Principles of Crop Protection (Plant Pathology) — Crop Protection Reviewer Questions

700 board-style Principles of Crop Protection (Plant Pathology) items for the Agriculturist Licensure Examination. Try 40 questions free; lifetime access is ₱49. Group pesticides by mode of action rather than by trade name. The examination asks about resistance management far more often than about products.

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Sample Principles of Crop Protection (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.

A municipal agriculturist is planning a program that addresses rice insects, rats, diseases, and weeds in one framework. Which description best matches the scope of crop protection?
- A. Managing harmful organisms that damage agricultural crops correct
- B. Improving crop yield only through fertilizer use
- C. Managing only insect pests with insecticides
- D. Breeding crops without considering pest problems
Why: Crop protection covers management of invertebrate and vertebrate pests, plant diseases, weeds, and other harmful organisms, not only insects.
A farmer notices birds feeding on newly sown corn. In crop protection, when is the bird population appropriately regarded as a pest?
- A. Only after a pesticide has been applied
- B. When its activity causes unacceptable harm to the crop or other human interests correct
- C. Whenever the species is present in the farm
- D. Only when the species is an insect vector
Why: An organism is treated as a pest because of harmful effects on crops or human interests, not simply because it is present.
A rice field has both planthoppers and spiders that prey on planthoppers. Which organism should not automatically be classified as a pest?
- A. A weed competing with rice seedlings
- B. A disease-causing fungus
- C. The predatory spiders correct
- D. The planthoppers feeding on rice
Why: Beneficial natural enemies can suppress pests; presence in a field does not make an organism a pest.
Which outcome most directly represents an economic demerit of a crop pest?
- A. Improved pollination of flowers
- B. Increased soil aeration by beneficial organisms
- C. Use of microbes in scientific studies
- D. Lower marketable yield and reduced crop quality correct
Why: Pests can reduce yield and quality and create financial losses, whereas the other choices are beneficial roles.
A mango grower spends more on sorting because many fruits have pest blemishes although total fruit number is unchanged. Which pest effect is most evident?
- A. Reduction in product quality and value correct
- B. Improved pollination efficiency
- C. Greater soil porosity
- D. Increase in crop genetic diversity
Why: Visible damage can lower grade and market value even when total quantity changes little.
A pest outbreak makes commercial production of a susceptible crop impractical in one province. Which economic effect of pests does this illustrate?
- A. Promoting diversification of beneficial microbes
- B. Limiting the kinds of crops and industries viable in an area correct
- C. Increasing the food value of pest organisms
- D. Improving natural biological control
Why: Severe pest pressure can restrict what crops or industries can be economically sustained in a location.
A crop protection class discusses bees, predatory insects, and some microorganisms. Why can organisms associated with agriculture have economic merits as well as demerits?
- A. All microorganisms increase crop disease
- B. Every organism becomes a pest at high population density
- C. Some provide services or products such as pollination, biological regulation, food, or useful compounds correct
- D. Only vertebrates provide useful agricultural services
Why: Agricultural organisms may provide beneficial ecosystem services or useful products even though other species or populations are harmful.
Penicillium is discussed in a crop protection lecture even though some fungi cause crop disease. Which point does this best illustrate?
- A. All fungi are harmless saprophytes
- B. Only insects have both beneficial and harmful roles
- C. Disease-causing organisms are never economically useful
- D. A group containing pathogens can also include organisms useful to people correct
Why: Fungi include harmful pathogens and beneficial species, including sources of useful compounds such as antibiotics.

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Principles of Crop Protection (Plant Pathology) — Crop Protection Reviewer Questions

Sample Principles of Crop Protection (Plant Pathology) questions with answers and explanations

A municipal agriculturist is planning a program that addresses rice insects, rats, diseases, and weeds in one framework. Which description best matches the scope of crop protection?

A farmer notices birds feeding on newly sown corn. In crop protection, when is the bird population appropriately regarded as a pest?

A rice field has both planthoppers and spiders that prey on planthoppers. Which organism should not automatically be classified as a pest?

Which outcome most directly represents an economic demerit of a crop pest?

A mango grower spends more on sorting because many fruits have pest blemishes although total fruit number is unchanged. Which pest effect is most evident?

A pest outbreak makes commercial production of a susceptible crop impractical in one province. Which economic effect of pests does this illustrate?

A crop protection class discusses bees, predatory insects, and some microorganisms. Why can organisms associated with agriculture have economic merits as well as demerits?

Penicillium is discussed in a crop protection lecture even though some fungi cause crop disease. Which point does this best illustrate?

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