CPA Pesticide Types & Formulations 2 — Questions and Answers
Question 1: Which formulation type is most likely to cause phytotoxicity if improperly mixed?
- Emulsifiable concentrates (EC) (Correct answer)
- Granules (G)
- Dust (D)
- Bait (B)
Correct answer: Emulsifiable concentrates (EC)
Emulsifiable concentrates contain solvents and emulsifiers that can damage plant tissue if mixed at incorrect concentrations.
Question 2: A wettable powder (WP) differs from a soluble powder (SP) in that a wettable powder:
- Dissolves completely in water
- Remains suspended as particles in water (Correct answer)
- Requires no agitation once mixed
- Contains no active ingredient
Correct answer: Remains suspended as particles in water
Wettable powders do not dissolve but form a suspension requiring continuous agitation, unlike soluble powders that dissolve fully.
Question 3: What is the primary advantage of using a microencapsulated (ME) pesticide formulation?
- Lower cost per application
- Extended residual activity through slow release (Correct answer)
- Immediate knockdown of pests
- Eliminates the need for PPE
Correct answer: Extended residual activity through slow release
Microencapsulation surrounds the active ingredient in tiny capsules that break down slowly, extending the period of pest control.
Question 4: Which pesticide type is specifically designed to control unwanted plant species?
- Insecticide
- Fungicide
- Herbicide (Correct answer)
- Rodenticide
Correct answer: Herbicide
Herbicides are pesticides formulated to kill or suppress weeds and other unwanted vegetation.
Question 5: Ultra-low volume (ULV) formulations are typically applied at what rate compared to other liquid formulations?
- Higher volumes per acre
- The same volumes per acre
- Much lower volumes per acre (Correct answer)
- Only in enclosed spaces
Correct answer: Much lower volumes per acre
ULV formulations are applied at very low volumes (often less than 0.5 gallons per acre) as highly concentrated sprays.
Question 6: Flowable (F) or suspension concentrate (SC) formulations are best described as:
- True solutions of active ingredient in water
- Finely ground solid particles suspended in liquid (Correct answer)
- Dry granules applied without water
- Gases released from pressurized canisters
Correct answer: Finely ground solid particles suspended in liquid
Flowable/SC formulations consist of finely ground insoluble solids suspended in a liquid carrier, requiring agitation during use.
Question 7: Which formulation is most appropriate when you want to avoid spray drift in windy conditions?
- Aerosol (A)
- Dust (D)
- Granule (G) (Correct answer)
- Fumigant
Correct answer: Granule (G)
Granular formulations are heavy enough to fall to the ground quickly and are much less susceptible to wind drift than sprays or dusts.
CPA Pesticide Types & Formulations 2
Which formulation type is most likely to cause phytotoxicity if improperly mixed?