Free Certified Horticulturist Pest and Disease Management Questions and Answers — Questions and Answers
Question 1: Which of the following is an example of an Integrated Pest Management (IPM) practice?
- Applying chemical pesticides preventively
- Introducing natural predators to control pests (Correct answer)
- Eliminating all insects from the environment
- Only using organic pesticides
Correct answer: Introducing natural predators to control pests
Integrated Pest Management (IPM) is a comprehensive approach to pest control that prioritizes long-term prevention and suppression with minimal environmental impact. Introducing natural predators, such as beneficial insects or microorganisms, is a key biological control strategy within IPM. This method targets pests without relying solely on chemical pesticides, aligning with IPM's goal of sustainable pest management.
Question 2: What is the primary sign of powdery mildew infection?
- Water-soaked lesions on leaves
- White, powdery coating on leaves (Correct answer)
- Brown or black leaf spots with yellow halos
- Webbing on plant stems and leaves
Correct answer: White, powdery coating on leaves
Powdery mildew is a common fungal disease easily identified by its distinctive appearance on plants. The primary sign of infection is a white or grayish powdery coating that forms on the surface of leaves, stems, and sometimes flowers and fruits. This powdery substance is composed of fungal spores and mycelia, making it a clear diagnostic symptom.
Question 3: Which pest is most commonly associated with honeydew production on plants?
- Aphids (Correct answer)
- Japanese beetles
- Spider mites
- Caterpillars
Correct answer: Aphids
Aphids are small, sap-sucking insects that feed on plant juices, often found in clusters on new growth or the undersides of leaves. As they feed, they excrete a sticky, sugary waste product called honeydew. This honeydew can then lead to the growth of sooty mold, which is a common secondary sign of an aphid infestation.
Question 4: What is a primary cultural practice to reduce the risk of root rot in plants?
- Watering heavily every day
- Planting in poorly drained soils
- Avoiding overhead irrigation
- Ensuring proper drainage in soil or containers (Correct answer)
Correct answer: Ensuring proper drainage in soil or containers
Root rot is a destructive plant disease caused by fungi or oomycetes that thrive in waterlogged, oxygen-deprived soil conditions. Ensuring proper drainage in soil or containers is crucial because it prevents excess water from accumulating around the roots. This allows roots to access necessary oxygen and reduces the anaerobic environment favored by root rot pathogens, thereby promoting healthy root development.
Question 5: What type of pest is controlled using Bacillus thuringiensis (Bt)?
- Fungal pathogens
- Nematodes
- Caterpillars and larvae (Correct answer)
- Aphids
Correct answer: Caterpillars and larvae
Bacillus thuringiensis (Bt) is a naturally occurring bacterium widely used as a biological pesticide. It produces protein crystals that are toxic specifically to the larvae of certain insect orders, most notably caterpillars (Lepidoptera) and some beetle larvae, when ingested. Bt is valued for its selective action, as it generally does not harm beneficial insects, humans, or other animals.
Free Certified Horticulturist Pest and Disease Management Questions and Answers
Which of the following is an example of an Integrated Pest Management (IPM) practice?