CPA Pesticide Formulations and Adjuvants 3

Question 1

When reading a pesticide label that states 'add 2 oz per gallon of water,' which formulation type is this language MOST typical for?

Accepted Answer

Emulsifiable concentrate (EC)

Answer

Emulsifiable concentrates are liquid formulations mixed with water at specified rates, commonly expressed as fluid ounces per gallon.

Question 2

Which adjuvant type would BEST help a systemic herbicide penetrate a waxy leaf surface?

Accepted Answer

Penetrant/activator surfactant

Answer

Penetrant surfactants (activator adjuvants) reduce surface tension and improve absorption of systemic pesticides through waxy cuticles.

Question 3

A pesticide formulated as an 'ultra-low volume (ULV)' concentrate is intended to be applied:

Accepted Answer

Undiluted or with very little dilution in very small volumes

Answer

ULV formulations are applied at very low volumes (often undiluted), typically by specialized equipment such as aerial or thermal foggers.

Question 4

Why is continuous agitation typically required when using wettable powder (WP) formulations in a spray tank?

Accepted Answer

Agitation keeps the suspended particles from settling to the bottom

Answer

Wettable powder particles do not dissolve but remain suspended; without agitation they settle, causing uneven application.

Question 5

A 'suspension concentrate' (SC or flowable) formulation is best described as:

Accepted Answer

Finely ground solid active ingredient suspended in a liquid carrier

Answer

Suspension concentrates contain finely milled solid active ingredient particles suspended in water, forming a fluid that can be poured and diluted.

(CPA) Certified Pesticide Applicator Practice Test