Ohio Pesticide Applicator Certification:
Category 6a – Ornamental Weed
Control Exam With Actual Questions &
Verified Answers ,Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Update/Instant Download Pdf
Ohio Category 6a – Ornamental Weed Control Exam
1. Which weed type is most commonly controlled in ornamental
beds using preemergent herbicides?
A. Established perennial weeds
B. Woody shrubs
C. Annual weed seeds
D. Moss
C
Preemergents stop seed germination. They don’t touch established
weeds.
2. Which herbicide characteristic matters most when applying near
sensitive ornamentals?
A. Water solubility only
B. Vapor pressure
,C. pH of carrier water
D. Container size
B
High vapor-pressure herbicides can volatilize and smoke nearby
ornamentals.
3. In Ohio, Category 6a covers weed control in which setting?
A. Agricultural crops
B. Turfgrass lawns
C. Ornamental plantings
D. Forestry plantations
C
6a is strictly ornamental beds and landscapes, not turf or ag.
4. A systemic herbicide works by:
A. Scorching leaves on contact only
B. Moving inside the plant to roots
C. Remaining on soil surface with no uptake
D. Killing only seeds
B
Systemics translocate to meristems and kill roots—critical for
perennials.
5. Which factor most reduces herbicide drift risk?
A. High nozzle pressure
B. Small droplet size
C. Low wind speed
D. Using hollow-cone nozzles
C
Wind is the king of drift problems. Low wind = lower risk.
, 6. When should postemergent herbicides be applied for best
results?
A. To drought-stressed weeds
B. During rainfall
C. When weeds are young and actively growing
D. During freezing conditions
C
Young, unstressed weeds absorb herbicides far better.
7. What is the primary reason to rotate herbicide modes of action?
A. Increase product cost
B. Reduce sprayer load
C. Prevent herbicide resistance
D. Improve fragrance of spray solution
C
Repeating one mode invites resistant weed populations.
8. Which formulation is typically safest around ornamentals
because it reduces volatility?
A. Ester formulations
B. Oil-based concentrates
C. Amine formulations
D. Dust formulations
C
Amines are less volatile than esters—safer near sensitive plants.
9. A contact herbicide is best suited for:
A. Deep-rooted perennials
B. Woody brush
C. Small annual weeds
D. Bulbous ornamentals
Category 6a – Ornamental Weed
Control Exam With Actual Questions &
Verified Answers ,Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Update/Instant Download Pdf
Ohio Category 6a – Ornamental Weed Control Exam
1. Which weed type is most commonly controlled in ornamental
beds using preemergent herbicides?
A. Established perennial weeds
B. Woody shrubs
C. Annual weed seeds
D. Moss
C
Preemergents stop seed germination. They don’t touch established
weeds.
2. Which herbicide characteristic matters most when applying near
sensitive ornamentals?
A. Water solubility only
B. Vapor pressure
,C. pH of carrier water
D. Container size
B
High vapor-pressure herbicides can volatilize and smoke nearby
ornamentals.
3. In Ohio, Category 6a covers weed control in which setting?
A. Agricultural crops
B. Turfgrass lawns
C. Ornamental plantings
D. Forestry plantations
C
6a is strictly ornamental beds and landscapes, not turf or ag.
4. A systemic herbicide works by:
A. Scorching leaves on contact only
B. Moving inside the plant to roots
C. Remaining on soil surface with no uptake
D. Killing only seeds
B
Systemics translocate to meristems and kill roots—critical for
perennials.
5. Which factor most reduces herbicide drift risk?
A. High nozzle pressure
B. Small droplet size
C. Low wind speed
D. Using hollow-cone nozzles
C
Wind is the king of drift problems. Low wind = lower risk.
, 6. When should postemergent herbicides be applied for best
results?
A. To drought-stressed weeds
B. During rainfall
C. When weeds are young and actively growing
D. During freezing conditions
C
Young, unstressed weeds absorb herbicides far better.
7. What is the primary reason to rotate herbicide modes of action?
A. Increase product cost
B. Reduce sprayer load
C. Prevent herbicide resistance
D. Improve fragrance of spray solution
C
Repeating one mode invites resistant weed populations.
8. Which formulation is typically safest around ornamentals
because it reduces volatility?
A. Ester formulations
B. Oil-based concentrates
C. Amine formulations
D. Dust formulations
C
Amines are less volatile than esters—safer near sensitive plants.
9. A contact herbicide is best suited for:
A. Deep-rooted perennials
B. Woody brush
C. Small annual weeds
D. Bulbous ornamentals
