6a – Ornamental Weed Control | Multiple-Choice
Questions with Correct Answers and Detailed Rationales |
Complete PDF Exam Preparation Guide
1. Which of the following is a common broadleaf weed in ornamental beds?
A. Dandelion
B. Crabgrass
C. Goosegrass
D. Annual bluegrass
Answer: A. Dandelion
Rationale: Dandelions are broadleaf weeds commonly found in ornamental beds,
while crabgrass and goosegrass are grasses.
2. Which type of herbicide controls weeds before they emerge?
A. Pre-emergent
B. Post-emergent
C. Contact
D. Systemic
Answer: A. Pre-emergent
Rationale: Pre-emergent herbicides prevent weed seeds from germinating and
are applied before weed growth.
3. Which herbicide mode of action moves throughout the plant to control deep-
rooted weeds?
A. Systemic
B. Contact
C. Residual
D. Selective
Answer: A. Systemic
Rationale: Systemic herbicides are absorbed and translocated through the plant,
allowing control of root systems.
,4. Which herbicide type only affects weeds upon contact and does not move
within the plant?
A. Contact
B. Systemic
C. Pre-emergent
D. Selective
Answer: A. Contact
Rationale: Contact herbicides kill the tissue they touch but do not translocate to
other parts of the plant.
5. What is the primary safety equipment required when applying herbicides?
A. Personal Protective Equipment (PPE)
B. Sunglasses only
C. Safety shoes only
D. Hard hat only
Answer: A. Personal Protective Equipment (PPE)
Rationale: PPE protects applicators from chemical exposure, including gloves, eye
protection, and appropriate clothing.
6. Which factor is most important to prevent herbicide drift?
A. Wind speed and direction
B. Soil type
C. Shade cover
D. Temperature only
Answer: A. Wind speed and direction
Rationale: Drift can damage non-target plants; applying at low wind speeds
minimizes risk.
7. Which of the following is a selective herbicide?
A. 2,4-D
B. Glyphosate
C. Non-selective mixture
D. Paraquat
Answer: A. 2,4-D
, Rationale: 2,4-D selectively controls broadleaf weeds without harming most
grasses.
8. Which herbicide is non-selective and can damage or kill all vegetation it
contacts?
A. Glyphosate
B. 2,4-D
C. Atrazine
D. MCPP
Answer: A. Glyphosate
Rationale: Glyphosate is a non-selective systemic herbicide that kills most plants
upon contact.
9. Why is it important to read and follow the herbicide label?
A. It provides legal, safety, and application instructions
B. Only for storage purposes
C. Optional information
D. Marketing purposes
Answer: A. It provides legal, safety, and application instructions
Rationale: Labels are legally binding and provide essential safety and efficacy
instructions.
10. Which weed is considered an invasive groundcover in ornamental
landscapes?
A. Creeping Charlie (Glechoma hederacea)
B. Kentucky bluegrass
C. Bermuda grass
D. Fescue
Answer: A. Creeping Charlie (Glechoma hederacea)
Rationale: Creeping Charlie spreads aggressively and can crowd out ornamentals.
11. What is the ideal condition for applying most foliar herbicides?
A. Dry leaves, low wind, moderate temperature
B. Rainy conditions
C. Strong winds
