CCA - Certified Crop Advisor Integrated Pest Management Questions and Answers — Questions and Answers
Question 1: Which of the following best defines the Economic Threshold (ET) in an Integrated Pest Management (IPM) program?
- The pest density at which control measures should be applied to prevent the pest population from reaching the Economic Injury Level. (Correct answer)
- The lowest pest population density that will cause economic damage.
- The point at which pest damage is visible in the field, justifying the cost of scouting.
- The maximum pest population that can be tolerated without any yield loss.
Correct answer: The pest density at which control measures should be applied to prevent the pest population from reaching the Economic Injury Level.
The Economic Threshold (ET), also known as the Action Threshold, is the point at which a pest population is projected to reach the Economic Injury Level (EIL) if no management action is taken. Therefore, it is the trigger point for implementing control measures to prevent economic loss.
Question 2: A grower is experiencing significant corn rootworm damage despite rotating corn with soybeans. Some adult rootworms are observed laying eggs in the soybean field. Which cultural control practice would be most effective in this scenario to disrupt the pest life cycle?
- Planting a different non-host crop, such as alfalfa or wheat, for at least one year. (Correct answer)
- Adjusting the corn planting date to be much earlier in the season.
- Increasing the seeding rate of the subsequent corn crop to compensate for damage.
- Applying a soil insecticide during soybean planting to target egg-laying adults.
Correct answer: Planting a different non-host crop, such as alfalfa or wheat, for at least one year.
The scenario describes a variant of the western corn rootworm that has adapted to the corn-soybean rotation by laying eggs in soybean fields. Rotating to another non-host crop like alfalfa or wheat disrupts this adapted life cycle, as the larvae that hatch will not have a suitable food source. Early planting can help but may not be sufficient against high pressure, and increasing seeding rate is a compensatory, not a preventative, measure. Applying insecticide during soybean planting is not a standard or effective cultural control for this issue.
Question 3: The release of mass-reared lady beetles to control an aphid population in a greenhouse is an example of which type of biological control?
- Augmentative (Correct answer)
- Classical
- Conservation
- Competitive
Correct answer: Augmentative
Augmentative biological control involves the periodic release of natural enemies, like lady beetles, to supplement the existing population and suppress a pest. Classical biological control is the introduction of a non-native natural enemy to control an invasive pest, with the goal of permanent establishment. Conservation biological control focuses on practices that protect and enhance existing populations of natural enemies.
Question 4: To effectively manage pesticide resistance, a key IPM strategy is to rotate pesticides with different modes of action (MOA). Why is this practice recommended?
- It prevents the selection and buildup of resistant individuals within the pest population. (Correct answer)
- It ensures that all pesticides in a chemical family are used up before their expiration date.
- It reduces the total amount of pesticide active ingredient applied to the field over a season.
- It enhances the effectiveness of beneficial insects that may be present in the field.
Correct answer: It prevents the selection and buildup of resistant individuals within the pest population.
Repeatedly using pesticides with the same mode of action selects for the few individuals in a pest population that are naturally resistant. These individuals survive and reproduce, leading to a resistant population. By rotating to a different MOA, you target pests in a different way, making it less likely for resistance to a single mode of action to develop.
Question 5: Which of the following is NOT considered a fundamental component of an Integrated Pest Management (IPM) program?
- Scheduled, calendar-based pesticide applications. (Correct answer)
- Regular monitoring and scouting of pest populations.
- Use of economic thresholds to guide control decisions.
- Integration of multiple control tactics (cultural, biological, chemical).
Correct answer: Scheduled, calendar-based pesticide applications.
A core principle of IPM is to move away from preventative, calendar-based spraying. Instead, actions are taken based on monitoring and economic thresholds, ensuring that controls are applied only when necessary. The other options are all essential elements of a robust IPM program.
Question 6: A Certified Crop Advisor scouts a field and identifies a pest population that is approaching the Economic Threshold. According to IPM principles, what is the most appropriate next step?
- Evaluate and select an appropriate control measure to be implemented. (Correct answer)
- Wait until the population reaches the Economic Injury Level before taking action.
- Immediately apply a broad-spectrum insecticide to prevent any further increase.
- Discontinue scouting for the remainder of the season as the pest is now established.
Correct answer: Evaluate and select an appropriate control measure to be implemented.
The Economic Threshold (ET) is the signal to take action to prevent the pest population from reaching the Economic Injury Level (EIL), where economic losses occur. Therefore, once the ET is approached or reached, the next step is to select and implement a suitable control tactic. Waiting for the EIL means economic losses are already beginning. A broad-spectrum insecticide may not be the most appropriate choice; IPM favors selecting the most effective and least disruptive option.
CCA - Certified Crop Advisor Integrated Pest Management Questions and Answers
Which of the following best defines the Economic Threshold (ET) in an Integrated Pest Management (IPM) program?