Integrated Pest Management (IPM) in Entomology 2026 — Crop Protection Reviewer Questions
250 board-style Integrated Pest Management (IPM) in Entomology 2026 items for the Agriculturist Licensure Examination, free and open to every examinee. Group pesticides by mode of action rather than by trade name. The examination asks about resistance management far more often than about products.
250 questions in this topic · part of Crop Protection · every answer explained
Practise Integrated Pest Management (IPM) in Entomology 2026 free
Sample Integrated Pest Management (IPM) in Entomology 2026 questions with answers and explanations
Board-style items taken from the Crop Protection bank. Every answer is explained, which is the part that makes a review question worth doing twice.
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A vegetable farmer finds a few aphid colonies, many lady beetles, and no measurable yield threat. Which decision best applies IPM rather than eradication?
- A. Eradicate every insect observed, including predators and parasitoids
- B. Ignore the infestation until visible yield loss has already occurred
- C. Use market value, crop stage, control cost, and expected damage to refine the action threshold
- D. Continue regular scouting and conserve natural enemies until the action threshold is reached correct
Why: IPM aims to hold a pest below the level where it costs money, not to remove it. With few aphids, abundant lady beetles and no measurable threat, the predators are already doing the work, so the correct move is to keep watching and protect them until the threshold is actually reached. Eradicating everything would remove those predators; waiting for visible loss would act too late.
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Two similar caterpillars occur in a corn field, but only one is known to cause serious whorl damage. What should the technician do before recommending control?
- A. Confirm the pest identity and quantify its population before choosing a tactic correct
- B. Wait for the pest to exceed the economic injury level before planning any action
- C. Use market value, crop stage, control cost, and expected damage to refine the action threshold
- D. Base the decision on a single plant inspected near the field entrance
Why: Nothing can be timed or targeted until it is known which of the two caterpillars is present and how many there are. Identification comes before intervention, and a count turns identity into a decision. Judging from one plant near the field entrance would not represent the field at all.
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A rice field has patchy hopperburn near one corner. Which sampling plan gives the most defensible basis for an IPM decision?
- A. Use pheromone or light traps together with direct plant inspection
- B. Sample at regular intervals and during critical crop stages
- C. Use crop damage alone without confirming the causal organism
- D. Inspect a representative set of plants along a zigzag or W-shaped route correct
Why: Damage in one corner is exactly the situation in which a convenience sample misleads. Walking a zigzag or W-shaped route spreads the observations across the field so the estimate reflects the whole crop rather than the worst patch.
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A farmer checks a crop only after severe damage becomes visible. Which change would make the program preventive?
- A. Use crop damage alone without confirming the causal organism
- B. Sample at regular intervals and during critical crop stages correct
- C. Use the same sampling unit consistently so observations can be compared over time
- D. Rely only on farmers' memory of last season's infestation
Why: Checking only after severe damage has appeared can never be preventive, because the decision point has already passed. Sampling on a regular interval, and at the crop stages when injury matters most, is what allows action before loss occurs.
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Pest density is rising but remains below the action threshold. Which response is most appropriate?
- A. Apply a broad-spectrum insecticide immediately across the entire field
- B. Continue regular scouting and conserve natural enemies until the action threshold is reached correct
- C. Base the decision on a single plant inspected near the field entrance
- D. Resample the field after the intervention and compare pest density with the threshold
Why: The threshold is the trigger; below it, treatment costs more than the damage it prevents. Continuing to scout keeps the rising trend in view, and conserving natural enemies may keep the population from reaching the threshold at all.
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A grower proposes waiting until pest injury equals the cost of control. Which correction should the adviser make?
- A. Use crop age alone and ignore pest density
- B. Treat whenever a single insect is found
- C. Wait until the EIL has been exceeded for several weeks
- D. Use the economic threshold to act before the population reaches the economic injury level correct
Why: The economic injury level is the point at which loss equals control cost, so acting there means the loss has already been incurred. The economic threshold sits deliberately below it, giving time for a treatment to work before that point is reached.
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Mango prices increase sharply before harvest, making cosmetic injury more costly. How should the decision threshold generally be adjusted?
- A. Ignore cosmetic injury because yield is unchanged
- B. Raise the threshold because fruit value is higher
- C. Keep the threshold fixed under all market conditions
- D. Use a lower action threshold because each unit of injury now causes greater economic loss correct
Why: The threshold is an economic quantity, not a biological constant. When the crop is worth more, each unit of injury costs more, so the density that justifies treatment falls. Raising the threshold would be the opposite of what higher value implies.
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The cost of an effective treatment doubles while crop price remains constant. How should the manager reassess the decision?
- A. Keep the old threshold because pest biology is unchanged
- B. Recalculate the action threshold because the economics of treatment have changed correct
- C. Treat at a lower density regardless of benefit
- D. Apply twice the label rate to recover the higher cost
Why: A threshold balances the value of damage prevented against the cost of preventing it. If control now costs twice as much, that balance has moved and the threshold must be recomputed. Pest biology has not changed, but the economics that the threshold encodes have.
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