Which statement best defines the economic threshold in pest management for deciding whether to treat?

• A. The pest density at which control should be applied to prevent any damage.
• B. The pest density at which the expected damage equals the expected control cost, guiding decisions.
• C. The pest density that requires reporting to authorities.
• D. The pest density that maximizes yield in every field.

Answer: (B)

The economic threshold is a cost-benefit break-even point for action. It marks the pest density at which the expected crop damage from the pests equals the expected cost of applying control. When pest numbers are below this point, the cost of treatment would exceed the damage you’d prevent, so delaying treatment is economically sensible. When the density reaches or exceeds this point, taking action is justified because the damage you avert by treatment would offset, or exceed, the cost of control. This framing helps you decide when to treat to protect profit, rather than aiming for zero damage in every field or triggering action for non-economic reasons.