CPA Pesticide Types & Formulations

Question 1

What is the primary difference between selective and non-selective herbicides?

Accepted Answer

Answer

Selective herbicides are specifically designed to control certain types of plants (e.g., broadleaf weeds) while leaving others unharmed (e.g., desirable grasses). In contrast, non-selective herbicides are formulated to kill or severely injure most plant vegetation they contact, making them suitable for total vegetation control in non-crop areas where all plant growth is unwanted.

Question 2

Which pesticide formulation is best suited for applying to large areas of grass or field crops?

Accepted Answer

Answer

Liquid spray formulations are highly versatile and widely used for large-area applications due to their ability to be evenly distributed over vast surfaces using various spray equipment, such as boom sprayers. They allow for precise control of application rates and coverage, making them efficient and effective for treating extensive field crops and large grassy areas.

Question 3

How do systemic pesticides work?

Accepted Answer

Answer

Systemic pesticides are absorbed by the target organism, such as a plant, and then translocated throughout its tissues via the vascular system. This internal distribution means that pests feeding on or living within the treated organism will ingest the pesticide, providing protection even against hidden or hard-to-reach pests that might not be directly contacted by a spray.

Question 4

What is the advantage of using microencapsulated pesticides?

Accepted Answer

Answer

Microencapsulated pesticides consist of tiny capsules containing the active ingredient, which are designed to release the pesticide slowly over an extended period. This controlled-release mechanism provides a significant advantage by offering prolonged residual activity, reducing the frequency of applications, and delivering longer-lasting pest control with fewer treatments.

Question 5

What is the main benefit of using a contact pesticide?

Accepted Answer

Answer

Contact pesticides work by directly touching the pest, causing immediate harm or death upon contact with their body. Their main benefit is rapid knockdown, providing quick control of visible pest populations. However, they generally do not offer long-lasting residual protection once the initial application has dried or dissipated, requiring precise application to hit the target pest.

(CPA) Certified Pesticide Applicator Practice Test

(CPA) Certified Pesticide Applicator Practice Test

CPA Pesticide Types & Formulations