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WASHINGTON PESTICIDE LAWS AND SAFETY: IPM PRINCIPLES, ECONOMIC THRESHOLDS, AND
PESTICIDE SAFETY Original Questions with Answers and Rationales
Section 1: IPM Fundamentals and Economic Thresholds
(Questions)
1. What is Integrated Pest Management (IPM)?
A. Using only chemical pesticides to eliminate all pests
B. A comprehensive approach combining cultural,
biological, mechanical, and chemical methods to manage
pests economically and environmentally
C. Eliminating all pests permanently
D. Using pesticides only when pests are visible
Answer: B
Rationale: IPM integrates multiple pest management
strategies—cultural, biological, mechanical, and
chemical—emphasizing prevention, monitoring, and
using pesticides only when necessary to minimize
economic and environmental impact.
2. What is the first step in an IPM program?
A. Apply pesticides immediately
B. Correctly identify the pest and monitor population levels
C. Remove all vegetation
D. Apply the strongest available pesticide
Answer: B
,https://www.stuvia.com/user/performance
Rationale: Correct pest identification and monitoring are
essential first steps in IPM. Misidentification can lead to
ineffective control and unnecessary pesticide use.
Monitoring determines if and when action is needed.
3. What is the "Economic Injury Level" (EIL) in IPM?
A. The point where all pests must be eliminated
B. The lowest pest population density that causes
economic damage equal to the cost of control measures
C. The point where pesticides are no longer effective
D. The maximum pest population possible
Answer: B
Rationale: The Economic Injury Level is the pest density
at which the financial loss caused by the pest equals the
cost of treatment. Below this level, control is not
economically justified.
4. What is the "Economic Threshold" (ET) in IPM?
A. The exact pest population density where control
measures must be initiated to prevent the pest from
reaching the Economic Injury Level
B. The point where all pests are dead
C. The cost of pesticides
D. The value of the crop
Answer: A
Rationale: The Economic Threshold (action threshold) is
, https://www.stuvia.com/user/performance
the pest density at which control action should be taken
to prevent the pest population from reaching the
Economic Injury Level. It is always below the EIL.
5. How does the Economic Threshold relate to the Economic
Injury Level?
A. The ET is higher than the EIL
B. The ET is set below the EIL to allow time for control
measures to work before economic damage occurs
C. They are the same
D. The ET is unrelated to the EIL
Answer: B
Rationale: The Economic Threshold is set below the
Economic Injury Level. Control actions take time to be
effective, so treatment must begin before the pest
population reaches the EIL to prevent economic loss.
6. What factors influence the Economic Threshold for a
specific pest?
A. Only pest population
B. Crop value, cost of control, pest damage potential, and
environmental conditions
C. Only weather
D. Only pesticide availability
Answer: B
Rationale: The ET varies based on crop value (higher
WASHINGTON PESTICIDE LAWS AND SAFETY: IPM PRINCIPLES, ECONOMIC THRESHOLDS, AND
PESTICIDE SAFETY Original Questions with Answers and Rationales
Section 1: IPM Fundamentals and Economic Thresholds
(Questions)
1. What is Integrated Pest Management (IPM)?
A. Using only chemical pesticides to eliminate all pests
B. A comprehensive approach combining cultural,
biological, mechanical, and chemical methods to manage
pests economically and environmentally
C. Eliminating all pests permanently
D. Using pesticides only when pests are visible
Answer: B
Rationale: IPM integrates multiple pest management
strategies—cultural, biological, mechanical, and
chemical—emphasizing prevention, monitoring, and
using pesticides only when necessary to minimize
economic and environmental impact.
2. What is the first step in an IPM program?
A. Apply pesticides immediately
B. Correctly identify the pest and monitor population levels
C. Remove all vegetation
D. Apply the strongest available pesticide
Answer: B
,https://www.stuvia.com/user/performance
Rationale: Correct pest identification and monitoring are
essential first steps in IPM. Misidentification can lead to
ineffective control and unnecessary pesticide use.
Monitoring determines if and when action is needed.
3. What is the "Economic Injury Level" (EIL) in IPM?
A. The point where all pests must be eliminated
B. The lowest pest population density that causes
economic damage equal to the cost of control measures
C. The point where pesticides are no longer effective
D. The maximum pest population possible
Answer: B
Rationale: The Economic Injury Level is the pest density
at which the financial loss caused by the pest equals the
cost of treatment. Below this level, control is not
economically justified.
4. What is the "Economic Threshold" (ET) in IPM?
A. The exact pest population density where control
measures must be initiated to prevent the pest from
reaching the Economic Injury Level
B. The point where all pests are dead
C. The cost of pesticides
D. The value of the crop
Answer: A
Rationale: The Economic Threshold (action threshold) is
, https://www.stuvia.com/user/performance
the pest density at which control action should be taken
to prevent the pest population from reaching the
Economic Injury Level. It is always below the EIL.
5. How does the Economic Threshold relate to the Economic
Injury Level?
A. The ET is higher than the EIL
B. The ET is set below the EIL to allow time for control
measures to work before economic damage occurs
C. They are the same
D. The ET is unrelated to the EIL
Answer: B
Rationale: The Economic Threshold is set below the
Economic Injury Level. Control actions take time to be
effective, so treatment must begin before the pest
population reaches the EIL to prevent economic loss.
6. What factors influence the Economic Threshold for a
specific pest?
A. Only pest population
B. Crop value, cost of control, pest damage potential, and
environmental conditions
C. Only weather
D. Only pesticide availability
Answer: B
Rationale: The ET varies based on crop value (higher
