This level of injury occurs before economic loss. Expressed in terms of yield, economic loss is reached at the gain threshold, and the gain threshold is beyond the damage boundary. For high value commodities, the damage boundary may be very close to the gain threshold.
Economic threshold. The pest density at which management action should be taken to prevent an increasing pest population from reaching the economic injury level."
Economic thresholds can be expressed in a variety of ways including the number of insects per plant or per square metre, the amount of leaf surface damage, etc. In many cases, thresholds have been established through scientific research.
What is an Economic Threshold (Action Threshold)? In 1959, entomologists came up with definitions for concepts that had been used in pest control for many years.
The thresholds presented here are economic thresholds, in which the density of a pest has reached a point at which a management intervention (in this case a pesticide application) is economically justified. An economic threshold should not be confused with the economic injury level.
Thus, “Economic Threshold” linguistically signifies the ‘financial limit’ or ‘cost-based point of entry’ for action. Its adoption in IPM cemented this meaning → the pest population level at which the economic loss likely to be caused by the pest meets or exceeds the economic cost of controlling it.
Thresholds are based on considerable amounts of research and/or field experience. If the economic threshold is approached, but not reached, do not apply a pesticide at that time. Instead, re-scout the field within a few days to determine the status of the infestation.
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