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programs identify acceptable pest levels or action thresholds based on estimated economic injury, and apply controls if those thresholds are exceeded. An economic injury level is the pest population level at which damage to a crop will be greater than the cost of treating the pest. An economic threshold is the population size at which action must be taken to prevent the pest population from reaching the economic injury level.Thresholds are pest and site specific, meaning that it may be acceptable to have a weed such at one site, but not at another

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