Weed density per square foot, expected yield loss percentage, and control cost versus crop value. 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 study found that $50 million is spent annually to control the eleven weeds in group 1 and that the nine weeds in group 2 threaten over one thousand special conservation areas. An economic threshold (et) is defined as ‘the pest population likely to cause damage equal in value to the cost of control (pesticide plus application).’ such a population is known as the ‘critical’ or ‘break even’ population.
The pest density at which management action should be taken to prevent an increasing pest population from reaching the economic injury level.
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