ACE Safety & Handling Procedures 3 — Questions and Answers
Question 1: A pesticide label states 'Do not apply when wind speed exceeds 10 mph.' This instruction is primarily intended to prevent:
- Product degradation in the tank
- Off-target drift to non-pest areas or sensitive sites (Correct answer)
- Evaporation of the active ingredient
- Equipment corrosion
Correct answer: Off-target drift to non-pest areas or sensitive sites
Wind speed restrictions are designed to minimize pesticide drift onto non-target areas, people, water, and sensitive ecosystems.
Question 2: Which class of insecticide is most commonly associated with cholinesterase inhibition and requires specific medical monitoring for applicators?
- Pyrethroids
- Neonicotinoids
- Organophosphates and carbamates (Correct answer)
- Insect growth regulators
Correct answer: Organophosphates and carbamates
Organophosphates and carbamates inhibit acetylcholinesterase, and workers with frequent exposure may require baseline and periodic blood cholinesterase testing.
Question 3: What does 'LD50' measure in pesticide toxicology?
- The lethal dose that kills 50% of a test population (Correct answer)
- The legal dose limit for 50 kg individuals
- The lowest detected concentration in 50% of water samples
- The dose that causes 50% enzyme inhibition
Correct answer: The lethal dose that kills 50% of a test population
LD50 is the median lethal dose — the amount of a substance required to kill 50% of a test population, expressed in mg/kg body weight.
Question 4: When disposing of empty pesticide containers, which step is required by label directions before disposal?
- Incinerate the container on-site
- Triple rinse or pressure rinse the container (Correct answer)
- Return the container to the manufacturer
- Fill the container with absorbent material
Correct answer: Triple rinse or pressure rinse the container
Triple rinsing or pressure rinsing empty pesticide containers removes residues so the container can be safely recycled or disposed of in a landfill.
Question 5: An applicator notices that a pesticide formulation has separated and will not re-mix despite agitation. The BEST course of action is to:
- Apply the product at double rate to compensate
- Add a solvent to force re-mixing
- Stop use, re-read the label, and contact the manufacturer (Correct answer)
- Use the product only for outdoor applications
Correct answer: Stop use, re-read the label, and contact the manufacturer
Irreversible separation may indicate product degradation or contamination; consulting the label and manufacturer ensures safe and legal use decisions.
Question 6: Which personal protective equipment (PPE) is specifically designed to protect against pesticide absorption through the skin?
- Tyvek coveralls rated as a chemical-resistant suit (Correct answer)
- Standard cotton coveralls
- Polyester work shirt and pants
- Heavy denim clothing
Correct answer: Tyvek coveralls rated as a chemical-resistant suit
Chemical-resistant suits (e.g., Tyvek with appropriate barrier rating) are specifically tested and rated to resist pesticide penetration through the skin.
Question 7: Under OSHA's Hazard Communication Standard (HazCom), employers must provide workers with access to Safety Data Sheets:
- Only upon written employee request
- During all working hours (Correct answer)
- Only when a spill or accident occurs
- At the time of annual safety training only
Correct answer: During all working hours
OSHA's HazCom Standard requires that SDSs be readily accessible to employees during all work shifts, not just on request or during emergencies.
ACE Safety & Handling Procedures 3
A pesticide label states 'Do not apply when wind speed exceeds 10 mph.' This instruction is primarily intended to prevent: