CPA Pesticide Types & Formulations 3 — Questions and Answers
Question 1: A pesticide label states the formulation is an 'EC.' What does this abbreviation stand for?
- Encapsulated Compound
- Emulsifiable Concentrate (Correct answer)
- Extended Coverage
- Environmental Control
Correct answer: Emulsifiable Concentrate
EC stands for Emulsifiable Concentrate, a formulation in which the active ingredient is dissolved in an organic solvent with an emulsifier added.
Question 2: Which class of pesticide is used primarily to control fungal diseases on crops?
- Nematicide
- Fungicide (Correct answer)
- Acaricide
- Avicide
Correct answer: Fungicide
Fungicides are pesticides that inhibit or kill fungi, protecting crops from diseases like blight, mildew, and rust.
Question 3: What is a key disadvantage of dust (D) formulations compared to liquid sprays?
- Dusts cannot be used outdoors
- Dusts are highly prone to drift and off-target movement (Correct answer)
- Dusts require special mixing equipment
- Dusts are not registered for any crop use
Correct answer: Dusts are highly prone to drift and off-target movement
The fine particles in dust formulations are very light and easily carried by wind, making precise application difficult and increasing off-target risks.
Question 4: Systemic pesticides are unique because they:
- Kill pests on contact only
- Are absorbed and move through the plant's vascular system (Correct answer)
- Must be applied directly to pest insects
- Break down within 24 hours of application
Correct answer: Are absorbed and move through the plant's vascular system
Systemic pesticides are taken up by the plant and translocated through its tissues, making all parts of the plant toxic to pests.
Question 5: Which fumigant application method involves covering treated soil with a tarp after application?
- Broadcast spray
- Soil incorporation
- Tarped fumigation (Correct answer)
- Granular band treatment
Correct answer: Tarped fumigation
Tarped fumigation retains the gaseous fumigant in the soil by sealing it under a tarp, increasing efficacy and reducing atmospheric escape.
Question 6: Adjuvants are added to pesticide formulations or tank mixes primarily to:
- Increase the toxicity of the active ingredient
- Improve application characteristics such as spreading, sticking, or penetration (Correct answer)
- Replace the active ingredient when supplies are low
- Satisfy EPA registration requirements
Correct answer: Improve application characteristics such as spreading, sticking, or penetration
Adjuvants enhance the performance of pesticide applications by improving coverage, adhesion, or uptake without being pesticides themselves.
Question 7: Rodenticides used in bait formulations are categorized as which type of pesticide based on their target pest?
- Avicide
- Molluscicide
- Rodenticide (Correct answer)
- Predacide
Correct answer: Rodenticide
Rodenticides are pesticides specifically designed to kill rodents such as mice, rats, and voles.
CPA Pesticide Types & Formulations 3
A pesticide label states the formulation is an 'EC.' What does this abbreviation stand for?