CPA - Certified Pesticide Applicator Pesticide Resistance Management Questions and Answers Flashcards
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Read the first 6 CPA - Certified Pesticide Applicator Pesticide Resistance Management Questions and Answers flashcards as text
Which of the following resistance mechanisms involves a pest detoxifying a pesticide before it reaches its target site?
Answer: Metabolic resistance
Metabolic resistance occurs when the pest has elevated levels of detoxifying enzymes that break down the pesticide, reducing the amount reaching the target site.
An applicator notices that the same herbicide applied at label rates is no longer controlling a weed species that it previously controlled well. The FIRST recommended step is to:
Answer: Confirm correct identification of the weed and rule out application errors before concluding resistance
Application failures can result from wrong identification, incorrect rate, poor timing, or equipment issues; resistance should only be concluded after ruling out these factors.
Which herbicide resistance classification group system do applicators use to guide MOA rotation decisions?
Answer: WSSA (Weed Science Society of America) MOA group numbers
WSSA assigns numeric MOA group codes to herbicides, enabling applicators to rotate between groups and prevent selecting for herbicide-resistant weed biotypes.
Which strategy BEST reduces selection pressure for insecticide resistance in a high-value crop?
Answer: Applying insecticides only when action thresholds are exceeded and rotating MOA classes between applications
Threshold-based applications reduce total selection pressure, and MOA rotation prevents any single mechanism from being continuously targeted.
What is 'refuge' strategy in resistance management for Bt transgenic crops?
Answer: Planting non-Bt crop areas near Bt crops to maintain a population of susceptible insects
Refuge plantings provide susceptible insects that mate with any rare resistant individuals, diluting resistance genes and slowing resistance development in the overall pest population.
Multiple resistance in a pest population means that the population:
Answer: Has resistance mechanisms to two or more pesticide classes with different modes of action
Multiple resistance occurs when a pest has accumulated resistance mechanisms to several different MOA classes, severely limiting control options.