CAC Pest Management & Integrated Pest Management (IPM) 1 — Questions and Answers
Question 1: What is the primary goal of Integrated Pest Management (IPM)?
- Eliminate all pest populations using maximum pesticide rates
- Manage pests to economically acceptable levels using multiple strategies while minimizing risks (Correct answer)
- Rely exclusively on biological control agents
- Apply pesticides on a fixed calendar schedule
Correct answer: Manage pests to economically acceptable levels using multiple strategies while minimizing risks
IPM aims to keep pest populations below economically damaging thresholds using a combination of cultural, biological, physical, and chemical tactics to minimize environmental and health risks.
Question 2: The Economic Threshold (ET) in pest management is defined as the pest density at which:
- Crop damage becomes visible to the naked eye
- Control actions must be taken to prevent pest populations from reaching the Economic Injury Level (Correct answer)
- All pest activity should be recorded for future reference
- The pest population has caused irreversible economic loss
Correct answer: Control actions must be taken to prevent pest populations from reaching the Economic Injury Level
The Economic Threshold is the pest population level at which management action should be initiated to prevent the pest from reaching the Economic Injury Level (EIL), where losses equal control costs.
Question 3: Which type of pest scouting method involves walking a field in a specific pattern to obtain representative pest population samples?
- Random stratified sampling
- Systematic transect scouting (Correct answer)
- Hot-spot sampling
- Border row monitoring
Correct answer: Systematic transect scouting
Systematic transect scouting involves walking predetermined paths (transects) across a field to collect unbiased, representative samples of pest populations.
Question 4: A Certified Agricultural Consultant finds aphid populations at 250 per plant on winter wheat. The economic threshold is 300 per plant. What is the most appropriate recommendation?
- Apply an insecticide immediately at the full label rate
- Continue monitoring closely as populations are below the economic threshold (Correct answer)
- Apply a biological control agent to eliminate all aphids
- No further scouting is necessary since damage has not occurred
Correct answer: Continue monitoring closely as populations are below the economic threshold
Since the population (250/plant) is below the economic threshold (300/plant), the correct action is to continue scouting to track whether populations will rise to the action level.
Question 5: Which of the following is an example of a cultural pest management practice?
- Releasing Trichogramma wasps to parasitize pest eggs
- Applying a contact insecticide during peak pest emergence
- Rotating crops to disrupt pest life cycles (Correct answer)
- Installing pheromone traps to monitor adult moth populations
Correct answer: Rotating crops to disrupt pest life cycles
Crop rotation is a cultural practice that disrupts the habitat and food supply of host-specific pests, reducing population buildup over successive seasons.
Question 6: What does the term 'action threshold' mean in the context of IPM decision-making?
- The level of pesticide concentration that kills 50% of a pest population
- The pest population density or damage level that triggers a management response (Correct answer)
- The point at which crop yield loss becomes irreversible
- The maximum allowable pesticide residue on harvested crops
Correct answer: The pest population density or damage level that triggers a management response
An action threshold is the pest population level or amount of damage at which a management action (such as pesticide application) should be initiated to prevent economic injury.
Question 7: Pheromone traps used in IPM programs are primarily used to:
- Kill adult insects before they can reproduce
- Monitor pest population activity and determine timing of management interventions (Correct answer)
- Attract and kill all life stages of target pests
- Replace the need for field scouting entirely
Correct answer: Monitor pest population activity and determine timing of management interventions
Pheromone traps attract target insects using synthetic sex or aggregation pheromones and are primarily used to monitor pest presence, flight activity, and population trends to guide management timing.
CAC Pest Management & Integrated Pest Management (IPM) 1
What is the primary goal of Integrated Pest Management (IPM)?