CPA CPA - Certified Pesticide Applicator Pesticide Resistance Management Questions and Answers 1

Question 1

Pesticide resistance is BEST defined as:

Accepted Answer

A heritable trait in a pest population that reduces the effectiveness of a pesticide

Answer

Resistance is a genetic, heritable change in a pest population that makes individuals survive exposures that would kill susceptible individuals.

Question 2

Which pest management practice is MOST effective at slowing the development of pesticide resistance?

Accepted Answer

Rotating pesticide mode-of-action (MOA) classes

Answer

Rotating between pesticides with different modes of action prevents continuous selection pressure on any single mechanism, slowing resistance development.

Question 3

What is a 'mode of action' (MOA) in pesticide terminology?

Accepted Answer

The specific biochemical or physiological process in a pest that a pesticide disrupts

Answer

Mode of action describes the specific biological target or mechanism—such as acetylcholinesterase inhibition—by which a pesticide kills or controls a pest.

Question 4

Which of the following is a sign that a pest population may have developed resistance to a pesticide?

Accepted Answer

Normal application rates fail to provide expected levels of control over time

Answer

When labeled rates that previously worked begin to fail repeatedly and consistently, resistance in the population is a likely explanation.

Question 5

IRAC (Insecticide Resistance Action Committee) group numbers on pesticide labels help applicators:

Accepted Answer

Identify the mode of action and rotate between different groups to manage resistance

Answer

IRAC numbers classify insecticides by mode of action so applicators can deliberately rotate between groups and avoid selecting for cross-resistance.

(CPA) Certified Pesticide Applicator Practice Test

(CPA) Certified Pesticide Applicator Practice Test

CPA CPA - Certified Pesticide Applicator Pesticide Resistance Management Questions and Answers 1