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Threshold concepts are critical in weed science as they help farmers and agronomists determine when weed control measures are necessary Action thresholds may be defined as the weed population at which a grower decides to institute a control tactic, and may be above, below, or at the economic threshold level. 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.
The concept of thresholds has many applications in weed science, depending on the response being measured In this paper we review the literature on weed thresholds and examine the theory and applicability of thresholds within the context of a systems approach to iwm. The most common adjectives used to describe thresholds are damage, economic, period, and action.
As with many terms, a threshold can be defined in a number of ways, leading to substantial confusion in the literature.
It follows that the extent to which a weed can reinfest a location will generally be determined by the size of the seed bank and so weed problems can be minimised by adopting a management program that reduces populations, particularly the seedbank.
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