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The et is the density of weeds at which the cost of control equals the benefits obtained under particular weed control measure adopted. The pest density at which management action should be taken to prevent an increasing pest population from reaching the economic injury level. Iowa state university extension defines the economic threshold as the weed density where the cost of control equals the value of crop yield saved
Successful implementation requires accurate weed identification and counting. The concept of thresholds has many applications in weed science, depending on the response being measured, and implies that weed effects are population dependent, and allow some type of prediction to be made relative to the consequences of control decisions. However, adoption of the threshold concept has spurred the development of decision models and use of methods of decision analysis.
Threshold concepts are critical in weed science as they help farmers and agronomists determine when weed control measures are necessary
The concept of thresholds is based on the idea that there is a certain level of weed infestation beyond which crop yields are significantly impacted. 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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