Weed density per square foot, expected yield loss percentage, and control cost versus crop value. However, adoption of the threshold concept has spurred the development of decision models and use of methods of decision analysis. There are several types of thresholds used in weed science, including The density of weeds at which the cost of control equals the value of the crop loss prevented by control. The pest density at which management action should be taken to prevent an increasing pest population from reaching the economic injury level. Damage threshold is the term used to define the weed population at which a negative crop yield response is detected
An economic threshold is the weed population at which the cost of control is equal to the crop value increase from control of the weeds present.
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