Integrated Pest Management (IPM) in Plant Pathology — Crop Protection Reviewer Questions

250 board-style Integrated Pest Management (IPM) in Plant Pathology 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 built-in questions in this topic · approved additions may publish live · part of Crop Protection

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Sample Integrated Pest Management (IPM) in Plant Pathology 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.

After three days of flooding in a Nueva Ecija rice field, plants in the lowest portions wilt and yellow, but no bacterial ooze, fungal structures, or progressive lesions are observed. What is the most appropriate first IPM decision?
- A. Apply a broad-spectrum fungicide immediately without further diagnosis.
- B. Assess drainage and root-zone oxygen stress before prescribing a pesticide. correct
- C. Increase nitrogen fertilizer to stimulate rapid new growth.
- D. Remove all plants in the field before checking the distribution of symptoms.
Why: A low-lying distribution after flooding strongly points to an abiotic component. Correct diagnosis prevents unnecessary pesticide use and addresses the environmental side of the disease triangle.
A tomato block in Bukidnon shows wilt only in rows next to a leaking irrigation line. Plants recover partially overnight. What should the crop protection officer do first?
- A. Apply a broad-spectrum fungicide immediately without further diagnosis.
- B. Increase nitrogen fertilizer to stimulate rapid new growth.
- C. Remove all plants in the field before checking the distribution of symptoms.
- D. Check soil moisture, root condition, and vascular discoloration to separate water stress from vascular disease. correct
Why: Temporary recovery and a pattern linked to irrigation can mimic infectious wilt. Field pattern plus plant examination should precede control recommendations.
Cabbage clubroot becomes severe in an acidic upland field. Which change best uses the disease triangle to reduce disease pressure in the next crop?
- A. Raise soil pH toward a less favorable range for clubroot while improving drainage. correct
- B. Apply a broad-spectrum fungicide immediately without further diagnosis.
- C. Increase nitrogen fertilizer to stimulate rapid new growth.
- D. Remove all plants in the field before checking the distribution of symptoms.
Why: Changing soil conditions can make the environment less favorable for the pathogen and complement sanitation and resistant cultivars.
A potato grower plans to heavily lime a field with a history of common scab. Which IPM advice is most appropriate?
- A. Apply a broad-spectrum fungicide immediately without further diagnosis.
- B. Increase nitrogen fertilizer to stimulate rapid new growth.
- C. Avoid excessive liming and manage soil pH so conditions are less favorable to common scab. correct
- D. Remove all plants in the field before checking the distribution of symptoms.
Why: The module notes that crop management can manipulate soil pH; potato scab is favored by higher pH, so indiscriminate liming can increase risk.
Leaf spots increase in a densely planted vegetable crop after repeated humid nights and prolonged leaf wetness. Which intervention best targets the environmental component of disease?
- A. Apply a broad-spectrum fungicide immediately without further diagnosis.
- B. Improve canopy aeration and shift irrigation to reduce the duration of leaf wetness. correct
- C. Increase nitrogen fertilizer to stimulate rapid new growth.
- D. Remove all plants in the field before checking the distribution of symptoms.
Why: Many foliar pathogens require prolonged moisture. Reducing leaf wetness interrupts infection without relying only on chemicals.
Papaya leaves on the western edge of a field develop pale, scorched areas after an extreme heat event, while interior plants remain unaffected and no signs of a pathogen are present. What should be done first?
- A. Apply a broad-spectrum fungicide immediately without further diagnosis.
- B. Increase nitrogen fertilizer to stimulate rapid new growth.
- C. Remove all plants in the field before checking the distribution of symptoms.
- D. Treat the problem as possible sunscald or heat injury and verify before applying disease-control chemicals. correct
Why: A directional field pattern following heat exposure is more consistent with abiotic injury than an infectious epidemic.
Tomato fruits develop blossom-end rot after alternating drought and heavy irrigation, with no pathogen signs. What IPM response is most appropriate?
- A. Stabilize soil moisture and correct the crop's calcium-water balance rather than applying a fungicide. correct
- B. Apply a broad-spectrum fungicide immediately without further diagnosis.
- C. Increase nitrogen fertilizer to stimulate rapid new growth.
- D. Remove all plants in the field before checking the distribution of symptoms.
Why: Blossom-end rot is a physiological disorder associated with water and calcium transport, so pathogen-targeted treatment is not the best response.
A vegetable field develops uniform marginal leaf burn within 24 hours after a pesticide tank mix was applied. Neighboring unsprayed plots remain healthy. What is the best next step?
- A. Apply a broad-spectrum fungicide immediately without further diagnosis.
- B. Increase nitrogen fertilizer to stimulate rapid new growth.
- C. Investigate phytotoxicity, application rate, and mixing history before diagnosing an infectious disease. correct
- D. Remove all plants in the field before checking the distribution of symptoms.
Why: Rapid, uniform injury tied to a spray event strongly suggests an abiotic pesticide injury; diagnosis should precede further treatment.

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Integrated Pest Management (IPM) in Plant Pathology — Crop Protection Reviewer Questions

Sample Integrated Pest Management (IPM) in Plant Pathology questions with answers and explanations

After three days of flooding in a Nueva Ecija rice field, plants in the lowest portions wilt and yellow, but no bacterial ooze, fungal structures, or progressive lesions are observed. What is the most appropriate first IPM decision?

A tomato block in Bukidnon shows wilt only in rows next to a leaking irrigation line. Plants recover partially overnight. What should the crop protection officer do first?

Cabbage clubroot becomes severe in an acidic upland field. Which change best uses the disease triangle to reduce disease pressure in the next crop?

A potato grower plans to heavily lime a field with a history of common scab. Which IPM advice is most appropriate?

Leaf spots increase in a densely planted vegetable crop after repeated humid nights and prolonged leaf wetness. Which intervention best targets the environmental component of disease?

Papaya leaves on the western edge of a field develop pale, scorched areas after an extreme heat event, while interior plants remain unaffected and no signs of a pathogen are present. What should be done first?

Tomato fruits develop blossom-end rot after alternating drought and heavy irrigation, with no pathogen signs. What IPM response is most appropriate?

A vegetable field develops uniform marginal leaf burn within 24 hours after a pesticide tank mix was applied. Neighboring unsprayed plots remain healthy. What is the best next step?

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