Ohio Pesticide Applicator Certification
Category 6a – Ornamental Weed Control Questions
and Correct Answers | 2025/2026 New Update|
Graded A| Instant Download
1. What is the primary focus of Category 6a certification in Ohio?
A. Agricultural crop weed control
B. Public health pest management
C. Ornamental weed control around landscaped areas
D. Structural fumigation
Correct Answer: C
2. Which herbicide type prevents weed seed germination?
A. Postemergence
B. Preemergence
C. Nonselective
D. Contact
Correct Answer: B
3. Which weeds are most effectively controlled by postemergence systemic
herbicides?
A. Annual grasses
B. Perennial weeds
C. Liverworts
D. Mosses
Correct Answer: B
4. Which formulation is safest around sensitive ornamentals?
,A. Emulsifiable concentrate
B. Granular
C. Water-soluble concentrate
D. Ultra-low-volume
Correct Answer: B
5. Drift is most influenced by:
A. Soil pH
B. Humidity
C. Wind speed
D. Fertility levels
Correct Answer: C
6. Which weather condition increases volatility of ester herbicides?
A. Cold temperatures
B. High humidity
C. High temperatures
D. Cloudy skies
Correct Answer: C
7. What soil condition reduces effectiveness of preemergence herbicides?
A. Moist soil
B. High organic matter
C. Low microbial activity
D. Neutral pH
Correct Answer: B
8. Systemic herbicides work by moving through which plant tissues?
A. Xylem and phloem
B. Epidermis only
C. Leaf cuticle only
,D. Root hairs only
Correct Answer: A
9. Ohio commercial applicators must keep pesticide records for:
A. 3 months
B. 1 year
C. 3 years
D. 5 years
Correct Answer: C
10. Which weed reproduction method poses the biggest challenge for control?
A. Seed only
B. Rhizomes and stolons
C. Wind dispersal
D. Taproot only
Correct Answer: B
11. Biennial weeds are best controlled during which stage?
A. Rosette stage
B. Bolting stage
C. Flowering
D. Seed dispersal
Correct Answer: A
12. What is the primary reason to rotate herbicide modes of action?
A. Improve drift control
B. Reduce staining
C. Prevent herbicide resistance
D. Lower cost
Correct Answer: C
13. Which nozzle type reduces drift risk?
, A. Hollow cone
B. Flat fan
C. Air-induction
D. Twin jet
Correct Answer: C
14. Which is a symptom of herbicide injury on ornamentals?
A. Uniform, dark-green leaves
B. Distorted or cupped foliage
C. Rapid root growth
D. Enhanced flowering
Correct Answer: B
15. A nonselective herbicide should be used:
A. On ornamental flower beds
B. Only on established lawns
C. Along fence lines or cracks
D. Around young shrubs
Correct Answer: C
16. What is the best indicator of a herbicide’s toxicity?
A. Signal word
B. Formulation type
C. Odor
D. Solubility
Correct Answer: A
17. The signal word “WARNING” indicates what level of toxicity?
A. Low
B. Moderate
C. High
Category 6a – Ornamental Weed Control Questions
and Correct Answers | 2025/2026 New Update|
Graded A| Instant Download
1. What is the primary focus of Category 6a certification in Ohio?
A. Agricultural crop weed control
B. Public health pest management
C. Ornamental weed control around landscaped areas
D. Structural fumigation
Correct Answer: C
2. Which herbicide type prevents weed seed germination?
A. Postemergence
B. Preemergence
C. Nonselective
D. Contact
Correct Answer: B
3. Which weeds are most effectively controlled by postemergence systemic
herbicides?
A. Annual grasses
B. Perennial weeds
C. Liverworts
D. Mosses
Correct Answer: B
4. Which formulation is safest around sensitive ornamentals?
,A. Emulsifiable concentrate
B. Granular
C. Water-soluble concentrate
D. Ultra-low-volume
Correct Answer: B
5. Drift is most influenced by:
A. Soil pH
B. Humidity
C. Wind speed
D. Fertility levels
Correct Answer: C
6. Which weather condition increases volatility of ester herbicides?
A. Cold temperatures
B. High humidity
C. High temperatures
D. Cloudy skies
Correct Answer: C
7. What soil condition reduces effectiveness of preemergence herbicides?
A. Moist soil
B. High organic matter
C. Low microbial activity
D. Neutral pH
Correct Answer: B
8. Systemic herbicides work by moving through which plant tissues?
A. Xylem and phloem
B. Epidermis only
C. Leaf cuticle only
,D. Root hairs only
Correct Answer: A
9. Ohio commercial applicators must keep pesticide records for:
A. 3 months
B. 1 year
C. 3 years
D. 5 years
Correct Answer: C
10. Which weed reproduction method poses the biggest challenge for control?
A. Seed only
B. Rhizomes and stolons
C. Wind dispersal
D. Taproot only
Correct Answer: B
11. Biennial weeds are best controlled during which stage?
A. Rosette stage
B. Bolting stage
C. Flowering
D. Seed dispersal
Correct Answer: A
12. What is the primary reason to rotate herbicide modes of action?
A. Improve drift control
B. Reduce staining
C. Prevent herbicide resistance
D. Lower cost
Correct Answer: C
13. Which nozzle type reduces drift risk?
, A. Hollow cone
B. Flat fan
C. Air-induction
D. Twin jet
Correct Answer: C
14. Which is a symptom of herbicide injury on ornamentals?
A. Uniform, dark-green leaves
B. Distorted or cupped foliage
C. Rapid root growth
D. Enhanced flowering
Correct Answer: B
15. A nonselective herbicide should be used:
A. On ornamental flower beds
B. Only on established lawns
C. Along fence lines or cracks
D. Around young shrubs
Correct Answer: C
16. What is the best indicator of a herbicide’s toxicity?
A. Signal word
B. Formulation type
C. Odor
D. Solubility
Correct Answer: A
17. The signal word “WARNING” indicates what level of toxicity?
A. Low
B. Moderate
C. High
