Indiana Commercial Pesticide Applicator
Category 3a – Ornamental Pest Management
Examination Practice Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which of the following is the most effective method for controlling
aphid populations on ornamental plants?
A. Handpicking insects
B. Using insecticidal soaps or horticultural oils
C. Applying nitrogen-rich fertilizer
D. Increasing watering frequency
Rationale: Insecticidal soaps and horticultural oils are effective
against soft-bodied insects like aphids without harming plants.
2. What is the main symptom of spider mite infestation on ornamental
plants?
A. Wilting of roots
, B. Stippling or tiny yellow spots on leaves
C. Large holes in leaves
D. Fungal growth on stems
Rationale: Spider mites feed on plant cells, causing stippling on
leaves and potential leaf drop.
3. Which environmental factor contributes most to the proliferation of
powdery mildew on ornamentals?
A. Excessive rainfall
B. High humidity and moderate temperatures
C. Low soil fertility
D. Strong wind
Rationale: Powdery mildew thrives in humid, moderate conditions
and is less dependent on rainfall.
4. What is the main goal of integrated pest management (IPM) in
ornamental pest control?
A. Eradicate all pests immediately
B. Increase pesticide use
C. Manage pest populations while minimizing risks to humans and
the environment
D. Promote plant growth at any cost
Rationale: IPM combines cultural, mechanical, biological, and
chemical methods to manage pests responsibly.
,5. Which of the following is considered a biological control agent for
ornamental pests?
A. Neem oil
B. Captan
C. Lady beetles
D. Copper fungicide
Rationale: Lady beetles are natural predators of aphids and other
soft-bodied insects.
6. When applying a systemic insecticide to a landscape tree, the most
effective method is:
A. Foliar spray
B. Soil drench at the trunk base
C. Trunk injection
D. Watering from a distance
Rationale: Trunk injection delivers systemic insecticides directly into
the vascular system for effective pest control.
7. Which of the following ornamental pests is an example of a chewing
insect?
A. Aphids
B. Japanese beetle
C. Whiteflies
D. Spider mites
, Rationale: Chewing insects like Japanese beetles consume leaf tissue,
causing visible damage.
8. What is the main symptom of root knot nematode infestation in
ornamentals?
A. Powdery coating on leaves
B. Gall formation on roots
C. Leaf chlorosis
D. Wilting only during midday
Rationale: Root knot nematodes induce galls or swellings on roots,
disrupting water and nutrient uptake.
9. Which of the following practices reduces the risk of fungal diseases in
ornamental landscapes?
A. Applying high-nitrogen fertilizer
B. Proper spacing and pruning for air circulation
C. Frequent overhead irrigation at night
D. Increasing mulch thickness over stems
Rationale: Good spacing and pruning improve airflow and reduce
humidity, limiting fungal growth.
10. What is the first step in diagnosing an ornamental pest problem?
A. Apply a broad-spectrum pesticide
B. Identify the pest and understand its biology
C. Remove all affected plants
D. Increase watering
Category 3a – Ornamental Pest Management
Examination Practice Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which of the following is the most effective method for controlling
aphid populations on ornamental plants?
A. Handpicking insects
B. Using insecticidal soaps or horticultural oils
C. Applying nitrogen-rich fertilizer
D. Increasing watering frequency
Rationale: Insecticidal soaps and horticultural oils are effective
against soft-bodied insects like aphids without harming plants.
2. What is the main symptom of spider mite infestation on ornamental
plants?
A. Wilting of roots
, B. Stippling or tiny yellow spots on leaves
C. Large holes in leaves
D. Fungal growth on stems
Rationale: Spider mites feed on plant cells, causing stippling on
leaves and potential leaf drop.
3. Which environmental factor contributes most to the proliferation of
powdery mildew on ornamentals?
A. Excessive rainfall
B. High humidity and moderate temperatures
C. Low soil fertility
D. Strong wind
Rationale: Powdery mildew thrives in humid, moderate conditions
and is less dependent on rainfall.
4. What is the main goal of integrated pest management (IPM) in
ornamental pest control?
A. Eradicate all pests immediately
B. Increase pesticide use
C. Manage pest populations while minimizing risks to humans and
the environment
D. Promote plant growth at any cost
Rationale: IPM combines cultural, mechanical, biological, and
chemical methods to manage pests responsibly.
,5. Which of the following is considered a biological control agent for
ornamental pests?
A. Neem oil
B. Captan
C. Lady beetles
D. Copper fungicide
Rationale: Lady beetles are natural predators of aphids and other
soft-bodied insects.
6. When applying a systemic insecticide to a landscape tree, the most
effective method is:
A. Foliar spray
B. Soil drench at the trunk base
C. Trunk injection
D. Watering from a distance
Rationale: Trunk injection delivers systemic insecticides directly into
the vascular system for effective pest control.
7. Which of the following ornamental pests is an example of a chewing
insect?
A. Aphids
B. Japanese beetle
C. Whiteflies
D. Spider mites
, Rationale: Chewing insects like Japanese beetles consume leaf tissue,
causing visible damage.
8. What is the main symptom of root knot nematode infestation in
ornamentals?
A. Powdery coating on leaves
B. Gall formation on roots
C. Leaf chlorosis
D. Wilting only during midday
Rationale: Root knot nematodes induce galls or swellings on roots,
disrupting water and nutrient uptake.
9. Which of the following practices reduces the risk of fungal diseases in
ornamental landscapes?
A. Applying high-nitrogen fertilizer
B. Proper spacing and pruning for air circulation
C. Frequent overhead irrigation at night
D. Increasing mulch thickness over stems
Rationale: Good spacing and pruning improve airflow and reduce
humidity, limiting fungal growth.
10. What is the first step in diagnosing an ornamental pest problem?
A. Apply a broad-spectrum pesticide
B. Identify the pest and understand its biology
C. Remove all affected plants
D. Increase watering
