CPA Environmental Impact & Regulations 3 — Questions and Answers
Question 1: Which document must an applicator consult to determine the required pre-harvest interval (PHI) before treating a food crop?
- The pesticide product label (Correct answer)
- The state department of agriculture website
- The Material Safety Data Sheet (SDS)
- The EPA tolerance database
Correct answer: The pesticide product label
The product label specifies the pre-harvest interval, which is a legally binding restriction on when treated crops may be harvested.
Question 2: Integrated Pest Management (IPM) reduces environmental impact primarily by:
- Using pesticides as a last resort after other control methods have been evaluated (Correct answer)
- Eliminating all pesticide use on managed sites
- Applying broad-spectrum pesticides on a preventive schedule
- Relying exclusively on biological control organisms
Correct answer: Using pesticides as a last resort after other control methods have been evaluated
IPM minimizes pesticide use by combining cultural, biological, mechanical, and chemical tactics, using chemicals only when thresholds are exceeded.
Question 3: Spray drift is most likely to increase under which weather condition?
- Low wind speeds with high temperature inversion (Correct answer)
- Calm winds with moderate humidity
- High relative humidity with wind speeds above 15 mph
- Stable air with light winds at 3–5 mph
Correct answer: Low wind speeds with high temperature inversion
Temperature inversions trap fine droplets near the ground, allowing them to drift horizontally for long distances even in light air.
Question 4: Which federal agency is responsible for enforcing pesticide residue violations on food in interstate commerce?
- Food and Drug Administration (FDA) (Correct answer)
- Environmental Protection Agency (EPA)
- United States Department of Agriculture (USDA)
- Occupational Safety and Health Administration (OSHA)
Correct answer: Food and Drug Administration (FDA)
The FDA enforces pesticide residue tolerances on most domestic and imported foods, while USDA covers meat, poultry, and egg products.
Question 5: An applicator notices bees foraging on a crop scheduled for pesticide treatment. The best course of action is to:
- Delay the application until bees are not actively foraging, typically at dusk or dawn (Correct answer)
- Apply immediately at a reduced rate to minimize bee contact
- Switch to a systemic insecticide to reduce surface exposure
- Notify the state and apply anyway if the label does not mention bees
Correct answer: Delay the application until bees are not actively foraging, typically at dusk or dawn
Applying when bees are not foraging (early morning or evening) greatly reduces pollinator exposure and mortality.
Question 6: The Clean Water Act's National Pollutant Discharge Elimination System (NPDES) requires a permit for pesticide applications that:
- Discharge pesticides directly to navigable waters or their adjacent wetlands (Correct answer)
- Are applied to dry land more than 100 feet from any water body
- Involve only EPA-approved biological pesticides
- Are conducted by private landowners on their own property
Correct answer: Discharge pesticides directly to navigable waters or their adjacent wetlands
The NPDES Pesticide General Permit is required when applying pesticides directly to or over navigable waters and wetlands.
Question 7: Which of the following best describes the concept of 'resistance management' in pesticide regulation?
- Rotating between pesticides with different modes of action to prevent pest populations from developing immunity (Correct answer)
- Increasing application rates to overcome resistant pest strains
- Using pesticides with the longest residual activity available
- Applying pesticides before resistance is detected in field populations
Correct answer: Rotating between pesticides with different modes of action to prevent pest populations from developing immunity
Rotating modes of action prevents selection pressure that leads to resistant pest populations, preserving chemical efficacy long-term.
CPA Environmental Impact & Regulations 3
Which document must an applicator consult to determine the required pre-harvest interval (PHI) before treating a food crop?