Economic threshold is defined as which of the following?

Economic threshold is defined as which of the following?

• A. The pest density level when management measures must be applied to prevent reaching the economic injury level
• B. The economic value of the crop
• C. The pest density after which no control is needed
• D. The density for aesthetic damage

Answer: (A)

The main idea is timing of action. Economic threshold is the pest density at which you should start management to keep the population from reaching a level where crop losses become economically significant. It’s a proactive trigger that’s set below the economic injury level so there’s time to apply control and still protect profitability. To connect the pieces, the economic injury level is where the value of the expected crop loss equals the cost of control; the threshold is deliberately lower, providing a buffer to account for treatment delays, pest movement, and variability in control effectiveness. This threshold is influenced by factors like crop value, potential yield loss, and the anticipated performance and cost of the control method. So, the correct concept describes a density at which you must act to prevent reaching economic injury, rather than describing crop value itself, a point after which no control is needed, or cosmetic damage.

The main idea is timing of action. Economic threshold is the pest density at which you should start management to keep the population from reaching a level where crop losses become economically significant. It’s a proactive trigger that’s set below the economic injury level so there’s time to apply control and still protect profitability.

To connect the pieces, the economic injury level is where the value of the expected crop loss equals the cost of control; the threshold is deliberately lower, providing a buffer to account for treatment delays, pest movement, and variability in control effectiveness. This threshold is influenced by factors like crop value, potential yield loss, and the anticipated performance and cost of the control method.

So, the correct concept describes a density at which you must act to prevent reaching economic injury, rather than describing crop value itself, a point after which no control is needed, or cosmetic damage.