Which statement about action thresholds is true?

Which statement about action thresholds is true?

• A. The action threshold for a pest may be set at a zero pest population density
• B. The IPM technician needs to implement control measures below the action threshold level
• C. In an urban landscape, action thresholds are usually more related to economics than aesthetics
• D. Both A and C

Answer: (A)

Action thresholds determine when management should begin in IPM—the pest density at which damage is likely to become unacceptable. It’s possible to set this threshold at zero, meaning even a single pest triggers control because any presence could cause harm or fail to meet aesthetic or economic goals. You don’t act below the threshold; action is taken when the threshold is reached or exceeded. In urban landscapes, thresholds are typically driven by aesthetics—the look of the area—more than purely economic costs, so the idea that thresholds are usually more related to economics isn’t generally accurate. So, the statement that the action threshold may be set at zero pest density is true.

Action thresholds determine when management should begin in IPM—the pest density at which damage is likely to become unacceptable. It’s possible to set this threshold at zero, meaning even a single pest triggers control because any presence could cause harm or fail to meet aesthetic or economic goals. You don’t act below the threshold; action is taken when the threshold is reached or exceeded. In urban landscapes, thresholds are typically driven by aesthetics—the look of the area—more than purely economic costs, so the idea that thresholds are usually more related to economics isn’t generally accurate. So, the statement that the action threshold may be set at zero pest density is true.